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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months $ 67,613 $ 34,286
Fair value more than 12 months 59,791 90,657
Total fair value 127,405 124,943
Unrealized losses less than 12 months (591) (225)
Unrealized losses more than 12 months (469) (1,560)
Total unrealized losses (1,061) (1,785)
U.S. Treasury and Federal Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 5,995 2,993
Fair value more than 12 months 7,979 20,762
Total fair value 13,973 23,755
Unrealized losses less than 12 months (2) (7)
Unrealized losses more than 12 months (12) (222)
Total unrealized losses (14) (229)
State and Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 19,967 10,287
Fair value more than 12 months 736 2,050
Total fair value 20,704 12,337
Unrealized losses less than 12 months (207) (121)
Unrealized losses more than 12 months (4) (30)
Total unrealized losses (212) (151)
Federal Agency Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 10,178 15,013
Fair value more than 12 months 27,071 39,801
Total fair value 37,250 54,814
Unrealized losses less than 12 months (54) (88)
Unrealized losses more than 12 months (311) (957)
Total unrealized losses (365) (1,045)
Federal Agency Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 31,473 5,993
Fair value more than 12 months 24,005 28,044
Total fair value 55,478 34,037
Unrealized losses less than 12 months (328) (9)
Unrealized losses more than 12 months (142) (351)
Total unrealized losses $ (470) $ (360)