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Note 4 - Loans, Allowance for Loan Losses and Other Real Estate Owned - Allowance for Loan Losses (3) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total allowance for credit losses $ 19,484 $ 21,351 $ 23,009
Provision (reversal) 4,307 0 0
Chargeoffs (4,199) (4,570) (4,877)
Recoveries 2,245 2,703 3,219
Total allowance for credit losses 23,854 19,484 21,351
Unallocated Financing Receivable [Member]      
Total allowance for credit losses 3,701 3,177 3,666
Provision (reversal) 0 524 (489)
Chargeoffs 0 0 0
Recoveries 0 0 0
Total allowance for credit losses 0 3,701 3,177
Commercial Portfolio Segment [Member]      
Total allowance for credit losses 4,959 6,311 7,746
Provision (reversal) 746 (2,023) (2,369)
Chargeoffs (236) (97) (513)
Recoveries 351 768 1,447
Total allowance for credit losses 9,205 4,959 6,311
Commercial Real Estate Portfolio Segment [Member]      
Total allowance for credit losses 4,064 3,884 3,849
Provision (reversal) 929 (16) 275
Chargeoffs 0 0 (240)
Recoveries 49 196 0
Total allowance for credit losses 5,660 4,064 3,884
Construction Portfolio Segment [Member]      
Total allowance for credit losses 109 1,465 335
Provision (reversal) (72) (1,356) 1,130
Chargeoffs 0 0 0
Recoveries 0 0 0
Total allowance for credit losses 6 109 1,465
Residential Portfolio Segment [Member]      
Total allowance for credit losses 206 869 995
Provision (reversal) (27) (663) (126)
Chargeoffs 0 0 0
Recoveries 0 0 0
Total allowance for credit losses 47 206 869
Consumer Portfolio Segment [Member]      
Total allowance for credit losses 6,445 5,645 6,418
Provision (reversal) 2,731 3,534 1,579
Chargeoffs (3,963) (4,473) (4,124)
Recoveries 1,845 1,739 1,772
Total allowance for credit losses $ 8,936 $ 6,445 $ 5,645