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Note 5 - Loans and Allowance for Loan Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance, beginning of period $ 36,286,000    
Provision for loan losses 26,393,000 $ 20,065,000 $ 9,022,000
Balance, end of period 41,668,000 36,286,000  
Loans, Excluding Acquired Loans [Member]      
Balance, beginning of period 36,286,000 [1] 31,351,000 [1] 29,028,000
Provision for loan losses 24,527,000 [2] 19,439,000 [2] 8,286,000
Charge-offs (23,498,000) (16,643,000) (7,774,000)
Recoveries 4,353,000 2,139,000 1,811,000
Net charge-offs (19,145,000) (14,504,000) (5,963,000)
Balance, end of period [1] 41,668,000 36,286,000 31,351,000
Loans individually evaluated for impairment 338,000 680,000  
Loans collectively evaluated for impairment 41,330,000 35,606,000  
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]      
Balance, beginning of period 7,739,000 [1] 5,985,000 [1] 6,962,000
Provision for loan losses 7,002,000 [2] 5,345,000 [2] 258,000
Charge-offs (7,837,000) (3,956,000) (1,415,000)
Recoveries 103,000 365,000 180,000
Net charge-offs (7,734,000) (3,591,000) (1,235,000)
Balance, end of period [1] 7,007,000 7,739,000 5,985,000
Loans individually evaluated for impairment 262,000  
Loans collectively evaluated for impairment 7,007,000 7,477,000  
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]      
Balance, beginning of period 21,817,000 [1] 19,522,000 [1] 15,161,000
Provision for loan losses 12,463,000 [2] 9,461,000 [2] 5,738,000
Charge-offs (7,989,000) (7,517,000) (1,580,000)
Recoveries 990,000 351,000 203,000
Net charge-offs (6,999,000) (7,166,000) (1,377,000)
Balance, end of period [1] 27,281,000 21,817,000 19,522,000
Loans individually evaluated for impairment 338,000 417,000  
Loans collectively evaluated for impairment 26,943,000 21,400,000  
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]      
Balance, beginning of period 3,779,000 [1] 3,893,000 [1] 5,445,000
Provision for loan losses 2,889,000 [2] 2,174,000 [2] 665,000
Charge-offs (3,905,000) (3,195,000) (3,107,000)
Recoveries 1,021,000 907,000 890,000
Net charge-offs (2,884,000) (2,288,000) (2,217,000)
Balance, end of period [1] 3,784,000 3,779,000 3,893,000
Loans individually evaluated for impairment  
Loans collectively evaluated for impairment 3,784,000 3,779,000  
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]      
Balance, beginning of period 2,951,000 [1] 1,951,000 [1] 1,460,000
Provision for loan losses 2,173,000 [2] 2,459,000 [2] 1,625,000
Charge-offs (3,767,000) (1,975,000) (1,672,000)
Recoveries 2,239,000 516,000 538,000
Net charge-offs (1,528,000) (1,459,000) (1,134,000)
Balance, end of period [1] 3,596,000 2,951,000 $ 1,951,000
Loans individually evaluated for impairment 1,000  
Loans collectively evaluated for impairment $ 3,596,000 $ 2,950,000  
[1] Allowance for loan losses at December 31, 2017 includes $418,000 allowance for loans acquired (not shown in the table above). Allowance for loan losses at December 31, 2016 and 2015 includes $954,000 allowance for loans acquired. The total allowance for loan losses at December 31, 2017, 2016 and 2015 was $42,086,000, $37,240,000 and $32,305,000, respectively.
[2] Provision for loan losses of $1,866,000 attributable to loans acquired was excluded from this table for the year ended December 31, 2017 (total provision for loan losses for the year ended December 31, 2017 was $26,393,000). There was $2.4 million in charge-offs for loans acquired during the year ended December 31, 2017 resulting in an ending balance in the allowance related to loans acquired of $418,000. Provision for loan losses of $626,000 attributable to loans acquired was excluded from this table for the year ended December 31, 2016 (total provision for loan losses for the year ended December 31, 2016 was $20,065,000). The $626,000 was subsequently charged-off, resulting in no increase to the ending balance in the allowance related to loans acquired.