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Note 3 - Loans and Allowance for Loan Losses (Details) - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Allowance for loan losses:      
Beginning balance $ 22,821,000 $ 28,677,000  
Ending balance 20,954,000 26,035,000  
Ending balance: individually evaluated for impairment 10,479,000 14,893,000  
Ending balance: collectively evaluated for impairment 10,475,000 11,142,000  
Provision for loan losses (1,900,000) (1,500,000)  
Charge-offs (588,000) (2,415,000)  
Recoveries 621,000 1,273,000  
Total loans:      
Ending balance 1,066,796,000 1,022,956,000 1,053,243,000
Ending balance: individually evaluated for impairment 33,395,000 51,700,000  
Ending balance: collectively evaluated for impairment 1,033,401,000 971,256,000  
Commercial Loans [Member]
      
Allowance for loan losses:      
Beginning balance 20,455,000 26,043,000  
Ending balance 19,001,000 23,717,000  
Ending balance: individually evaluated for impairment 9,508,000 14,616,000  
Ending balance: collectively evaluated for impairment 9,493,000 9,101,000  
Provision for loan losses (1,454,000) (1,164,000)  
Charge-offs (586,000) (2,412,000)  
Recoveries 586,000 1,250,000  
Total loans:      
Ending balance 1,004,218,000 948,964,000  
Ending balance: individually evaluated for impairment 29,883,000 49,636,000  
Ending balance: collectively evaluated for impairment 974,335,000 899,328,000  
Retail Loans [Member]
      
Allowance for loan losses:      
Beginning balance 2,358,000 2,645,000  
Ending balance 1,957,000 2,302,000  
Ending balance: individually evaluated for impairment 971,000 277,000  
Ending balance: collectively evaluated for impairment 986,000 2,025,000  
Provision for loan losses (434,000) (363,000)  
Charge-offs (2,000) (3,000)  
Recoveries 35,000 23,000  
Total loans:      
Ending balance 62,578,000 73,992,000  
Ending balance: individually evaluated for impairment 3,512,000 2,064,000  
Ending balance: collectively evaluated for impairment 59,066,000 71,928,000  
Unallocated Loans [Member]
      
Allowance for loan losses:      
Beginning balance 8,000 (11,000)  
Ending balance (4,000) 16,000  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment (4,000) 16,000  
Provision for loan losses (12,000) 27,000  
Charge-offs 0 0  
Recoveries $ 0 $ 0