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Note 4 - Loans and Allowance for Loan Losses (Details) - Activity in Allowance for Loan Losses and the Recorded Investments in Loans - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Provision for loan losses $ (1,000,000) $ (3,000,000) $ (7,200,000)
Total loans:      
Loans 2,277,727,000 2,089,277,000  
Originated Loan [Member]      
Total loans:      
Loans 1,616,587,000    
Loans: individually evaluated for impairment 18,197,000    
Loans: collectively evaluated for impairment 1,598,390,000    
Originated Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 19,299,000 22,821,000 28,677,000
Provision for loan losses (701,000) (3,793,000) (7,200,000)
Charge-offs (6,195,000) (1,430,000) (5,290,000)
Recoveries 2,830,000 1,701,000 6,634,000
Allowance for loan losses 15,233,000 19,299,000 22,821,000
Allowance for loan losses: individually evaluated for impairment 1,474,000 10,152,000 12,386,000
Allowance for loan losses: collectively evaluated for impairment 13,759,000 9,147,000 10,435,000
Total loans:      
Loans 1,616,587,000 1,246,116,000 1,053,243,000
Loans: individually evaluated for impairment   47,856,000 36,868,000
Loans: collectively evaluated for impairment   1,198,260,000 1,016,375,000
Acquired Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 742,000 0  
Provision for loan losses (299,000) 793,000  
Charge-offs (84,000) (71,000)  
Recoveries 89,000 20,000  
Allowance for loan losses 448,000 742,000 0
Total loans:      
Loans 661,140,000 843,161,000  
Commercial Portfolio Segment [Member]      
Total loans:      
Loans 1,946,696,000 1,715,303,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Total loans:      
Loans 1,493,516,000    
Loans: individually evaluated for impairment 16,845,000    
Loans: collectively evaluated for impairment 1,476,671,000    
Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 17,736,000 20,455,000 26,043,000
Provision for loan losses (1,771,000) (3,140,000) (6,730,000)
Charge-offs (4,915,000) (876,000) (5,120,000)
Recoveries 2,622,000 1,297,000 6,262,000
Allowance for loan losses 13,672,000 17,736,000 20,455,000
Allowance for loan losses: individually evaluated for impairment 1,218,000 9,374,000 11,260,000
Allowance for loan losses: collectively evaluated for impairment 12,454,000 8,362,000 9,195,000
Total loans:      
Loans 1,493,516,000 1,153,189,000 986,696,000
Loans: individually evaluated for impairment   45,021,000 33,240,000
Loans: collectively evaluated for impairment   1,108,168,000 953,456,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 681,000 0  
Provision for loan losses (617,000) 734,000  
Charge-offs (77,000) (55,000)  
Recoveries 45,000 2,000  
Allowance for loan losses 32,000 681,000 0
Total loans:      
Loans 453,180,000 562,114,000  
Retail Portfolio Segment [Member]      
Total loans:      
Loans 331,031,000 373,974,000  
Retail Portfolio Segment [Member] | Originated Loan [Member]      
Total loans:      
Loans 123,071,000    
Loans: individually evaluated for impairment 1,352,000    
Loans: collectively evaluated for impairment 121,719,000    
Retail Portfolio Segment [Member] | Originated Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 1,487,000 2,358,000 2,645,000
Provision for loan losses 1,006,000 (721,000) (489,000)
Charge-offs (1,280,000) (554,000) (170,000)
Recoveries 208,000 404,000 372,000
Allowance for loan losses 1,421,000 1,487,000 2,358,000
Allowance for loan losses: individually evaluated for impairment 256,000 778,000 1,126,000
Allowance for loan losses: collectively evaluated for impairment 1,165,000 709,000 1,232,000
Total loans:      
Loans 123,071,000 92,927,000 66,547,000
Loans: individually evaluated for impairment   2,835,000 3,628,000
Loans: collectively evaluated for impairment   90,092,000 62,919,000
Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 61,000 0  
Provision for loan losses 318,000 59,000  
Charge-offs (7,000) (16,000)  
Recoveries 44,000 18,000  
Allowance for loan losses 416,000 61,000 0
Total loans:      
Loans 207,960,000 281,047,000  
Unallocated Financing Receivables [Member] | Originated Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 76,000 8,000 (11,000)
Provision for loan losses 64,000 68,000 19,000
Charge-offs 0 0 0
Recoveries 0 0 0
Allowance for loan losses 140,000 76,000 8,000
Allowance for loan losses: individually evaluated for impairment 0 0 0
Allowance for loan losses: collectively evaluated for impairment 140,000 76,000 8,000
Unallocated Financing Receivables [Member] | Acquired Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses 0 0  
Provision for loan losses 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for loan losses $ 0 $ 0 $ 0