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Securities - Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 697,738 $ 712,637
Unrealized Gains 9,827 28,181
Unrealized Losses (21,574) (3,507)
Fair Value 685,991 737,311
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0 4,018
Unrealized Gains 0 18
Unrealized Losses 0 0
Fair Value 0 4,036
U.S. Government Sponsored Entities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 185,205 157,965
Unrealized Gains 2,894 5,977
Unrealized Losses (6,474) (161)
Fair Value 181,625 163,781
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 176,490 170,223
Unrealized Gains 3,770 11,113
Unrealized Losses (2,317) (57)
Fair Value 177,943 181,279
Residential and Multi-Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 248,017 308,800
Unrealized Gains 2,410 8,724
Unrealized Losses (7,820) (702)
Fair Value 242,607 316,822
Commercial Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 385 1,275
Unrealized Gains 0 29
Unrealized Losses (11) 0
Fair Value 374 1,304
Corporate Notes and Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,744 17,368
Unrealized Gains 65 26
Unrealized Losses (1,734) (2,370)
Fair Value 14,075 15,024
Pooled Trust Preferred [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 800 800
Unrealized Gains 0 0
Unrealized Losses (139) (200)
Fair Value 661 600
Pooled SBA [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 70,077 50,667
Unrealized Gains 688 2,277
Unrealized Losses (3,044) (17)
Fair Value 67,721 52,927
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,020 1,521
Unrealized Gains 0 17
Unrealized Losses (35) 0
Fair Value $ 985 $ 1,538