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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 445,839	$ 444,062
Gross Unrealized Gains	922	3,971
Held-to-maturity, Amortized Cost	193,194	187,629
Gross Unrealized Losses	(6,929)	(3,051)
Held-to-maturity, Gross Unrealized Gains	3,628	6,636
Available-for-sale Securities, Fair Value	439,831	444,982
Held-to-maturity, Gross Unrealized Losses	(2,736)	(562)
Held-to-maturity, Fair Value	194,086	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	8,051	5,940
Gross Unrealized Gains	2	3
Held-to-maturity, Amortized Cost		5,859
Gross Unrealized Losses	(64)	(17)
Held-to-maturity, Gross Unrealized Gains		93
Available-for-sale Securities, Fair Value	7,989	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	117,327	73,829
Gross Unrealized Gains	324	1,299
Held-to-maturity, Amortized Cost	165,607	146,331
Gross Unrealized Losses	(1,059)	(33)
Held-to-maturity, Gross Unrealized Gains	2,700	5,375
Available-for-sale Securities, Fair Value	116,592	75,095
Held-to-maturity, Gross Unrealized Losses	(2,485)	(253)
Held-to-maturity, Fair Value	165,822	151,453
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	139,040	157,291
Gross Unrealized Gains	254	567
Held-to-maturity, Amortized Cost	6,530	9,051
Gross Unrealized Losses	(2,099)	(1,655)
Held-to-maturity, Gross Unrealized Gains	31	27
Available-for-sale Securities, Fair Value	137,195	156,203
Held-to-maturity, Gross Unrealized Losses	(71)	(124)
Held-to-maturity, Fair Value	6,490	8,954
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	180,183	206,970
Gross Unrealized Gains	251	2,080
Held-to-maturity, Amortized Cost	21,057	26,388
Gross Unrealized Losses	(3,707)	(1,346)
Held-to-maturity, Gross Unrealized Gains	897	1,141
Available-for-sale Securities, Fair Value	176,726	207,704
Held-to-maturity, Gross Unrealized Losses	(180)	(185)
Held-to-maturity, Fair Value	21,774	27,344
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	1,238	32
Gross Unrealized Gains	91	22
Available-for-sale Securities, Fair Value	$ 1,329	$ 54

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