Securities - Amortized Cost and Fair Value of Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total debt securities, amortized cost	$ 215,095	$ 285,626	$ 253,649
Equity securities, amortized cost	650	650	650
Total available for sale securities, amortized cost	215,745	286,276	254,299
Total debt securities, gross unrealized gains	1,604	2,177	4,996
Equity securities, gross unrealized gains	0	0	0
Total available for sale securities, gross unrealized gains	1,604	2,177	4,996
Total debt securities, gross unrealized losses	(2,227)	(13,013)	(419)
Equity securities, gross unrealized losses
Total available for sale securities, gross unrealized losses	(2,227)	(13,013)	(419)
Total debt securities, fair value	214,472	274,790	258,226
Equity securities, fair value	650	650	650
Total available for sale securities, fair value	215,122us-gaap_AvailableForSaleSecurities	275,440us-gaap_AvailableForSaleSecurities	258,876us-gaap_AvailableForSaleSecurities
Held to maturity securities, Amortized Cost	17,784us-gaap_HeldToMaturitySecurities	11,142us-gaap_HeldToMaturitySecurities	7,125us-gaap_HeldToMaturitySecurities
Held to maturity securities, Gross Unrealized Gains	132	13	112
Held to maturity securities, Gross Unrealized Losses	(57)	(469)	(12)
Held to maturity securities, fair value	17,859	10,686	7,225
States and political subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total debt securities, amortized cost	29,832	33,764	35,433
Total debt securities, gross unrealized gains	1,180	1,248	2,158
Total debt securities, gross unrealized losses		(1)
Total debt securities, fair value	31,012	35,011	37,591
Held to maturity securities, Amortized Cost	17,784	11,142	7,125
Held to maturity securities, Gross Unrealized Gains	132	13	112
Held to maturity securities, Gross Unrealized Losses	(57)	(469)	(12)
Held to maturity securities, fair value	17,859	10,686	7,225
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total debt securities, amortized cost	29,787	44,636	53,661
Total debt securities, gross unrealized gains	27	54	490
Total debt securities, gross unrealized losses	(160)	(1,042)	(55)
Total debt securities, fair value	29,654	43,648	54,096
U.S. Government agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total debt securities, amortized cost	119,805	155,772	147,652
Total debt securities, gross unrealized gains	115	734	1,810
Total debt securities, gross unrealized losses	(1,931)	(10,701)	(364)
Total debt securities, fair value	117,989	145,805	149,098
Mortgage-backed securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total debt securities, amortized cost	35,671	51,454	16,903
Total debt securities, gross unrealized gains	282	141	538
Total debt securities, gross unrealized losses	(136)	(1,269)
Total debt securities, fair value	$ 35,817	$ 50,326	$ 17,441

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