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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 430,435	$ 319,746
Held-to-maturity, Amortized Cost	182,187	165,767
Gross Unrealized Gains	6,021	5,697
Held-to-maturity, Gross Unrealized Gains	6,665	4,244
Gross Unrealized Losses	(783)	(1,679)
Held-to-maturity, Gross Unrealized Losses	(278)	(107)
Available-for-sale Securities, Fair Value	435,673	323,764
Held-to-maturity, Fair Value	188,574	169,904
U.S. Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	24,724	26,996
Held-to-maturity, Amortized Cost	5,852	9,804
Gross Unrealized Gains	45	56
Held-to-maturity, Gross Unrealized Gains	136	82
Gross Unrealized Losses	(14)	(229)
Available-for-sale Securities, Fair Value	24,755	26,823
Held-to-maturity, Fair Value	5,988	9,886
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	58,467	46,535
Held-to-maturity, Amortized Cost	142,763	129,595
Gross Unrealized Gains	1,349	1,462
Held-to-maturity, Gross Unrealized Gains	5,262	3,398
Gross Unrealized Losses	(35)	(45)
Held-to-maturity, Gross Unrealized Losses	(177)	(106)
Available-for-sale Securities, Fair Value	59,781	47,952
Held-to-maturity, Fair Value	147,848	132,887
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	134,494	122,930
Held-to-maturity, Amortized Cost	9,356	4,039
Gross Unrealized Gains	1,426	975
Held-to-maturity, Gross Unrealized Gains	59	35
Gross Unrealized Losses	(353)	(1,045)
Held-to-maturity, Gross Unrealized Losses	(12)	(1)
Available-for-sale Securities, Fair Value	135,567	122,860
Held-to-maturity, Fair Value	9,403	4,073
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	212,718	122,583
Held-to-maturity, Amortized Cost	24,216	22,329
Gross Unrealized Gains	3,179	3,172
Held-to-maturity, Gross Unrealized Gains	1,208	729
Gross Unrealized Losses	(381)	(360)
Held-to-maturity, Gross Unrealized Losses	(89)
Available-for-sale Securities, Fair Value	215,516	125,395
Held-to-maturity, Fair Value	25,335	23,058
Private Labeled Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost		670
Gross Unrealized Gains		19
Available-for-sale Securities, Fair Value		689
Corporate Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	32	32
Gross Unrealized Gains	22	13
Available-for-sale Securities, Fair Value	$ 54	$ 45

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