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Note 5 - Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Beginning balance $ 34,563 $ 21,137 $ 26,182 [1],[2] $ 18,425
(Recovery of) provision for credit losses (2,230) 3,831 (6,231) 7,331
Charge-offs (1,902) (1,672) (3,632) (2,866)
Recoveries 1,426 462 2,431 868
Net charge-offs (476) (1,210) (1,201)  
Ending balance 31,857 [2] 23,758 31,857 [2] 23,758
Net (charge-offs) recoveries       (1,998)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance     13,107  
(Recovery of) provision for credit losses (2,230)      
Commercial Portfolio Segment [Member]        
Beginning balance 19,586 12,075 14,661 10,235
(Recovery of) provision for credit losses   2,618 (4,782) 4,605
Charge-offs (1,202) (878) (1,959) (1,146)
Recoveries 1,032 94 1,424 215
Net charge-offs (170) (784) (535)  
Ending balance 17,704 13,909 17,704 13,909
Net (charge-offs) recoveries       (931)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance     8,360  
(Recovery of) provision for credit losses (1,712)      
Consumer Real Estate Portfolio Segment [Member]        
Beginning balance 11,887 7,519 8,951 6,325
(Recovery of) provision for credit losses   (221) (2,528) 924
Charge-offs (48) (179) (58) (242)
Recoveries 202 175 545 287
Net charge-offs 154 (4) 487  
Ending balance 11,055 7,294 11,055 7,294
Net (charge-offs) recoveries       45
Consumer Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance     4,145  
(Recovery of) provision for credit losses (986)      
Consumer and Other Portfolio Segment [Member]        
Beginning balance 3,090 1,543 2,570 1,865
(Recovery of) provision for credit losses   1,434 1,079 1,802
Charge-offs (652) (615) (1,615) (1,478)
Recoveries 192 193 462 366
Net charge-offs (460) (422) (1,153)  
Ending balance 3,098 $ 2,555 3,098 2,555
Net (charge-offs) recoveries       $ (1,112)
Consumer and Other Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance     $ 602  
(Recovery of) provision for credit losses $ 468      
[1] Derived from audited financial statements
[2] Effective January 1, 2021, the Company adopted the current expected credit loss methodology ("CECL"), prior to January 1, 2021, the Company utilized the incurred credit loss methodology.