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Note 5 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses by Portfolio Segment - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Allowance for credit losses:          
Balance at beginning of period $ 47,779 $ 42,018 $ 46,075 $ 40,921  
Loans charged-off (2,402) (1,690) (4,208) (2,815)  
Recoveries of loans previously charged-off 73 90 273 378  
Net loan charged-off (2,329) (1,600) (3,935) (2,437)  
Provision for credit losses 3,471 3,134 6,781 5,068  
Ending balance 48,921 43,552 48,921 43,552  
Allowance for credit losses:          
Individually evaluated for impairment 6,039 7,148 6,039 7,148  
Collectively evaluated for impairment 42,882 36,404 42,882 36,404  
Ending balance-Allowance for credit losses 48,921 43,552 48,921 43,552 $ 46,075
Commercial Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 13,777 11,420 13,222 9,780  
Loans charged-off (2,307) (1,378) (3,305) (1,651)  
Recoveries of loans previously charged-off 24 72 75 283  
Net loan charged-off (2,283) (1,306) (3,230) (1,368)  
Provision for credit losses 1,417 1,299 2,919 3,001  
Ending balance 12,911 11,413 12,911 11,413  
Allowance for credit losses:          
Individually evaluated for impairment 4,066 3,501 4,066 3,501  
Collectively evaluated for impairment 8,845 7,912 8,845 7,912  
Ending balance-Allowance for credit losses 12,911 11,413 12,911 11,413  
Income Producing Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 11,652 10,590 11,442 10,359  
Loans charged-off (79)   (397)    
Recoveries of loans previously charged-off 18 4 18 4  
Net loan charged-off (61) 4 (379) 4  
Provision for credit losses 820 151 1,348 382  
Ending balance 12,411 10,745 12,411 10,745  
Allowance for credit losses:          
Individually evaluated for impairment 491 732 491 732  
Collectively evaluated for impairment 11,920 10,013 11,920 10,013  
Ending balance-Allowance for credit losses 12,411 10,745 12,411 10,745  
Owner Occupied Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 3,127 3,195 2,954 3,899  
Loans charged-off       (35)  
Recoveries of loans previously charged-off 1 7 2 7  
Net loan charged-off 1 7 2 (28)  
Provision for credit losses (15) 71 157 (598)  
Ending balance 3,113 3,273 3,113 3,273  
Allowance for credit losses:          
Individually evaluated for impairment 386 1,102 386 1,102  
Collectively evaluated for impairment 2,727 2,171 2,727 2,171  
Ending balance-Allowance for credit losses 3,113 3,273 3,113 3,273  
Residential Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 1,055 754 1,259 944  
Loans charged-off   (28)   (90)  
Recoveries of loans previously charged-off 1   3    
Net loan charged-off 1 (28) 3 (90)  
Provision for credit losses 26 232 (180) 104  
Ending balance 1,082 958 1,082 958  
Allowance for credit losses:          
Collectively evaluated for impairment 1,082 958 1,082 958  
Ending balance-Allowance for credit losses 1,082 958 1,082 958  
Construction Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 16,383 14,179 15,625 13,934  
Loans charged-off   (225)   (806)  
Recoveries of loans previously charged-off 9 6 104 71  
Net loan charged-off 9 (219) 104 (735)  
Provision for credit losses 1,241 1,527 1,904 2,288  
Ending balance 17,633 15,487 17,633 15,487  
Allowance for credit losses:          
Individually evaluated for impairment 803 1,605 803 1,605  
Collectively evaluated for impairment 16,830 13,882 16,830 13,882  
Ending balance-Allowance for credit losses 17,633 15,487 17,633 15,487  
Home Equity Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 1,509 1,507 1,469 1,871  
Loans charged-off     (419) (149)  
Recoveries of loans previously charged-off 2 1 4 6  
Net loan charged-off 2 1 (415) (143)  
Provision for credit losses (15) (177) 442 (397)  
Ending balance 1,496 1,331 1,496 1,331  
Allowance for credit losses:          
Individually evaluated for impairment 293 208 293 208  
Collectively evaluated for impairment 1,203 1,123 1,203 1,123  
Ending balance-Allowance for credit losses 1,496 1,331 1,496 1,331  
Other Consumer Portfolio Segment [Member]          
Allowance for credit losses:          
Balance at beginning of period 276 373 104 134  
Loans charged-off (16) (59) (87) (84)  
Recoveries of loans previously charged-off 18   67 7  
Net loan charged-off 2 (59) (20) (77)  
Provision for credit losses (3) 31 191 288  
Ending balance 275 345 275 345  
Allowance for credit losses:          
Collectively evaluated for impairment 275 345 275 345  
Ending balance-Allowance for credit losses $ 275 $ 345 $ 275 $ 345