Quarterly report pursuant to Section 13 or 15(d)

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

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Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 399,900 $ 443,712
Gross Unrealized Gain 5,470 8,287
Gross Unrealized Loss 4,555 939
Estimated Fair Value 400,815 451,060
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 125,177 157,185
Gross Unrealized Gain 1,312 3,327
Gross Unrealized Loss 1,871 186
Estimated Fair Value 124,618 160,326
Collateralized mortgage obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 83,955 98,821
Gross Unrealized Gain 1,414 1,775
Gross Unrealized Loss 521 109
Estimated Fair Value 84,848 100,487
U.S. government agency securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 98,853 92,990
Gross Unrealized Gain 18 222
Gross Unrealized Loss 1,267 94
Estimated Fair Value 97,604 93,118
Municipal bonds-tax exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,166 12,209
Gross Unrealized Gain 485 603
Estimated Fair Value 10,651 12,812
Municipal bonds-taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 44,053 44,248
Gross Unrealized Gain 1,679 2,029
Gross Unrealized Loss 186 135
Estimated Fair Value 45,546 46,142
Corporate bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 20,475 20,470
Gross Unrealized Gain 176 176
Gross Unrealized Loss 276 246
Estimated Fair Value 20,375 20,400
SBA Loan Pool Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,842 14,104
Gross Unrealized Gain   4
Gross Unrealized Loss 341 82
Estimated Fair Value 13,501 14,026
Other securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,025 3,331
Gross Unrealized Gain 1 73
Gross Unrealized Loss 93 47
Estimated Fair Value 2,933 3,357
Equity securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 354 354
Gross Unrealized Gain 385 78
Gross Unrealized Loss   40
Estimated Fair Value $ 739 $ 392