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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 477,670	$ 445,839
Gross Unrealized Gains	2,712	922
Held-to-maturity, Amortized Cost	198,868	193,194
Gross Unrealized Losses	(6,160)	(6,929)
Held-to-maturity, Gross Unrealized Gains	3,796	3,628
Available-for-sale Securities, Fair Value	474,222	439,831
Held-to-maturity, Gross Unrealized Losses	(2,182)	(2,736)
Held-to-maturity, Fair Value	200,482	194,086
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	13,546	8,051
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(68)	(64)
Available-for-sale Securities, Fair Value	13,480	7,989
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	127,108	117,327
Gross Unrealized Gains	656	324
Held-to-maturity, Amortized Cost	176,631	165,607
Gross Unrealized Losses	(659)	(1,059)
Held-to-maturity, Gross Unrealized Gains	3,317	2,700
Available-for-sale Securities, Fair Value	127,105	116,592
Held-to-maturity, Gross Unrealized Losses	(1,948)	(2,485)
Held-to-maturity, Fair Value	178,000	165,822
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	137,815	139,040
Gross Unrealized Gains	241	254
Held-to-maturity, Amortized Cost	6,297	6,530
Gross Unrealized Losses	(1,867)	(2,099)
Held-to-maturity, Gross Unrealized Gains	30	31
Available-for-sale Securities, Fair Value	136,189	137,195
Held-to-maturity, Gross Unrealized Losses	(65)	(71)
Held-to-maturity, Fair Value	6,262	6,490
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	196,064	180,183
Gross Unrealized Gains	1,194	251
Held-to-maturity, Amortized Cost	15,940	21,057
Gross Unrealized Losses	(3,547)	(3,707)
Held-to-maturity, Gross Unrealized Gains	449	897
Available-for-sale Securities, Fair Value	193,711	176,726
Held-to-maturity, Gross Unrealized Losses	(169)	(180)
Held-to-maturity, Fair Value	16,220	21,774
Private Labeled Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	1,901
Gross Unrealized Losses	(19)
Available-for-sale Securities, Fair Value	1,882
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	1,236	1,238
Gross Unrealized Gains	619	91
Available-for-sale Securities, Fair Value	$ 1,855	$ 1,329

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