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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months $ 225,524 $ 34,286
Fair value more than 12 months 42,380 90,657
Total fair value 267,904 124,943
Unrealized losses less than 12 months (2,632) (225)
Unrealized losses more than 12 months (980) (1,560)
Total unrealized losses (3,613) (1,785)
U.S. Treasury and Federal Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 5,468 2,993
Fair value more than 12 months   20,762
Total fair value 5,468 23,755
Unrealized losses less than 12 months (17) (7)
Unrealized losses more than 12 months   (222)
Total unrealized losses (17) (229)
State and Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 17,353 10,287
Fair value more than 12 months 446 2,050
Total fair value 17,799 12,337
Unrealized losses less than 12 months (280) (121)
Unrealized losses more than 12 months (6) (30)
Total unrealized losses (286) (151)
Federal Agency Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 89,459 15,013
Fair value more than 12 months 25,428 39,801
Total fair value 114,887 54,814
Unrealized losses less than 12 months (1,123) (88)
Unrealized losses more than 12 months (655) (957)
Total unrealized losses (1,779) (1,045)
Federal Agency Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 113,244 5,993
Fair value more than 12 months 16,506 28,044
Total fair value 129,750 34,037
Unrealized losses less than 12 months (1,212) (9)
Unrealized losses more than 12 months (319) (351)
Total unrealized losses $ (1,531) $ (360)