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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 513,602	$ 445,839
Gross Unrealized Gains	2,502	922
Gross Unrealized Losses	(6,439)	(6,929)
Available-for-sale Securities, Fair Value	509,665	439,831
Held-to-maturity, Amortized Cost	200,448	193,194
Held-to-maturity, Gross Unrealized Gains	3,726	3,628
Held-to-maturity, Gross Unrealized Losses	(3,089)	(2,736)
Held-to-maturity, Fair Value	201,085	194,086
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	148,045	117,327
Gross Unrealized Gains	2,189	324
Gross Unrealized Losses	(670)	(1,059)
Available-for-sale Securities, Fair Value	149,564	116,592
Held-to-maturity, Amortized Cost	179,836	165,607
Held-to-maturity, Gross Unrealized Gains	3,493	2,700
Held-to-maturity, Gross Unrealized Losses	(2,932)	(2,485)
Held-to-maturity, Fair Value	180,397	165,822
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	132,871	139,040
Gross Unrealized Gains	45	254
Gross Unrealized Losses	(2,551)	(2,099)
Available-for-sale Securities, Fair Value	130,365	137,195
Held-to-maturity, Amortized Cost	5,734	6,530
Held-to-maturity, Gross Unrealized Gains	17	31
Held-to-maturity, Gross Unrealized Losses	(69)	(71)
Held-to-maturity, Fair Value	5,682	6,490
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	211,487	180,183
Gross Unrealized Gains	155	251
Gross Unrealized Losses	(2,985)	(3,707)
Available-for-sale Securities, Fair Value	208,657	176,726
Held-to-maturity, Amortized Cost	14,878	21,057
Held-to-maturity, Gross Unrealized Gains	216	897
Held-to-maturity, Gross Unrealized Losses	(88)	(180)
Held-to-maturity, Fair Value	15,006	21,774
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	19,277	8,051
Gross Unrealized Gains		2
Gross Unrealized Losses	(225)	(64)
Available-for-sale Securities, Fair Value	19,052	7,989
Private Labeled Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	1,650
Gross Unrealized Losses	(8)
Available-for-sale Securities, Fair Value	1,642
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	272	1,238
Gross Unrealized Gains	113	91
Available-for-sale Securities, Fair Value	$ 385	$ 1,329

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