Investment Securities - Amortized Cost and Fair Value of Securities Available for Sale, by Contractual Maturity (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, Amortized Cost	$ 1,291,000
Due after one year through five years, Amortized Cost	7,103,000
Due after five years through ten years, Amortized Cost	72,224,000
Due after ten years, Amortized Cost	32,106,000
Amortized Cost, Total	112,724,000
Available-for-sale securities, Amortized Cost	207,455,000	204,313,000
Due in one year or less, Fair Value	1,312,000
Due after one year through five years, Fair Value	7,133,000
Due after five years through ten years, Fair Value	71,428,000
Due after ten years, Fair Value	32,963,000
Fair Value, Total	112,836,000
Available-for-sale (at fair value)	205,678,778	199,955,367
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	94,567,000	93,501,000
Available-for-sale (at fair value)	92,647,000	90,900,000
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	164,000	165,000
Available-for-sale (at fair value)	$ 196,000	$ 195,000