Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Summary of Investment Securities Available for Sale (Detail)

v2.4.0.8
Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 532,501 $ 549,113
Gross Unrealized Gain 459 782
Gross Unrealized Loss 11,970 18,969
Estimated Fair Value 520,990 530,926
Collateralized mortgage obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 149,269 130,636
Gross Unrealized Gain 123 274
Gross Unrealized Loss 1,361 3,217
Estimated Fair Value 148,031 127,693
Municipal bonds-tax exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,365 13,857
Gross Unrealized Gain 67 110
Gross Unrealized Loss    30
Estimated Fair Value 4,432 13,937
Municipal bonds-taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 22,036 33,361
Gross Unrealized Gain 160 73
Gross Unrealized Loss 521 1,080
Estimated Fair Value 21,675 32,354
Corporate bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 21,014 21,013
Gross Unrealized Gain 20 8
Gross Unrealized Loss 128 186
Estimated Fair Value 20,906 20,835
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 228,363 222,768
Gross Unrealized Gain 86 317
Gross Unrealized Loss 4,084 6,026
Estimated Fair Value 224,365 217,059
U.S. government agency securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 90,855 90,852
Gross Unrealized Gain 3   
Gross Unrealized Loss 4,880 7,316
Estimated Fair Value 85,978 83,536
SBA loan pool securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,569 13,598
Gross Unrealized Gain     
Gross Unrealized Loss 867 969
Estimated Fair Value 12,702 12,629
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,030 3,030
Gross Unrealized Gain     
Gross Unrealized Loss 129 144
Estimated Fair Value 2,901 2,886
U.S. treasury bills [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   19,998
Gross Unrealized Gain     
Gross Unrealized Loss   1
Estimated Fair Value   $ 19,997