Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail)

v2.4.0.8

Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 282,689	$ 271,489
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	268,093	246,161
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	8,566	8,926
Commercial letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	4,469	4,179
Unused credit card lines [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 1,561	$ 12,223