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Note 5 - Loans and Allowance for Credit Losses - Loans and Leases by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Commercial Portfolio Segment [Member] | Pass [Member]      
Loans, amount $ 1,031,263 $ 1,021,427 $ 891,850
Commercial Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 16,788 17,822 24,884
Commercial Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 11,996 $ 13,008 $ 16,981
Commercial Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Commercial Portfolio Segment [Member]      
Loans, amount $ 1,060,047 $ 1,052,257 $ 933,715
Income Producing Portfolio Segment [Member] | Pass [Member]      
Loans, amount 2,110,620 2,096,032 1,719,982
Income Producing Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 12,709 13,328 14,900
Income Producing Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 14,762 $ 6,118 $ 4,601
Income Producing Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Income Producing Portfolio Segment [Member]      
Loans, amount $ 2,138,091 $ 2,115,478 $ 1,739,483
Owner Occupied Portfolio Segment [Member] | Pass [Member]      
Loans, amount 559,390 488,496 478,486
Owner Occupied Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 9,262 7,854 7,677
Owner Occupied Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 1,263 $ 1,753 $ 6,840
Owner Occupied Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Owner Occupied Portfolio Segment [Member]      
Loans, amount $ 569,915 $ 498,103 $ 493,003
Residential Portfolio Segment [Member] | Pass [Member]      
Loans, amount 146,804 146,651 147,121
Residential Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 2,098 $ 714 $ 750
Residential Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 257
Residential Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Residential Portfolio Segment [Member]      
Loans, amount $ 149,159 $ 147,365 $ 147,871
Construction Portfolio Segment [Member] | Pass [Member]      
Loans, amount 1,115,027 1,049,926 889,346
Construction Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 1,564 4,996 8,225
Construction Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 5,422 $ 10,454 $ 14,000
Construction Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Construction Portfolio Segment [Member]      
Loans, amount $ 1,122,013 $ 1,065,376 $ 911,571
Home Equity Portfolio Segment [Member] | Pass [Member]      
Loans, amount 109,065 110,870 117,936
Home Equity Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 1,798 1,854 1,718
Home Equity Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 122 $ 161 $ 889
Home Equity Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Home Equity Portfolio Segment [Member]      
Loans, amount $ 110,985 $ 112,885 $ 120,543
Other Consumer Portfolio Segment [Member] | Pass [Member]      
Loans, amount 5,657 6,877 $ 98,697
Other Consumer Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount $ 4 5
Other Consumer Portfolio Segment [Member] | Substandard [Member]      
Loans, amount $ 22 $ 10
Other Consumer Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Other Consumer Portfolio Segment [Member]      
Loans, amount $ 5,661 $ 6,904 $ 98,707
Pass [Member]      
Loans, amount 5,077,826 4,920,279 4,343,418
Watch and Special Mention [Member]      
Loans, amount 44,223 46,573 58,154
Substandard [Member]      
Loans, amount $ 33,822 $ 31,516 $ 43,321
Doubtful [Member]      
Loans, amount
Loans, amount $ 5,155,871 $ 4,998,368 $ 4,444,893