Securities - Summary of Amortized Cost and Fair Value of Debt Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Available-for-sale:
Due in one year or less, Amortized Cost	$ 3,307
Due after one through five years, Amortized Cost	13,561
Due after five through ten years, Amortized Cost	19,901
Due after ten years, Amortized Cost	55,821
Total debt securities available-for-sale, Amortized Cost	92,590
Due in one year or less, Fair Value	3,326
Due after one through five years, Fair Value	13,749
Due after five through ten years, Fair Value	19,889
Due after ten years, Fair Value	56,300
Total debt securities available-for-sale, Fair Value	93,264
Held-to-maturity:
Due after five through ten years, Amortized Cost	3,735
Due after ten years, Amortized Cost	35,211
Total debt securities held-to-maturity, Amortized Cost	38,946	44,350
Due after five through ten years, Fair Value	3,788
Due after ten years, Fair Value	35,073
Fair Value, Held to maturity	$ 38,861	$ 42,643