Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.6
Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 413,132 $ 443,712
Gross Unrealized Gain 8,283 8,287
Gross Unrealized Loss 1,512 939
Estimated Fair Value 419,903 451,060
Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 146,889 157,185
Gross Unrealized Gain 3,008 3,327
Gross Unrealized Loss 503 186
Estimated Fair Value 149,394 160,326
Collateralized Mortgage Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 90,972 98,821
Gross Unrealized Gain 2,081 1,775
Gross Unrealized Loss 185 109
Estimated Fair Value 92,868 100,487
U.S. Government Agency Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 80,991 92,990
Gross Unrealized Gain 116 222
Gross Unrealized Loss 177 94
Estimated Fair Value 80,930 93,118
Municipal Bonds-Tax Exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,185 12,209
Gross Unrealized Gain 526 603
Gross Unrealized Loss     
Estimated Fair Value 12,711 12,812
Municipal Bonds-Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 44,159 44,248
Gross Unrealized Gain 2,124 2,029
Gross Unrealized Loss 127 135
Estimated Fair Value 46,156 46,142
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 20,473 20,470
Gross Unrealized Gain 200 176
Gross Unrealized Loss 301 246
Estimated Fair Value 20,372 20,400
SBA Loan Pool Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 14,084 14,104
Gross Unrealized Gain   4
Gross Unrealized Loss 166 82
Estimated Fair Value 13,918 14,026
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,025 3,331
Gross Unrealized Gain 58 73
Gross Unrealized Loss 53 47
Estimated Fair Value 3,030 3,357
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 354 354
Gross Unrealized Gain 170 78
Gross Unrealized Loss   40
Estimated Fair Value $ 524 $ 392