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Note 4 - Loans and Allowance for Credit Losses (Detail) - Effect of nonaccrual loans on interest income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income that would have been recognized had the loans performed in accordance with their original terms	$ 4,337	$ 7,132	$ 8,112
Less: Interest income recognized on nonaccrual loans	(2,605)	(4,290)	(6,587)
Total reduction of interest income	$ 1,732	$ 2,842	$ 1,525

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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