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

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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Total Undisbursed Loan Commitments	$ 187,701	$ 212,885
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Total Undisbursed Loan Commitments	158,744	182,746
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Total Undisbursed Loan Commitments	10,493	10,588
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Total Undisbursed Loan Commitments	4,817	6,092
Unused Credit Card Lines [Member]
Loss Contingencies [Line Items]
Total Undisbursed Loan Commitments	$ 13,647	$ 13,459