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Note 5 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses by Portfolio Segment - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Allowance for credit losses:    
Balance at beginning of period $ 46,075 $ 40,921
Loans charged-off (8,598) (6,934)
Recoveries of loans previously charged-off 572 1,209
Net loan charged-off (8,026) (5,725)
Provision for credit losses 14,638 10,879
Individually evaluated for impairment 5,902 8,064
Collectively evaluated for impairment 46,785 38,011
Ending balance 52,687 46,075
Commercial Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 13,222 9,780
Loans charged-off (4,693) (2,634)
Recoveries of loans previously charged-off 195 977
Net loan charged-off (4,498) (1,657)
Provision for credit losses 2,839 5,099
Individually evaluated for impairment 3,478 5,334
Collectively evaluated for impairment 8,085 7,888
Ending balance 11,563 13,222
Income Producing Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 11,442 10,359
Loans charged-off (651) (121)
Recoveries of loans previously charged-off 26 42
Net loan charged-off (625) (79)
Provision for credit losses 3,305 1,162
Individually evaluated for impairment 1,033 751
Collectively evaluated for impairment 13,089 10,691
Ending balance 14,122 11,442
Owner Occupied Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 2,954 3,899
Loans charged-off 0 (752)
Recoveries of loans previously charged-off 3 7
Net loan charged-off 3 (745)
Provision for credit losses 322 (200)
Individually evaluated for impairment 400 577
Collectively evaluated for impairment 2,879 2,377
Ending balance 3,279 2,954
Residential Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 1,259 944
Loans charged-off 0 (138)
Recoveries of loans previously charged-off 7 0
Net loan charged-off 7 (138)
Provision for credit losses 2 453
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 1,268 1,259
Ending balance 1,268 1,259
Construction Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 15,625 13,934
Loans charged-off (1,884) (2,721)
Recoveries of loans previously charged-off 206 83
Net loan charged-off (1,678) (2,638)
Provision for credit losses 7,141 4,329
Individually evaluated for impairment 950 927
Collectively evaluated for impairment 20,138 14,698
Ending balance 21,088 15,625
Home Equity Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 1,469 1,871
Loans charged-off (1,142) (379)
Recoveries of loans previously charged-off 25 10
Net loan charged-off (1,117) (369)
Provision for credit losses 940 (33)
Individually evaluated for impairment 38 430
Collectively evaluated for impairment 1,254 1,039
Ending balance 1,292 1,469
Other Consumer Portfolio Segment [Member]    
Allowance for credit losses:    
Balance at beginning of period 104 134
Loans charged-off (228) (189)
Recoveries of loans previously charged-off 110 90
Net loan charged-off (118) (99)
Provision for credit losses 89 69
Individually evaluated for impairment 3 45
Collectively evaluated for impairment 72 59
Ending balance $ 75 $ 104