Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit amount	$ 135,056,000	$ 118,887,000
Unfunded limited partner equity commitment	3,746,000	4,000,000
Renewal period of contract for outsourced data services		5 years 6 months
Minimum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit fixed interest rate	3.50%
Maximum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit fixed interest rate	5.875%
Secured Credit Risk [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Secured amount of commitment to extend credit	77,565,000
Secured [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	3,187,000	3,629,000
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit amount	135,056,000
Fixed Interest Rate Credit Risk [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit fixed interest rate	$ 9,454,000