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Note 5 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance $ 27,858 [1] $ 26,182
Provision for (recovery of) credit losses 1,961 (4,001)
Charge-offs (1,302) (1,730)
Recoveries 464 1,005
Net charge-offs (838) (725)
Balance 28,981 34,563
Net charge-offs (838) (725)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance   13,107
Commercial Portfolio Segment [Member]    
Balance 14,775 14,661
Provision for (recovery of) credit losses 1,108 (3,070)
Charge-offs (257) (757)
Recoveries 270 392
Net charge-offs 13 (365)
Balance 15,896 19,586
Net charge-offs 13 (365)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance   8,360
Consumer Real Estate Portfolio Segment [Member]    
Balance 9,972 8,951
Provision for (recovery of) credit losses (241) (1,542)
Charge-offs (6) (10)
Recoveries 39 343
Net charge-offs 33 333
Balance 9,764 11,887
Net charge-offs 33 333
Consumer Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance   4,145
Consumer and Other Portfolio Segment [Member]    
Balance 3,111 2,570
Provision for (recovery of) credit losses 1,094 611
Charge-offs (1,039) (963)
Recoveries 155 270
Net charge-offs (884) (693)
Balance 3,321 3,090
Net charge-offs $ (884) (693)
Consumer and Other Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance   $ 602
[1] Derived from audited financial statements