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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	$ 327,515	$ 319,746
Held-to-maturity, Amortized Cost	162,661	165,767
Gross Unrealized Gains	4,905	5,697
Held-to-maturity, Gross Unrealized Gains	5,615	4,244
Gross Unrealized Losses	(1,450)	(1,679)
Held-to-maturity, Gross Unrealized Losses	(695)	(107)
Available-for-sale Securities, Fair Value	330,970	323,764
Held-to-maturity, Fair Value	167,581	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	28,308	26,996
Held-to-maturity, Amortized Cost	9,845	9,804
Gross Unrealized Gains	35	56
Held-to-maturity, Gross Unrealized Gains	102	82
Gross Unrealized Losses	(104)	(229)
Available-for-sale Securities, Fair Value	28,239	26,823
Held-to-maturity, Fair Value	9,947	9,886
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	49,739	46,535
Held-to-maturity, Amortized Cost	127,452	129,595
Gross Unrealized Gains	1,212	1,462
Held-to-maturity, Gross Unrealized Gains	4,416	3,398
Gross Unrealized Losses	(168)	(45)
Held-to-maturity, Gross Unrealized Losses	(511)	(106)
Available-for-sale Securities, Fair Value	50,783	47,952
Held-to-maturity, Fair Value	131,357	132,887
Federal Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	116,674	122,930
Held-to-maturity, Amortized Cost	3,670	4,039
Gross Unrealized Gains	973	975
Held-to-maturity, Gross Unrealized Gains	33	35
Gross Unrealized Losses	(705)	(1,045)
Held-to-maturity, Gross Unrealized Losses	(22)	(1)
Available-for-sale Securities, Fair Value	116,942	122,860
Held-to-maturity, Fair Value	3,681	4,073
Federal Agency Mortgage-backed Pools [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale investment securities, Amortized Cost	132,762	122,583
Held-to-maturity, Amortized Cost	21,694	22,329
Gross Unrealized Gains	2,661	3,172
Held-to-maturity, Gross Unrealized Gains	1,064	729
Gross Unrealized Losses	(473)	(360)
Held-to-maturity, Gross Unrealized Losses	(162)
Available-for-sale Securities, Fair Value	134,950	125,395
Held-to-maturity, Fair Value	22,596	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	24	13
Available-for-sale Securities, Fair Value	$ 56	$ 45

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