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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 550,456	$ 444,062
Gross Unrealized Gains	7,572	3,971
Held-to-maturity, Amortized Cost	187,027	187,629
Gross Unrealized Losses	(815)	(3,051)
Held-to-maturity, Gross Unrealized Gains	8,028	6,636
Available-for-sale Securities, Fair Value	557,213	444,982
Held-to-maturity, Gross Unrealized Losses	(761)	(562)
Held-to-maturity, Fair Value	194,294	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	27,383	5,940
Gross Unrealized Gains	54	3
Held-to-maturity, Amortized Cost		5,859
Gross Unrealized Losses	(15)	(17)
Held-to-maturity, Gross Unrealized Gains		93
Available-for-sale Securities, Fair Value	27,422	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	62,825	73,829
Gross Unrealized Gains	1,321	1,299
Held-to-maturity, Amortized Cost	158,543	146,331
Gross Unrealized Losses	(107)	(33)
Held-to-maturity, Gross Unrealized Gains	6,718	5,375
Available-for-sale Securities, Fair Value	64,039	75,095
Held-to-maturity, Gross Unrealized Losses	(761)	(253)
Held-to-maturity, Fair Value	164,500	151,453
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	188,072	157,291
Gross Unrealized Gains	1,894	567
Held-to-maturity, Amortized Cost	6,828	9,051
Gross Unrealized Losses	(282)	(1,655)
Held-to-maturity, Gross Unrealized Gains	144	27
Available-for-sale Securities, Fair Value	189,684	156,203
Held-to-maturity, Gross Unrealized Losses		(124)
Held-to-maturity, Fair Value	6,972	8,954
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	272,144	206,970
Gross Unrealized Gains	4,240	2,080
Held-to-maturity, Amortized Cost	21,656	26,388
Gross Unrealized Losses	(411)	(1,346)
Held-to-maturity, Gross Unrealized Gains	1,166	1,141
Available-for-sale Securities, Fair Value	275,973	207,704
Held-to-maturity, Gross Unrealized Losses		(185)
Held-to-maturity, Fair Value	22,822	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	63	22
Available-for-sale Securities, Fair Value	$ 95	$ 54

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