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Note 5 - Loans and Allowance for Credit Losses - Recorded Investment in Loans by Impairment Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Commercial Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment $ 12,402 $ 13,008 $ 17,966
Collectively evaluated for impairment 1,128,461 1,039,249 942,540
Loans, amount 1,140,863 1,052,257 960,506
Income Producing Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment 19,778 6,118 2,371
Collectively evaluated for impairment 2,441,803 2,109,360 1,861,212
Loans, amount 2,461,581 2,115,478 1,863,583
Owner Occupied Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment 1,699 1,753 1,827
Collectively evaluated for impairment 582,659 496,350 496,007
Loans, amount 584,358 498,103 497,834
Residential Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment 254
Collectively evaluated for impairment 149,875 147,365 149,842
Loans, amount 150,129 147,365 149,842
Construction Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment 5,413 10,454 17,891
Collectively evaluated for impairment 941,918 1,054,922 937,860
Loans, amount 947,331 1,065,376 955,751
Home Equity Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment 121 161 887
Collectively evaluated for impairment 110,576 112,724 117,657
Loans, amount 110,697 112,885 118,544
Other Consumer Portfolio Segment [Member]      
Recorded investment in loans:      
Individually evaluated for impairment 22 18
Collectively evaluated for impairment 8,470 6,882 4,819
Loans, amount 8,470 6,904 4,837
Individually evaluated for impairment 39,667 31,516 40,960
Collectively evaluated for impairment 5,363,762 4,966,852 4,509,937
Loans, amount $ 5,403,429 $ 4,998,368 $ 4,550,897