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Note 5 - Loans and Allowance for Credit Losses - Loans and Leases by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Commercial Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income $ 1,099,894 $ 1,021,427 $ 977,165
Commercial Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 18,599 17,822 17,625
Commercial Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 11,549 13,008 12,869
Commercial Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Commercial Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 1,130,042 1,052,257 1,007,659
Income Producing Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income 2,527,318 2,096,032 1,999,509
Income Producing Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 9,220 13,328 16,564
Income Producing Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 14,648 6,118 6,877
Income Producing Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Income Producing Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 2,551,186 2,115,478 2,022,950
Owner Occupied Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income 577,925 488,496 479,843
Owner Occupied Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 10,399 7,854 8,024
Owner Occupied Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 2,103 1,753 1,790
Owner Occupied Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Owner Occupied Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 590,427 498,103 489,657
Residential Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income 153,515 146,651 146,992
Residential Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 680 714 728
Residential Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 244
Residential Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Residential Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 154,439 147,365 147,720
Construction Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income 937,198 1,049,926 964,854
Construction Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 737 4,996 5,254
Construction Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 4,878 10,454 17,644
Construction Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Construction Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 942,813 1,065,376 987,752
Home Equity Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income 105,126 110,870 112,978
Home Equity Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 1,617 1,854 1,707
Home Equity Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 113 161 661
Home Equity Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Home Equity Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 106,856 112,885 115,346
Other Consumer Portfolio Segment [Member] | Pass [Member]      
Loans and leases receivable, net of deferred income 6,209 6,877 5,804
Other Consumer Portfolio Segment [Member] | Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 3 5 5
Other Consumer Portfolio Segment [Member] | Substandard [Member]      
Loans and leases receivable, net of deferred income 22 72
Other Consumer Portfolio Segment [Member] | Doubtful [Member]      
Loans and leases receivable, net of deferred income
Other Consumer Portfolio Segment [Member]      
Loans and leases receivable, net of deferred income 6,212 6,904 5,881
Pass [Member]      
Loans and leases receivable, net of deferred income 5,407,185 4,920,279 4,687,145
Watch and Special Mention [Member]      
Loans and leases receivable, net of deferred income 41,255 46,573 49,907
Substandard [Member]      
Loans and leases receivable, net of deferred income 33,535 31,516 39,913
Doubtful [Member]      
Loans and leases receivable, net of deferred income
Loans and leases receivable, net of deferred income $ 5,481,975 $ 4,998,368 $ 4,776,965