Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Allowance for credit losses associated with loan commitments	$ 536	$ 602	$ 317	$ 341