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Note 6 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses by Portfolio Segment (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period $ 43,552 $ 39,640 $ 40,921 $ 37,492  
Loans charged-off (1,237) (1,420) (4,052) (5,734)  
Recoveries of loans previously charged-off 528 95 906 835  
Net loan charged-off (709) (1,325) (3,146) (4,899)  
Provision for credit losses 2,111 1,372 7,179 7,094  
Ending balance 44,954 39,687 44,954 39,687  
For the Period Ended September 30, 2014          
Individually evaluated for impairment 8,013 7,160 8,013 7,160  
Collectively evaluated for impairment 36,941 32,527 36,941 32,527  
Ending balance 44,954 39,687 44,954 39,687 40,921
Commercial Loan [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 11,413 12,177 9,780 9,412  
Loans charged-off (317) (966) (1,968) (3,380)  
Recoveries of loans previously charged-off 519 89 802 139  
Net loan charged-off 202 (877) (1,166) (3,241)  
Provision for credit losses 1,558 346 4,559 5,475  
Ending balance 13,173 11,646 13,173 11,646  
For the Period Ended September 30, 2014          
Individually evaluated for impairment 4,409 3,019 4,409 3,019  
Collectively evaluated for impairment 8,764 8,627 8,764 8,627  
Ending balance 13,173 11,646 13,173 11,646  
Commercial Real Estate Investment [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 10,745 9,615 10,359 9,148  
Loans charged-off (22) (118) (22) (227)  
Recoveries of loans previously charged-off     4    
Net loan charged-off (22) (118) (18) (227)  
Provision for credit losses 478 359 860 935  
Ending balance 11,201 9,856 11,201 9,856  
For the Period Ended September 30, 2014          
Individually evaluated for impairment 578 1,097 578 1,097  
Collectively evaluated for impairment 10,623 8,759 10,623 8,759  
Ending balance 11,201 9,856 11,201 9,856  
Commercial Real Estate Owner Occupied [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 3,273 3,024 3,899 2,781  
Loans charged-off     (35)    
Recoveries of loans previously charged-off     7    
Net loan charged-off     (28)    
Provision for credit losses 42 (37) (556) 206  
Ending balance 3,315 2,987 3,315 2,987  
For the Period Ended September 30, 2014          
Individually evaluated for impairment 1,330 823 1,330 823  
Collectively evaluated for impairment 1,985 2,164 1,985 2,164  
Ending balance 3,315 2,987 3,315 2,987  
Residential Mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 958 942 944 659  
Loans charged-off (48)   (138)    
Net loan charged-off (48)   (138)    
Provision for credit losses 70 (332) 174 (49)  
Ending balance 980 610 980 610  
For the Period Ended September 30, 2014          
Individually evaluated for impairment   27   27  
Collectively evaluated for impairment 980 583 980 583  
Ending balance 980 610 980 610  
Home Equity Line of Credit [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 1,331 1,765 1,871 1,730  
Loans charged-off (230) (25) (379) (54)  
Recoveries of loans previously charged-off 2   8 9  
Net loan charged-off (228) (25) (371) (45)  
Provision for credit losses 259 5 (138) 60  
Ending balance 1,362 1,745 1,362 1,745  
For the Period Ended September 30, 2014          
Individually evaluated for impairment 218 373 218 373  
Collectively evaluated for impairment 1,144 1,372 1,144 1,372  
Ending balance 1,362 1,745 1,362 1,745  
Consumer, Other [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 345 369 134 371  
Loans charged-off   (11) (84) (63)  
Recoveries of loans previously charged-off 1   8 6  
Net loan charged-off 1 (11) (76) (57)  
Provision for credit losses (59) 5 229 49  
Ending balance 287 363 287 363  
For the Period Ended September 30, 2014          
Individually evaluated for impairment   45   45  
Collectively evaluated for impairment 287 318 287 318  
Ending balance 287 363 287 363  
Construction Loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Balance at beginning of period 15,487 11,748 13,934 13,391  
Loans charged-off (620) (300) (1,426) (2,010)  
Recoveries of loans previously charged-off 6 6 77 681  
Net loan charged-off (614) (294) (1,349) (1,329)  
Provision for credit losses (237) 1,026 2,051 418  
Ending balance 14,636 12,480 14,636 12,480  
For the Period Ended September 30, 2014          
Individually evaluated for impairment 1,478 1,776 1,478 1,776  
Collectively evaluated for impairment 13,158 10,704 13,158 10,704  
Ending balance $ 14,636 $ 12,480 $ 14,636 $ 12,480