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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months $ 128,845 $ 225,524
Fair value more than 12 months 19,083 42,380
Total fair value 147,928 267,904
Unrealized losses less than 12 months (1,432) (2,633)
Unrealized losses more than 12 months (144) (980)
Total unrealized losses (1,576) (3,613)
U.S. Treasury and Federal Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 6,594 5,468
Total fair value 6,594 5,468
Unrealized losses less than 12 months (15) (17)
Total unrealized losses (15) (17)
State and Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 26,360 17,353
Fair value more than 12 months   446
Total fair value 26,360 17,799
Unrealized losses less than 12 months (868) (280)
Unrealized losses more than 12 months   (6)
Total unrealized losses (868) (286)
Federal Agency Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 48,837 89,459
Fair value more than 12 months 12,304 25,428
Total fair value 61,141 114,887
Unrealized losses less than 12 months (184) (1,124)
Unrealized losses more than 12 months (98) (655)
Total unrealized losses (282) (1,779)
Federal Agency Mortgage-backed Pools [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 47,054 113,244
Fair value more than 12 months 6,779 16,506
Total fair value 53,833 129,750
Unrealized losses less than 12 months (365) (1,212)
Unrealized losses more than 12 months (46) (319)
Total unrealized losses $ (411) $ (1,531)