FHLB - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	May 31, 2014
Debt Instrument [Line Items]
Number of FHLB debt advances	6
Federal Home Loan Bank advances	$ 35,000,000	$ 15,000,000
Immediate available credit	38,600,000
Total line of credit	77,600,000
Average interest rate		2.48%
Federal Home Loan Bank Advances One
Debt Instrument [Line Items]
Federal Home Loan Bank advances	10,000,000
Advances, Variable rate description	Three month LIBOR-based hybrid floating rate advance
Interest rate LIBOR-based floating rate advance			4.23%
Federal Home Loan Bank Advances Two
Debt Instrument [Line Items]
Federal Home Loan Bank advances				5,000,000
Interest rate LIBOR-based floating rate advance				2.69%
Federal Home Loan Bank Advances Three
Debt Instrument [Line Items]
Federal Home Loan Bank advances	5,000,000
Advances, Variable rate description	Three month LIBOR-based floating rate advance
Federal Home Loan Bank Advances Four
Debt Instrument [Line Items]
Federal Home Loan Bank advances	5,000,000
Advances, Variable rate description	Fixed rate advances
Federal Home Loan Bank Advances Five
Debt Instrument [Line Items]
Federal Home Loan Bank advances	5,000,000
Advances, Variable rate description	Fixed rate advances
Federal Home Loan Bank Advances Six
Debt Instrument [Line Items]
Federal Home Loan Bank advances	5,000,000
Advances, Variable rate description	Fixed rate advances
Federal Home Loan Bank Advances Seven
Debt Instrument [Line Items]
Federal Home Loan Bank advances	$ 5,000,000
Advances, Variable rate description	Fixed rate advances