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Securities - Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 695,716 $ 697,738
Unrealized Gains 13,512 9,827
Unrealized Losses (13,809) (21,574)
Fair Value 695,419 685,991
U.S. Government Sponsored Entities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 168,144 185,205
Unrealized Gains 4,279 2,894
Unrealized Losses (5,247) (6,474)
Fair Value 167,176 181,625
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 178,078 176,490
Unrealized Gains 5,849 3,770
Unrealized Losses (715) (2,317)
Fair Value 183,212 177,943
Residential and Multi-Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 264,882 248,017
Unrealized Gains 2,432 2,410
Unrealized Losses (4,413) (7,820)
Fair Value 262,901 242,607
Commercial Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 193 385
Unrealized Gains 0 0
Unrealized Losses (5) (11)
Fair Value 188 374
Corporate Notes and Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,748 15,744
Unrealized Gains 116 65
Unrealized Losses (1,380) (1,734)
Fair Value 14,484 14,075
Pooled Trust Preferred [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 800 800
Unrealized Gains 0 0
Unrealized Losses (2) (139)
Fair Value 798 661
Pooled SBA [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 66,851 70,077
Unrealized Gains 836 688
Unrealized Losses (2,029) (3,044)
Fair Value 65,658 67,721
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,020 1,020
Unrealized Gains 0 0
Unrealized Losses (18) (35)
Fair Value $ 1,002 $ 985