Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 295
Due after one year through five years, Amortized Cost	25,614
Due after five years through ten years, Amortized Cost	38,867
Due after ten years, Amortized Cost	61,914
Mortgage-backed securities, Amortized Cost	66,300
Equity securities, Amortized Cost	481
Total securities available for sale, Amortized Cost	193,471	199,094
Due in one year or less, Fair Value	297
Due after one year through five years, Fair Value	25,649
Due after five years through ten years, Fair Value	40,087
Due after ten years, Fair Value	63,821
Mortgage-backed securities, Fair Value	67,319
Equity securities, Fair Value	507
Total securities available for sale, Fair Value	$ 197,680	$ 199,613