Quarterly report pursuant to Section 13 or 15(d)

Summary of Investment Securities Available for Sale (Detail)

v2.4.0.6
Summary of Investment Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 402,978 $ 377,747
Gross Unrealized Gain 8,169 5,097
Gross Unrealized Loss 937 982
Estimated Fair Value 410,210 381,862
Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 138,173 [1] 110,433 [1]
Gross Unrealized Gain 3,996 [1] 2,573 [1]
Gross Unrealized Loss 1 [1] 1 [1]
Estimated Fair Value 142,168 [1] 113,005 [1]
Collateralized Mortgage Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 100,125 [1] 161,214 [1]
Gross Unrealized Gain 1,296 [1] 1,883 [1]
Gross Unrealized Loss 31 [1] 260 [1]
Estimated Fair Value 101,390 [1] 162,837 [1]
U.S. Government Agencies Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 79,027 72,385
Gross Unrealized Gain 185 168
Gross Unrealized Loss 48 5
Estimated Fair Value 79,164 72,548
Municipal Bonds-Tax Exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,232 3,389
Gross Unrealized Gain 506 93
Estimated Fair Value 12,738 3,482
Municipal Bonds - Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 44,336 5,901
Gross Unrealized Gain 2,025 237
Gross Unrealized Loss 127  
Estimated Fair Value 46,234 6,138
Corporate Bond Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 20,467 20,460
Gross Unrealized Gain 62  
Gross Unrealized Loss 632 624
Estimated Fair Value 19,897 19,836
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 8,264 3,318
Gross Unrealized Gain 99 58
Gross Unrealized Loss 35 41
Estimated Fair Value 8,328 3,335
Total Equity Securities Available For Sale [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 354 647
Gross Unrealized Gain   85
Gross Unrealized Loss 63 51
Estimated Fair Value $ 291 $ 681
[1] Collateralized by residential mortgages and guaranteed by U.S. government sponsored entities