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Note 5 - Loans and Allowance for Credit Losses - Loans and Leases by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Commercial Portfolio Segment [Member] | Pass [Member]      
Loans, amount $ 1,112,108 $ 1,021,427 $ 920,429
Commercial Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 17,842 17,822 22,111
Commercial Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 10,913 13,008 17,966
Commercial Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Commercial Portfolio Segment [Member]      
Loans, amount 1,140,863 1,052,257 960,506
Income Producing Portfolio Segment [Member] | Pass [Member]      
Loans, amount 2,424,180 2,096,032 1,837,021
Income Producing Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 22,763 13,328 24,191
Income Producing Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 14,638 6,118 2,371
Income Producing Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Income Producing Portfolio Segment [Member]      
Loans, amount 2,461,581 2,115,478 1,863,583
Owner Occupied Portfolio Segment [Member] | Pass [Member]      
Loans, amount 572,598 488,496 487,922
Owner Occupied Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 10,499 7,854 8,085
Owner Occupied Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 1,261 1,753 1,827
Owner Occupied Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Owner Occupied Portfolio Segment [Member]      
Loans, amount 584,358 498,103 497,834
Residential Portfolio Segment [Member] | Pass [Member]      
Loans, amount 149,181 146,651 149,101
Residential Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 694 714 741
Residential Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 254
Residential Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Residential Portfolio Segment [Member]      
Loans, amount 150,129 147,365 149,842
Construction Portfolio Segment [Member] | Pass [Member]      
Loans, amount 938,148 1,049,926 937,069
Construction Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 3,770 4,996 791
Construction Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 5,413 10,454 17,891
Construction Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Construction Portfolio Segment [Member]      
Loans, amount 947,331 1,065,376 955,751
Home Equity Portfolio Segment [Member] | Pass [Member]      
Loans, amount 108,954 110,870 115,945
Home Equity Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 1,622 1,854 1,712
Home Equity Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 121 161 887
Home Equity Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Home Equity Portfolio Segment [Member]      
Loans, amount 110,697 112,885 118,544
Other Consumer Portfolio Segment [Member] | Pass [Member]      
Loans, amount 8,467 6,877 4,819
Other Consumer Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans, amount 3 5
Other Consumer Portfolio Segment [Member] | Substandard [Member]      
Loans, amount 22 18
Other Consumer Portfolio Segment [Member] | Doubtful [Member]      
Loans, amount
Other Consumer Portfolio Segment [Member]      
Loans, amount 8,470 6,904 4,837
Pass [Member]      
Loans, amount 5,313,636 4,920,279 4,452,306
Watch and Special Mention [Member]      
Loans, amount 57,193 46,573 57,631
Substandard [Member]      
Loans, amount 32,600 31,516 40,960
Doubtful [Member]      
Loans, amount
Loans, amount $ 5,403,429 $ 4,998,368 $ 4,550,897