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Note 5 - Loans and Allowance for Credit Losses - Recorded Investment in Loans by Impairment Method (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Commercial Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment $ 12,448 $ 13,008 $ 12,869
Loans collectively evaluated for impairment 1,117,594 1,039,249 994,790
Net loans 1,130,042 1,052,257 1,007,659
Income Producing Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment 14,648 6,118 6,877
Loans collectively evaluated for impairment 2,536,538 2,109,360 2,016,073
Net loans 2,551,186 2,115,478 2,022,950
Owner Occupied Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment 2,517 1,753 1,790
Loans collectively evaluated for impairment 587,910 496,350 487,867
Net loans 590,427 498,103 489,657
Residential Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment 244
Loans collectively evaluated for impairment 154,195 147,365 147,720
Net loans 154,439 147,365 147,720
Construction Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment 4,878 10,454 17,644
Loans collectively evaluated for impairment 937,935 1,054,922 970,108
Net loans 942,813 1,065,376 987,752
Home Equity Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment 113 161 661
Loans collectively evaluated for impairment 106,743 112,724 114,685
Net loans 106,856 112,885 115,346
Other Consumer Portfolio Segment [Member]      
Recorded investment in loans:      
Loans individually evaluated for impairment 22 72
Loans collectively evaluated for impairment 6,212 6,882 5,809
Net loans 6,212 6,904 5,881
Loans individually evaluated for impairment 34,848 31,516 39,913
Loans collectively evaluated for impairment 5,447,127 4,966,852 4,737,052
Net loans $ 5,481,975 $ 4,998,368 $ 4,776,965