FHLB - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Advance on which FHLB holds an option to terminate	$ 10
Advances, Variable rate description	Three month LIBOR-based floating rate advance
Interest rate LIBOR-based floating rate advance	4.23%
Short-term advances from FHLB	0	0
Lendable collateral value of 1 to 4 family residential real estate loans	54.7
Immediate available credit	37.7
Total line of credit	66.8
Available line of credit	49.8
FHLB
Debt Instrument [Line Items]
Outstanding letters of credit	$ 2.0