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Note 4 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses by Portfolio Segment (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Allowance for credit losses:      
Balance at beginning of period $ 40,921 $ 37,492  
Loans charged-off (1,125) (2,083)  
Recoveries of loans previously charged-off 288 37  
Net loan charged-off (837) (2,046)  
Provision for credit losses 1,934 3,365  
Ending balance 42,018 38,811  
Allowance for credit losses:      
Individually evaluated for impairment 7,888 7,458  
Collectively evaluated for impairment 34,130 31,353  
Ending balance 42,018 38,811 40,921
Commercial Loan [Member]
      
Allowance for credit losses:      
Balance at beginning of period 9,780 9,412  
Loans charged-off (273) (1,184)  
Recoveries of loans previously charged-off 211 26  
Net loan charged-off (62) (1,158)  
Provision for credit losses 1,702 2,821  
Ending balance 11,420 11,075  
Allowance for credit losses:      
Individually evaluated for impairment 3,810 2,360  
Collectively evaluated for impairment 7,610 8,715  
Ending balance 11,420 11,075  
Commercial Real Estate Investment [Member]
      
Allowance for credit losses:      
Balance at beginning of period 10,359 9,148  
Loans charged-off   (109)  
Net loan charged-off   (109)  
Provision for credit losses 231 (32)  
Ending balance 10,590 9,007  
Allowance for credit losses:      
Individually evaluated for impairment 732 818  
Collectively evaluated for impairment 9,858 8,189  
Ending balance 10,590 9,007  
Commercial Real Estate Owner Occupied [Member]
      
Allowance for credit losses:      
Balance at beginning of period 3,899 2,781  
Loans charged-off (35)    
Net loan charged-off (35)    
Provision for credit losses (669) 23  
Ending balance 3,195 2,804  
Allowance for credit losses:      
Individually evaluated for impairment 1,105 704  
Collectively evaluated for impairment 2,090 2,100  
Ending balance 3,195 2,804  
Residential Mortgage [Member]
      
Allowance for credit losses:      
Balance at beginning of period 944 659  
Loans charged-off (62)    
Net loan charged-off (62)    
Provision for credit losses (128) 218  
Ending balance 754 877  
Allowance for credit losses:      
Individually evaluated for impairment 30    
Collectively evaluated for impairment 724 877  
Ending balance 754 877  
Home Equity Line of Credit [Member]
      
Allowance for credit losses:      
Balance at beginning of period 1,871 1,730  
Loans charged-off (149) (29)  
Recoveries of loans previously charged-off 5    
Net loan charged-off (144) (29)  
Provision for credit losses (220) 51  
Ending balance 1,507 1,752  
Allowance for credit losses:      
Individually evaluated for impairment 378 218  
Collectively evaluated for impairment 1,129 1,534  
Ending balance 1,507 1,752  
Consumer, Other [Member]
      
Allowance for credit losses:      
Balance at beginning of period 134 371  
Loans charged-off (25) (42)  
Recoveries of loans previously charged-off 7 5  
Net loan charged-off (18) (37)  
Provision for credit losses 257 17  
Ending balance 373 351  
Allowance for credit losses:      
Individually evaluated for impairment 58    
Collectively evaluated for impairment 315 351  
Ending balance 373 351  
Construction Loans [Member]
      
Allowance for credit losses:      
Balance at beginning of period 13,934 13,391  
Loans charged-off (581) (719)  
Recoveries of loans previously charged-off 65 6  
Net loan charged-off (516) (713)  
Provision for credit losses 761 267  
Ending balance 14,179 12,945  
Allowance for credit losses:      
Individually evaluated for impairment 1,775 3,358  
Collectively evaluated for impairment 12,404 9,587  
Ending balance $ 14,179 $ 12,945