Note 4 - Loans and Allowance for Credit Losses (Detail) - Nonaccrual Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Nonaccrual Loans	$ 28,166	[1],[2]	$ 30,684	[1],[2]	$ 36,715	[1],[2]
Commercial Loan [Member]
Nonaccrual Loans	4,039		4,799		3,565
Commercial Real Estate Investment [Member]
Nonaccrual Loans	3,269		3,458		7,013
Commercial Real Estate Owner Occupied [Member]
Nonaccrual Loans	2,368		2,578		277
Residential Mortgage [Member]
Nonaccrual Loans	691		699		731
Home Equity Line of Credit [Member]
Nonaccrual Loans	481		513		530
Consumer, Other [Member]
Nonaccrual Loans			43		8
Construction Loans [Member]
Nonaccrual Loans	$ 17,318		$ 18,594		$ 24,591

[1] Excludes performing TDRs totaling $14.8 million at March 31, 2013, $15.3 million at December 31, 2012 and $11.4 million at March 31, 2012.

[2] Gross interest income that would have been recorded in 2013 if nonaccrual loans shown above had been current and in accordance with their original terms was $1.8 million, while interest actually recorded on such loans was $97 thousand for the three months ended March 31, 2013. See Note 1 to the Consolidated Financial Statements for a description of the Company's policy for placing loans on nonaccrual status.