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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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Allowance for credit losses:    
Balance at beginning of period $ 37,492 $ 29,653
Loans charged-off (7,039) (9,098)
Recoveries of loans previously charged-off 866 747
Net loan charged-off (6,173) (8,351)
Provision for credit losses 9,602 16,190
Ending balance 40,921 37,492
Allowance for credit losses:    
Individually evaluated for impairment 6,520 8,114
Collectively evaluated for impairment 34,401 29,378
Ending balance 40,921 37,492
Commercial Loan [Member]
    
Allowance for credit losses:    
Balance at beginning of period 9,412 9,609
Loans charged-off (4,275) (3,481)
Recoveries of loans previously charged-off 161 144
Net loan charged-off (4,114) (3,337)
Provision for credit losses 4,482 3,140
Ending balance 9,780 9,412
Allowance for credit losses:    
Individually evaluated for impairment 1,323 2,158
Collectively evaluated for impairment 8,457 7,254
Ending balance 9,780 9,412
Commercial Real Estate Investment [Member]
    
Allowance for credit losses:    
Balance at beginning of period 9,148 7,304
Loans charged-off (602) (1,189)
Recoveries of loans previously charged-off   18
Net loan charged-off (602) (1,171)
Provision for credit losses 1,813 3,015
Ending balance 10,359 9,148
Allowance for credit losses:    
Individually evaluated for impairment 1,098 1,201
Collectively evaluated for impairment 9,261 7,947
Ending balance 10,359 9,148
Commercial Real Estate Owner Occupied [Member]
    
Allowance for credit losses:    
Balance at beginning of period 2,781 1,898
Loans charged-off   (350)
Net loan charged-off   (350)
Provision for credit losses 1,118 1,233
Ending balance 3,899 2,781
Allowance for credit losses:    
Individually evaluated for impairment 1,853 753
Collectively evaluated for impairment 2,046 2,028
Ending balance 3,899 2,781
Residential Mortgage [Member]
    
Allowance for credit losses:    
Balance at beginning of period 659 399
Loans charged-off   (300)
Net loan charged-off   (300)
Provision for credit losses 285 560
Ending balance 944 659
Allowance for credit losses:    
Individually evaluated for impairment 27  
Collectively evaluated for impairment 917 659
Ending balance 944 659
Home Equity Line of Credit [Member]
    
Allowance for credit losses:    
Balance at beginning of period 1,730 1,528
Loans charged-off (89) (698)
Recoveries of loans previously charged-off 11 73
Net loan charged-off (78) (625)
Provision for credit losses 219 827
Ending balance 1,871 1,730
Allowance for credit losses:    
Individually evaluated for impairment 526 243
Collectively evaluated for impairment 1,345 1,487
Ending balance 1,871 1,730
Consumer, Other [Member]
    
Allowance for credit losses:    
Balance at beginning of period 371 369
Loans charged-off (63) (47)
Recoveries of loans previously charged-off 6 2
Net loan charged-off (57) (45)
Provision for credit losses (180) 47
Ending balance 134 371
Allowance for credit losses:    
Individually evaluated for impairment 68 41
Collectively evaluated for impairment 66 330
Ending balance 134 371
Construction Loans [Member]
    
Allowance for credit losses:    
Balance at beginning of period 13,391 8,546
Loans charged-off (2,010) (3,033)
Recoveries of loans previously charged-off 688 510
Net loan charged-off (1,322) (2,523)
Provision for credit losses 1,865 7,368
Ending balance 13,934 13,391
Allowance for credit losses:    
Individually evaluated for impairment 1,625 3,718
Collectively evaluated for impairment 12,309 9,673
Ending balance $ 13,934 $ 13,391