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Note 5 - Loans and Allowance for Credit Losses - Allowance for Credit Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Commercial Portfolio Segment [Member]            
Balance $ 13,386 $ 12,911 $ 11,563 $ 13,222    
Loans charged-off (109) (1,388) (2,802) (4,693)    
Recoveries of loans previously charged-off 7 60 93 135    
Net loans (charged-off) recoveries (102) (1,328) (2,709) (4,558)    
Provision for credit losses (523) 57 3,907 2,976    
Balance 12,761 11,640 12,761 11,640    
Individually evaluated for impairment         $ 1,997 $ 2,312
Collectively evaluated for impairment         10,764 9,328
Ending balance 13,386 12,911 12,761 11,640 12,761 11,640
Income Producing Portfolio Segment [Member]            
Balance 19,072 12,411 14,122 11,442    
Loans charged-off (1,751) (254) (2,342) (651)    
Recoveries of loans previously charged-off 10 8 14 26    
Net loans (charged-off) recoveries (1,741) (246) (2,328) (625)    
Provision for credit losses 3,178 1,550 8,715 2,898    
Balance 20,509 13,715 20,509 13,715    
Individually evaluated for impairment         1,714 827
Collectively evaluated for impairment         18,795 12,888
Ending balance 19,072 12,411 20,509 13,715 20,509 13,715
Owner Occupied Portfolio Segment [Member]            
Balance 4,202 3,113 3,279 2,954    
Loans charged-off    
Recoveries of loans previously charged-off 2 2    
Net loans (charged-off) recoveries 2 2    
Provision for credit losses 59 (13) 980 144    
Balance 4,261 3,100 4,261 3,100    
Individually evaluated for impairment         360 400
Collectively evaluated for impairment         3,901 2,700
Ending balance 4,202 3,113 4,261 3,100 4,261 3,100
Residential Portfolio Segment [Member]            
Balance 1,061 1,082 1,268 1,259    
Loans charged-off    
Recoveries of loans previously charged-off 2 2 5 5    
Net loans (charged-off) recoveries 2 2 5 5    
Provision for credit losses 47 (18) (163) (198)    
Balance 1,110 1,066 1,110 1,066    
Individually evaluated for impairment        
Collectively evaluated for impairment         1,110 1,066
Ending balance 1,061 1,082 1,110 1,066 1,110 1,066
Construction Portfolio Segment [Member]            
Balance 17,024 17,633 21,088 15,625    
Loans charged-off    
Recoveries of loans previously charged-off 3 10 207 114    
Net loans (charged-off) recoveries 3 10 207 114    
Provision for credit losses (513) 1,281 (4,781) 3,185    
Balance 16,514 18,924 16,514 18,924    
Individually evaluated for impairment         300 350
Collectively evaluated for impairment         16,214 18,574
Ending balance 17,024 17,633 16,514 18,924 16,514 18,924
Home Equity Portfolio Segment [Member]            
Balance 1,556 1,496 1,292 1,469    
Loans charged-off (121) (225) (217) (644)    
Recoveries of loans previously charged-off 3 1 11 5    
Net loans (charged-off) recoveries (118) (224) (206) (639)    
Provision for credit losses (69) 334 283 776    
Balance 1,369 1,606 1,369 1,606    
Individually evaluated for impairment         338
Collectively evaluated for impairment         1,369 1,268
Ending balance 1,556 1,496 1,369 1,606 1,369 1,606
Other Consumer Portfolio Segment [Member]            
Balance 235 275 75 104    
Loans charged-off (12) (95) (37) (182)    
Recoveries of loans previously charged-off 8 18 24 85    
Net loans (charged-off) recoveries (4) (77) (13) (97)    
Provision for credit losses 109 71 278 262    
Balance 340 269 340 269    
Individually evaluated for impairment         100
Collectively evaluated for impairment         240 269
Ending balance 235 275 340 269 340 269
Balance 56,536 48,921 52,687 46,075    
Loans charged-off (1,993) (1,962) (5,398) (6,170)    
Recoveries of loans previously charged-off 33 99 356 372    
Net loans (charged-off) recoveries (1,960) (1,863) (5,042) (5,798)    
Provision for credit losses 2,288 3,262 9,219 10,043    
Balance 56,864 50,320 56,864 50,320    
Individually evaluated for impairment         4,471 4,227
Collectively evaluated for impairment         52,393 46,093
Ending balance $ 56,864 $ 50,320 $ 56,864 $ 50,320 $ 56,864 $ 50,320