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Note 3 - Loans - Impaired Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Recorded investment, with no related allowance recorded $ 2,217 $ 2,554
Unpaid principal balance, with no related allowance recorded 2,213 2,557
Average recorded investment, with no related allowance recorded 2,584 2,089
Interest income recognized, with no related allowance recorded 57 173
Recorded investment, with a related allowance recorded   298
Unpaid principal balance, with a related allowance recorded   292
Related allowance   30
Average recorded investment, with a related allowance recorded   818
Interest income recognized, with a related allowance recorded   39
Recorded investment   2,852
Unpaid principal balance   2,849
Average recorded investment   2,907
Interest income recognized   212
Commercial Portfolio Segment [Member]    
Recorded investment, with no related allowance recorded 0 18
Unpaid principal balance, with no related allowance recorded 0 18
Average recorded investment, with no related allowance recorded 5 23
Interest income recognized, with no related allowance recorded 0 6
Recorded investment, with a related allowance recorded 16 39
Unpaid principal balance, with a related allowance recorded 9 33
Related allowance 9 29
Average recorded investment, with a related allowance recorded 28 382
Interest income recognized, with a related allowance recorded 1 15
Recorded investment 16 57
Unpaid principal balance 9 51
Average recorded investment 33 405
Interest income recognized 1 21
Commercial Real Estate Portfolio Segment [Member] | Construction and Land Development [Member]    
Recorded investment, with no related allowance recorded 0 0
Unpaid principal balance, with no related allowance recorded 0 0
Average recorded investment, with no related allowance recorded 0 0
Interest income recognized, with no related allowance recorded 0 0
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 0 0
Unpaid principal balance 0 0
Average recorded investment 0 0
Interest income recognized 0 0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]    
Recorded investment, with no related allowance recorded 14 286
Unpaid principal balance, with no related allowance recorded 11 283
Average recorded investment, with no related allowance recorded 87 357
Interest income recognized, with no related allowance recorded 1 27
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 14 286
Unpaid principal balance 11 283
Average recorded investment 87 357
Interest income recognized 1 27
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]    
Recorded investment, with no related allowance recorded 1,027 1,148
Unpaid principal balance, with no related allowance recorded 1,026 1,147
Average recorded investment, with no related allowance recorded 1,087 766
Interest income recognized, with no related allowance recorded 22 75
Recorded investment, with a related allowance recorded 0 122 [1]
Unpaid principal balance, with a related allowance recorded 0 122 [1]
Related allowance 0 0 [1]
Average recorded investment, with a related allowance recorded 31 180 [1]
Interest income recognized, with a related allowance recorded 0 15 [1]
Recorded investment 1,027 1,270
Unpaid principal balance 1,026 1,269
Average recorded investment 1,118 946
Interest income recognized 22 90
Residential Portfolio Segment [Member] | Residential [Member]    
Recorded investment, with no related allowance recorded 1,139 1,096
Unpaid principal balance, with no related allowance recorded 1,146 1,103
Average recorded investment, with no related allowance recorded 1,265 912
Interest income recognized, with no related allowance recorded 31 62
Recorded investment, with a related allowance recorded 16 137
Unpaid principal balance, with a related allowance recorded 16 137
Related allowance 1 1
Average recorded investment, with a related allowance recorded 76 256
Interest income recognized, with a related allowance recorded 2 9
Recorded investment 1,155 1,233
Unpaid principal balance 1,162 1,240
Average recorded investment 1,341 1,168
Interest income recognized 33 71
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]    
Recorded investment, with no related allowance recorded 5 6
Unpaid principal balance, with no related allowance recorded 5 6
Average recorded investment, with no related allowance recorded 5 31
Interest income recognized, with no related allowance recorded 0 3
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 5 6
Unpaid principal balance 5 6
Average recorded investment 5 31
Interest income recognized 0 3
Consumer Portfolio Segment [Member]    
Recorded investment, with no related allowance recorded 0 0
Unpaid principal balance, with no related allowance recorded 0 0
Average recorded investment, with no related allowance recorded 0 0
Interest income recognized, with no related allowance recorded 0 0
Recorded investment, with a related allowance recorded 0 0
Unpaid principal balance, with a related allowance recorded 0 0
Related allowance 0 0
Average recorded investment, with a related allowance recorded 0 0
Interest income recognized, with a related allowance recorded 0 0
Recorded investment 0 0
Unpaid principal balance 0 0
Average recorded investment 0 0
Interest income recognized $ 0 $ 0
[1] Allowance is reported as zero in the table due to presentation in thousands and rounding.