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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 510,445	$ 445,839
Gross Unrealized Gains	3,036	922
Gross Unrealized Losses	(3,637)	(6,929)
Available for sale Securities, Fair Value	509,844	439,831
Held to maturity, Amortized Cost	198,605	193,194
Held to maturity, Gross Unrealized Gains	4,581	3,628
Held to maturity, Gross Unrealized Losses	(964)	(2,736)
Held to maturity, Fair Value	202,222	194,086
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	141,751	117,327
Gross Unrealized Gains	2,288	324
Gross Unrealized Losses	(556)	(1,059)
Available for sale Securities, Fair Value	143,483	116,592
Held to maturity, Amortized Cost	177,473	165,607
Held to maturity, Gross Unrealized Gains	4,249	2,700
Held to maturity, Gross Unrealized Losses	(862)	(2,485)
Held to maturity, Fair Value	180,860	165,822
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	135,511	139,040
Gross Unrealized Gains	131	254
Gross Unrealized Losses	(1,440)	(2,099)
Available for sale Securities, Fair Value	134,202	137,195
Held to maturity, Amortized Cost	5,902	6,530
Held to maturity, Gross Unrealized Gains	25	31
Held to maturity, Gross Unrealized Losses	(31)	(71)
Held to maturity, Fair Value	5,896	6,490
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	213,071	180,183
Gross Unrealized Gains	496	251
Gross Unrealized Losses	(1,516)	(3,707)
Available for sale Securities, Fair Value	212,051	176,726
Held to maturity, Amortized Cost	15,230	21,057
Held to maturity, Gross Unrealized Gains	307	897
Held to maturity, Gross Unrealized Losses	(71)	(180)
Held to maturity, Fair Value	15,466	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	17,996	8,051
Gross Unrealized Gains	3	2
Gross Unrealized Losses	(114)	(64)
Available for sale Securities, Fair Value	17,885	7,989
Private Labeled Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	1,841
Gross Unrealized Losses	(11)
Available for sale Securities, Fair Value	1,830
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	275	1,238
Gross Unrealized Gains	118	91
Available for sale Securities, Fair Value	$ 393	$ 1,329

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