Commitments and Contingencies - Summary of Total Notional Amount of Loan Commitments and Standby Letters of Credit (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Standby letters of credit	$ 106,467	$ 92,274
Unused loan commitments	268,760	256,294
Total	$ 375,227	$ 348,568