Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 135
Due after one year through five years, Amortized Cost	28,358
Due after five years through ten years, Amortized Cost	38,590
Due after ten years, Amortized Cost	60,818
Mortgage-backed securities, Amortized Cost	67,687
Equity securities, Amortized Cost	481
Amortized Cost	196,069	199,094
Due in one year or less, Fair Value	135
Due after one year through five years, Fair Value	28,343
Due after five years through ten years, Fair Value	40,032
Due after ten years, Fair Value	63,482
Mortgage-backed securities, Fair Value	68,366
Equity securities, Fair Value	533
Total securities available for sale, Fair Value	$ 200,891	$ 199,613