Commitments and Contingent Liabilities - Summary of Company's Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 257,195	$ 180,733
Financial standby letters of credit	7,665	6,788
Total commitments	$ 264,860	$ 187,521