Fair Value Measurements (Tables)
   | 
9 Months Ended | 
Sep. 30, 2015  | 
| Fair Value Disclosures [Abstract] | 
 
 | 
| Assets and Liabilities Measured at Fair Value on Recurring Basis | 
As of September 30, 2015 and December 31, 2014, assets and liabilities measured at fair value on a recurring basis are as follows:
 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Level 1  | 
   | 
Level 2  | 
   | 
Level 3  | 
   | 
   | 
 
   | 
 Quoted Prices in 
Active Markets 
for Identical 
Assets 
 | 
   | 
 Significant 
Observable 
Inputs with No 
Active Market 
with Identical 
Characteristics 
 | 
   | 
 Significant 
Unobservable 
Inputs 
 | 
   | 
Balance  | 
 
   | 
(in thousands)  | 
 
September 30, 2015  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Securities available for sale:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Mortgage-backed securities  | 
$  | 
—  | 
 
  | 
   | 
$  | 
324,504  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
324,504  | 
 
  | 
 
Collateralized mortgage obligations  | 
—  | 
 
  | 
   | 
116,314  | 
 
  | 
   | 
—  | 
 
  | 
   | 
116,314  | 
 
  | 
 
U.S. government agency securities  | 
—  | 
 
  | 
   | 
57,674  | 
 
  | 
   | 
—  | 
 
  | 
   | 
57,674  | 
 
  | 
 
SBA loan pools securities  | 
—  | 
 
  | 
   | 
68,301  | 
 
  | 
   | 
—  | 
 
  | 
   | 
68,301  | 
 
  | 
 
Municipal bonds-tax exempt  | 
—  | 
 
  | 
   | 
48,001  | 
 
  | 
   | 
—  | 
 
  | 
   | 
48,001  | 
 
  | 
 
Municipal bonds-taxable  | 
—  | 
 
  | 
   | 
14,372  | 
 
  | 
   | 
—  | 
 
  | 
   | 
14,372  | 
 
  | 
 
Corporate bonds  | 
—  | 
 
  | 
   | 
17,005  | 
 
  | 
   | 
—  | 
 
  | 
   | 
17,005  | 
 
  | 
 
U.S. treasury securities  | 
162  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
162  | 
 
  | 
 
Other securities  | 
23,007  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
23,007  | 
 
  | 
 
Total securities available for sale  | 
$  | 
23,169  | 
 
  | 
   | 
$  | 
646,171  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
669,340  | 
 
  | 
 
December 31, 2014  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Securities available for sale:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Mortgage-backed securities  | 
$  | 
—  | 
 
  | 
   | 
$  | 
573,286  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
573,286  | 
 
  | 
 
Collateralized mortgage obligations  | 
—  | 
 
  | 
   | 
188,047  | 
 
  | 
   | 
—  | 
 
  | 
   | 
188,047  | 
 
  | 
 
U.S. government agency securities (1)
  | 
—  | 
 
  | 
   | 
128,207  | 
 
  | 
   | 
—  | 
 
  | 
   | 
128,207  | 
 
  | 
 
SBA loan pools securities  | 
—  | 
 
  | 
   | 
109,447  | 
 
  | 
   | 
—  | 
 
  | 
   | 
109,447  | 
 
  | 
 
Municipal bonds-tax exempt  | 
—  | 
 
  | 
   | 
3,681  | 
 
  | 
   | 
709  | 
 
  | 
   | 
4,390  | 
 
  | 
 
Municipal bonds-taxable  | 
—  | 
 
  | 
   | 
16,922  | 
 
  | 
   | 
—  | 
 
  | 
   | 
16,922  | 
 
  | 
 
Corporate bonds  | 
—  | 
 
  | 
   | 
16,948  | 
 
  | 
   | 
—  | 
 
  | 
   | 
16,948  | 
 
  | 
 
U.S. treasury securities  | 
163  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
163  | 
 
  | 
 
Other securities (2)
  | 
22,893  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
22,893  | 
 
  | 
 
Equity securities  | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
414  | 
 
  | 
   | 
414  | 
 
  | 
 
Total securities available for sale  | 
$  | 
23,056  | 
 
  | 
   | 
$  | 
1,036,538  | 
 
  | 
   | 
$  | 
1,123  | 
 
  | 
   | 
$  | 
1,060,717  | 
 
  | 
 
  
                                
 
 | 
 | 
 
(1)   | 
U.S. government agency securities of $128.2 million were reclassified as level 2 rather than level 1 as originally classified due to significant other observable inputs other than quoted prices for identical assets in active markets. 
  | 
 
 
 | 
 | 
 
(2)   | 
Other securities of $22.9 million were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets of the holdings. 
  | 
 
 
  
 
 | 
| Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities | 
The table below presents a reconciliation and income statement classification of gains and losses for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30, 2015:
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Beginning Balance as of January 1, 2015  | 
   | 
 Purchases, 
Issuances 
and 
Settlement 
 | 
   | 
 Realized 
Gains or 
(Losses) 
in Earnings 
 | 
   | 
 Unrealized 
Gains or 
Losses 
in Other 
Comprehensive 
Income 
 | 
   | 
Ending Balance as of September 30, 2015  | 
 
   | 
(in thousands)  | 
 
Assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Municipal bonds-tax exempt (1)
  | 
$  | 
709  | 
 
  | 
   | 
$  | 
(709  | 
)  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
 
Equity securities (2)
  | 
$  | 
414  | 
 
  | 
   | 
$  | 
(339  | 
)  | 
   | 
$  | 
(75  | 
)  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
 
  
 
                                
 
 | 
 | 
 
(1)   | 
A zero coupon tax credit municipal bond matured during the first quarter of 2015.  | 
 
 
 | 
 | 
 
(2)   | 
Reflects two equity securities that were not actively traded. During the second quarter of 2015, one equity security with a book value of $200,000 with a fair value of $200,000 as of December 31, 2014 was sold at $75,000 loss and the other equity security with a book value of $250,000 with a fair value of $214,000 as of December 31, 2014 was reclassified to other assets. 
  | 
 
 
 
 | 
| Assets and Liabilities Measured at Fair Value on Non-Recurring Basis | 
As of September 30, 2015 and December 31, 2014, assets and liabilities measured at fair value on a non-recurring basis are as follows:
 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Level 1  | 
   | 
Level 2  | 
   | 
Level 3  | 
   | 
   | 
 
   | 
 Quoted Prices in 
Active Markets 
for Identical 
Assets 
 | 
   | 
 Significant 
Observable 
Inputs With No 
Active Market 
With Identical 
Characteristics 
 | 
   | 
 Significant 
Unobservable 
Inputs 
 | 
   | 
Loss During the nine Months Ended September 30, 2015  | 
 
   | 
(in thousands)  | 
 
September 30, 2015  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Impaired loans (excluding PCI loans) (1)
  | 
$  | 
—  | 
 
  | 
   | 
$  | 
24,794  | 
 
  | 
   | 
$  | 
1,202  | 
 
  | 
   | 
$  | 
1,985  | 
 
  | 
 
OREO (2)
  | 
$  | 
—  | 
 
  | 
   | 
$  | 
13,249  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
444  | 
 
  | 
 
   | 
Level 1  | 
   | 
Level 2  | 
   | 
Level 3  | 
   | 
   | 
 
   | 
Quoted Prices in Active Markets for Identical Assets  | 
   | 
Significant Observable Inputs With No Active Market With Identical Characteristics  | 
   | 
Significant Unobservable Inputs  | 
   | 
Loss During the Twelve Months Ended December 31, 2014  | 
 
   | 
(in thousands)  | 
 
December 31, 2014  | 
   | 
   | 
   | 
 
Assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Impaired loans (excluding PCI loans) (3)
  | 
$  | 
—  | 
 
  | 
   | 
$  | 
32,171  | 
 
  | 
   | 
$  | 
781  | 
 
  | 
   | 
$  | 
2,774  | 
 
  | 
 
OREO (4)
  | 
$  | 
—  | 
 
  | 
   | 
$  | 
15,790  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
 
  
                               
 
 | 
 | 
 
(1)   | 
Consists of real estate loans of $23.4 million, commercial and industrial loans of $896,000, and consumer loans of $1.7 million.
  | 
 
 
 | 
 | 
 
(2)   | 
Consists of properties obtained from the foreclosure of commercial property loans of $11.5 million and residential property loans of $1.7 million.
  | 
 
 
 | 
 | 
 
(3)   | 
Consists of real estate loans of $30.0 million, commercial and industrial loans of $1.2 million and consumer loans of $1.7 million.
  | 
 
 
 | 
 | 
 
(4)   | 
Consists of properties obtained from the foreclosure of commercial property loans of $13.2 million and residential property loans of $2.6 million.
  | 
 
 
 
 | 
| Estimated Fair Values of Financial Instruments | 
The estimated fair values of financial instruments were as follows: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
September 30, 2015  | 
 
   | 
Carrying  | 
   | 
Fair Value  | 
 
   | 
Amount  | 
   | 
Level 1  | 
   | 
Level 2  | 
   | 
Level 3  | 
 
   | 
(in thousands)  | 
 
Financial assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and due from banks  | 
$  | 
235,342  | 
 
  | 
   | 
$  | 
235,342  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
 
Securities available for sale  | 
669,340  | 
 
  | 
   | 
23,169  | 
 
  | 
   | 
646,171  | 
 
  | 
   | 
—  | 
 
  | 
 
Loans receivable, net of allowance for loan losses  | 
2,998,712  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
3,006,747  | 
 
  | 
 
Loans held for sale  | 
4,871  | 
 
  | 
   | 
—  | 
 
  | 
   | 
4,871  | 
 
  | 
   | 
—  | 
 
  | 
 
Accrued interest receivable  | 
8,722  | 
 
  | 
   | 
8,722  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
 
Servicing assets  | 
11,986  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
11,986  | 
 
  | 
 
FHLB stock  | 
16,385  | 
 
  | 
   | 
—  | 
 
  | 
   | 
16,385  | 
 
  | 
   | 
—  | 
 
  | 
 
FRB stock  | 
14,098  | 
 
  | 
   | 
—  | 
 
  | 
   | 
14,098  | 
 
  | 
   | 
—  | 
 
  | 
 
Financial liabilities:  | 
 
  | 
 
  | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Noninterest-bearing deposits  | 
1,114,621  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,114,621  | 
 
  | 
   | 
—  | 
 
  | 
 
Interest-bearing deposits  | 
2,404,073  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
2,404,110  | 
 
  | 
 
Servicing liabilities  | 
5,176  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
5,176  | 
 
  | 
 
Borrowings  | 
168,669  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
168,669  | 
 
  | 
 
Accrued interest payable  | 
2,985  | 
 
  | 
   | 
2,985  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
 
Off-balance sheet items:  | 
 
  | 
 
  | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Commitments to extend credit  | 
314,303  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
314,303  | 
 
  | 
 
Standby letters of credit  | 
5,603  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
5,603  | 
 
  | 
 
  
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
December 31, 2014  | 
 
   | 
Carrying  | 
   | 
Fair Value  | 
 
   | 
Amount  | 
   | 
Level 1  | 
   | 
Level 2  | 
   | 
Level 3  | 
 
   | 
(in thousands)  | 
 
Financial assets:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Cash and due from banks  | 
$  | 
158,320  | 
 
  | 
   | 
$  | 
158,320  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
 
Securities available for sale (1)
  | 
1,060,717  | 
 
  | 
   | 
23,056  | 
 
  | 
   | 
1,036,538  | 
 
  | 
   | 
1,123  | 
 
  | 
 
Loans receivable, net of allowance for loan losses  | 
2,735,832  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
2,738,401  | 
 
  | 
 
Loans held for sale  | 
5,451  | 
 
  | 
   | 
—  | 
 
  | 
   | 
5,451  | 
 
  | 
   | 
—  | 
 
  | 
 
Accrued interest receivable  | 
9,749  | 
 
  | 
   | 
9,749  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
 
Servicing assets  | 
13,773  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
13,773  | 
 
  | 
 
FHLB stock  | 
17,580  | 
 
  | 
   | 
—  | 
 
  | 
   | 
17,580  | 
 
  | 
   | 
—  | 
 
  | 
 
FRB stock  | 
12,273  | 
 
  | 
   | 
—  | 
 
  | 
   | 
12,273  | 
 
  | 
   | 
—  | 
 
  | 
 
Financial liabilities:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Noninterest-bearing deposits  | 
1,022,972  | 
 
  | 
   | 
—  | 
 
  | 
   | 
1,022,972  | 
 
  | 
   | 
—  | 
 
  | 
 
Interest-bearing deposits  | 
2,533,774  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
2,528,304  | 
 
  | 
 
Servicing liabilities  | 
5,971  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
5,971  | 
 
  | 
 
Borrowings  | 
168,544  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
149,983  | 
 
  | 
 
Accrued interest payable  | 
3,450  | 
 
  | 
   | 
3,450  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
 
Off-balance sheet items:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Commitments to extend credit  | 
309,584  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
309,584  | 
 
  | 
 
Standby letters of credit  | 
8,982  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
8,982  | 
 
  | 
 
  
                                
 
 | 
 | 
 
(1)   | 
Level 1 and Level 2 previously reported as $128.4 million and $931.2 million, respectively. U.S. government agency securities of $128.2 million were reclassified as Level 2 rather than Level 1 as originally classified due to significant other observable inputs other than quoted prices for identical assets in active markets. Other securities of $22.9 million were reclassified as Level 1 rather than Level 2 as originally classified due to the availability of quoted prices in active markets of the holdings. 
  | 
 
 
  
 
 |