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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 ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]          
Provision for loan losses $ (600,000) $ (700,000) $ (1,000,000) $ (2,600,000)  
Loans 2,171,832,000   2,171,832,000   $ 2,089,277,000
Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 1,429,623,000   1,429,623,000    
Loans: individually evaluated for impairment 20,288,000   20,288,000    
Loans: collectively evaluated for impairment 1,409,335,000   1,409,335,000    
Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 20,251,000 20,954,000 19,299,000 22,821,000  
Allowance for loan losses 15,740,000 20,856,000 15,740,000 20,856,000  
Allowance for loan losses: individually evaluated for impairment 2,324,000 10,362,000 2,324,000 10,362,000  
Allowance for loan losses: collectively evaluated for impairment 13,416,000 10,494,000 13,416,000 10,494,000  
Provision for loan losses (643,000) (700,000) (1,101,000) (2,600,000)  
Charge-offs (4,353,000) (103,000) (4,794,000) (691,000)  
Recoveries 485,000 705,000 2,336,000 1,326,000  
Loans 1,429,623,000 1,145,097,000 1,429,623,000 1,145,097,000 1,246,116,000
Loans: individually evaluated for impairment   30,604,000   30,604,000  
Loans: collectively evaluated for impairment   1,114,493,000   1,114,493,000  
Acquired Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 799,000   742,000    
Allowance for loan losses 821,000   821,000    
Provision for loan losses 43,000   101,000    
Charge-offs (30,000)   (38,000)    
Recoveries 9,000   16,000    
Loans 742,209,000   742,209,000   843,161,000
Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 1,820,431,000   1,820,431,000   1,715,303,000
Commercial Portfolio Segment [Member] | Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 1,322,388,000   1,322,388,000    
Loans: individually evaluated for impairment 19,108,000   19,108,000    
Loans: collectively evaluated for impairment 1,303,280,000   1,303,280,000    
Commercial Portfolio Segment [Member] | Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 18,977,000 19,001,000 17,736,000 20,455,000  
Allowance for loan losses 13,992,000 19,107,000 13,992,000 19,107,000  
Allowance for loan losses: individually evaluated for impairment 2,146,000 9,440,000 2,146,000 9,440,000  
Allowance for loan losses: collectively evaluated for impairment 11,846,000 9,667,000 11,846,000 9,667,000  
Provision for loan losses (1,151,000) (334,000) (1,651,000) (1,788,000)  
Charge-offs (4,199,000) (98,000) (4,277,000) (684,000)  
Recoveries 365,000 538,000 2,184,000 1,124,000  
Loans 1,322,388,000 1,076,609,000 1,322,388,000 1,076,609,000 1,153,189,000
Loans: individually evaluated for impairment   27,199,000   27,199,000  
Loans: collectively evaluated for impairment   1,049,410,000   1,049,410,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 622,000   681,000    
Allowance for loan losses 561,000   561,000    
Provision for loan losses (31,000)   (90,000)    
Charge-offs (30,000)   (31,000)    
Recoveries 0   1,000    
Loans 498,043,000   498,043,000   562,114,000
Retail Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 351,401,000   351,401,000   373,974,000
Retail Portfolio Segment [Member] | Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 107,235,000   107,235,000    
Loans: individually evaluated for impairment 1,180,000   1,180,000    
Loans: collectively evaluated for impairment 106,055,000   106,055,000    
Retail Portfolio Segment [Member] | Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 1,235,000 1,957,000 1,487,000 2,358,000  
Allowance for loan losses 1,714,000 1,774,000 1,714,000 1,774,000  
Allowance for loan losses: individually evaluated for impairment 178,000 922,000 178,000 922,000  
Allowance for loan losses: collectively evaluated for impairment 1,536,000 852,000 1,536,000 852,000  
Provision for loan losses 513,000 (345,000) 592,000 (779,000)  
Charge-offs (154,000) (5,000) (517,000) (7,000)  
Recoveries 120,000 167,000 152,000 202,000  
Loans 107,235,000 68,488,000 107,235,000 68,488,000 92,927,000
Loans: individually evaluated for impairment   3,405,000   3,405,000  
Loans: collectively evaluated for impairment   65,083,000   65,083,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 177,000   61,000    
Allowance for loan losses 260,000   260,000    
Provision for loan losses 74,000   191,000    
Charge-offs 0   (7,000)    
Recoveries 9,000   15,000    
Loans 244,166,000   244,166,000   $ 281,047,000
Unallocated Financing Receivables [Member] | Originated Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 39,000 (4,000) 76,000 8,000  
Allowance for loan losses 34,000 (25,000) 34,000 (25,000)  
Allowance for loan losses: individually evaluated for impairment 0 0 0 0  
Allowance for loan losses: collectively evaluated for impairment 34,000 (25,000) 34,000 (25,000)  
Provision for loan losses (5,000) (21,000) (42,000) (33,000)  
Charge-offs 0 0 0 0  
Recoveries 0 $ 0 0 $ 0  
Unallocated Financing Receivables [Member] | Acquired Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for loan losses 0   0    
Allowance for loan losses 0   0    
Provision for loan losses 0   0    
Charge-offs 0   0    
Recoveries $ 0   $ 0