Commitments and Contingencies - Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Loss Contingencies [Line Items]
Total commitments	$ 71,314
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Total commitments	62,112
Credit Card Commitments [Member]
Loss Contingencies [Line Items]
Total commitments	8,102
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Total commitments	$ 1,100