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Loans and allowance for loan losses - Loans individually evaluated for impairment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Recorded Investment |  |  |  |  |
With no related allowance recorded, Recorded investment | $ 1,135 |  | $ 1,135 |  | $ 1,447
With a related allowance recorded, Recorded investment | 844 |  | 844 |  | 1,075
Total | 1,979 |  | 1,979 |  | 2,522
Unpaid principal balance |  |  |  |  |
With no related allowance recorded, Unpaid principal balance | 1,457 |  | 1,457 |  | 1,775
With a related allowance recorded, Unpaid principal balance | 854 |  | 854 |  | 1,120
Total | 2,311 |  | 2,311 |  | 2,895
With a related allowance recorded, Related allowance | 124 |  | 124 |  | 150
Average recorded investment |  |  |  |  |
With no related allowance recorded, Average recorded investment | 1,141 | $ 974 | 1,155 | $ 988 |
With a related allowance recorded, Average recorded investment | 850 | 1,092 | 860 | 1,100 |
Total | 1,991 | 2,066 | 2,015 | 2,088 |
Interest income recognized |  |  |  |  |
With no related allowance recorded, Interest income recognized | 15 | 13 | 52 | 39 |
With a related allowance recorded, Interest income recognized | 10 | 13 | 29 | 37 |
Total | 25 | $ 26 | 81 | 76 |
First mortgage loans | 1-4 family residential |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded, Recorded investment | 1,135 |  | 1,135 |  | 1,348
With a related allowance recorded, Recorded investment | 844 |  | 844 |  | 1,075
Unpaid principal balance |  |  |  |  |
With no related allowance recorded, Unpaid principal balance | 1,457 |  | 1,457 |  | 1,676
With a related allowance recorded, Unpaid principal balance | 854 |  | 854 |  | 1,120
With a related allowance recorded, Related allowance | $ 124 |  | 124 |  | 150
Average recorded investment |  |  |  |  |
With no related allowance recorded, Average recorded investment |  |  | 1,155 | 988 |
With a related allowance recorded, Average recorded investment |  |  | 860 | 1,100 |
Interest income recognized |  |  |  |  |
With no related allowance recorded, Interest income recognized |  |  | 52 | 39 |
With a related allowance recorded, Interest income recognized |  |  | $ 29 | $ 37 |
Consumer loans |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded, Recorded investment |  |  |  |  | 99
Unpaid principal balance |  |  |  |  |
With no related allowance recorded, Unpaid principal balance |  |  |  |  | $ 99

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