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Securities - Summary of Amortized Costs and Fair Values of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	$ 113,098	$ 83,494
Securities available for sale, Gross Unrealized Gains	548	704
Securities available for sale, Gross Unrealized (Losses)	(1,178)	(906)
Securities available for sale, Fair Value	112,468	83,292
Securities held to maturity, Amortized Cost	37,343
Securities held to maturity, Gross Unrealized Gains	2
Securities held to maturity, Gross Unrealized (Losses)	(494)
Securities held to maturity, Fair Value	36,851	0
Total securities, Amortized Cost	150,441
Total securities, Gross Unrealized Gains	550
Total securities, Gross Unrealized Gains	(1,672)
Total securities, Fair Value	149,319
U.S. Agency and Mortgage-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	97,013	67,462
Securities available for sale, Gross Unrealized Gains	289	374
Securities available for sale, Gross Unrealized (Losses)	(1,082)	(807)
Securities available for sale, Fair Value	96,220	67,029
Securities held to maturity, Amortized Cost	30,376
Securities held to maturity, Gross Unrealized (Losses)	(404)
Securities held to maturity, Fair Value	29,972
Obligations of States and Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	16,084	16,031
Securities available for sale, Gross Unrealized Gains	253	325
Securities available for sale, Gross Unrealized (Losses)	(96)	(99)
Securities available for sale, Fair Value	16,241	16,257
Securities held to maturity, Amortized Cost	6,967
Securities held to maturity, Gross Unrealized Gains	2
Securities held to maturity, Gross Unrealized (Losses)	(90)
Securities held to maturity, Fair Value	6,879
Corporate Equity Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	1	1
Securities available for sale, Gross Unrealized Gains	6	5
Securities available for sale, Fair Value	$ 7	$ 6

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