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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 446,558	$ 444,062
Gross Unrealized Gains	9,030	3,971
Held-to-maturity, Amortized Cost	173,696	187,629
Gross Unrealized Losses	(349)	(3,051)
Held-to-maturity, Gross Unrealized Gains	8,969	6,636
Available-for-sale Securities, Fair Value	455,239	444,982
Held-to-maturity, Gross Unrealized Losses	(2,606)	(562)
Held-to-maturity, Fair Value	180,059	193,703
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	18,384	5,940
Gross Unrealized Gains	86	3
Held-to-maturity, Amortized Cost		5,859
Gross Unrealized Losses		(17)
Held-to-maturity, Gross Unrealized Gains		93
Available-for-sale Securities, Fair Value	18,470	5,926
Held-to-maturity, Fair Value		5,952
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	60,961	73,829
Gross Unrealized Gains	1,654	1,299
Held-to-maturity, Amortized Cost	143,093	146,331
Gross Unrealized Losses	(4)	(33)
Held-to-maturity, Gross Unrealized Gains	7,586	5,375
Available-for-sale Securities, Fair Value	62,611	75,095
Held-to-maturity, Gross Unrealized Losses	(2,606)	(253)
Held-to-maturity, Fair Value	148,073	151,453
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	151,736	157,291
Gross Unrealized Gains	2,596	567
Held-to-maturity, Amortized Cost	8,424	9,051
Gross Unrealized Losses	(69)	(1,655)
Held-to-maturity, Gross Unrealized Gains	199	27
Available-for-sale Securities, Fair Value	154,263	156,203
Held-to-maturity, Gross Unrealized Losses		(124)
Held-to-maturity, Fair Value	8,623	8,954
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	215,445	206,970
Gross Unrealized Gains	4,654	2,080
Held-to-maturity, Amortized Cost	22,179	26,388
Gross Unrealized Losses	(276)	(1,346)
Held-to-maturity, Gross Unrealized Gains	1,184	1,141
Available-for-sale Securities, Fair Value	219,823	207,704
Held-to-maturity, Gross Unrealized Losses		(185)
Held-to-maturity, Fair Value	23,363	27,344
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	32	32
Gross Unrealized Gains	40	22
Available-for-sale Securities, Fair Value	$ 72	$ 54

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