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Loans, net and allowance for loan losses - Summarized Information in Concerning to Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired |  |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 4,267 | $ 5,377 |  | $ 4,267 | $ 5,377 | $ 5,820
Unpaid Principal Balance, With no related allowance, Total | 5,652 | 7,119 |  | 5,652 | 7,119 | 7,769
Average Recorded Investment, With no related allowance, Total | 4,733 | 5,809 |  | 5,113 | 6,612 | 6,453
Interest Income Recognized, With no related allowance, Total | 11 | 11 |  | 43 | 68 | 79
Recorded Investment, With an allowance recorded, Total | 1,398 | 5,405 |  | 1,398 | 5,405 | 4,086
Unpaid Principal Balance, With an allowance recorded, Total | 1,434 | 5,762 |  | 1,434 | 5,762 | 4,286
Related Allowance, With an allowance recorded, Total | 166 | 1,384 |  | 166 | 1,384 | 1,202
Average Recorded Investment, With an allowance recorded, Total | 1,749 | 5,576 |  | 2,674 | 4,416 | 4,349
Interest Income Recognized, With an allowance recorded, Total | 12 | 27 |  | 39 | 40 | 66
Recorded Investment, Total | 5,665 | 10,782 |  | 5,665 | 10,782 | 9,906
Unpaid Principal Balance, Total | 7,086 | 12,881 |  | 7,086 | 12,881 | 12,055
Average Recorded Investment, Total | 6,482 | 11,385 |  | 7,787 | 11,028 | 10,802
Interest Income Recognized, Total | 23 | 38 |  | 82 | 108 | 145
Commercial |  |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |  |
Recorded Investment, With no related allowance, Total | 634 | 2,060 |  | 634 | 2,060 | 2,251
Unpaid Principal Balance, With no related allowance, Total | 1,097 | 3,032 |  | 1,097 | 3,032 | 3,421
Average Recorded Investment, With no related allowance, Total | 870 | 2,491 |  | 1,166 | 3,081 | 2,915
Interest Income Recognized, With no related allowance, Total | 2 | 3 |  | 9 | 28 | 30
Recorded Investment, With an allowance recorded, Total | 424 | 2,679 |  | 424 | 2,679 | 2,046
Unpaid Principal Balance, With an allowance recorded, Total | 424 | 2,713 |  | 424 | 2,713 | 2,094
Related Allowance, With an allowance recorded, Total | 18 | 1,113 |  | 18 | 1,113 | 947
Average Recorded Investment, With an allowance recorded, Total | 695 | 2,583 |  | 1,354 | 2,036 | 2,038
Interest Income Recognized, With an allowance recorded, Total | 5 |  | $ 6 | 15 | 12 | 17
Recorded Investment, Total | 1,058 | 4,739 |  | 1,058 | 4,739 | 4,297
Unpaid Principal Balance, Total | 1,521 | 5,745 |  | 1,521 | 5,745 | 5,515
Average Recorded Investment, Total | 1,565 | 5,074 |  | 2,520 | 5,117 | 4,953
Interest Income Recognized, Total | 7 | 9 |  | 24 | 40 | 47
Real estate Commercial |  |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,560 | 2,146 |  | 2,560 | 2,146 | 2,372
Unpaid Principal Balance, With no related allowance, Total | 3,275 | 2,749 |  | 3,275 | 2,749 | 2,964
Average Recorded Investment, With no related allowance, Total | 2,785 | 2,094 |  | 2,805 | 2,092 | 2,148
Interest Income Recognized, With no related allowance, Total | 4 | 3 |  | 19 | 25 | 28
Recorded Investment, With an allowance recorded, Total | 534 | 2,015 |  | 534 | 2,015 | 1,580
Unpaid Principal Balance, With an allowance recorded, Total | 564 | 2,254 |  | 564 | 2,254 | 1,710
Related Allowance, With an allowance recorded, Total | 107 | 179 |  | 107 | 179 | 180
Average Recorded Investment, With an allowance recorded, Total | 604 | 2,232 |  | 875 | 1,714 | 1,687
Interest Income Recognized, With an allowance recorded, Total | 4 | 18 |  | 14 | 18 | 36
Recorded Investment, Total | 3,094 | 4,161 |  | 3,094 | 4,161 | 3,952
Unpaid Principal Balance, Total | 3,839 | 5,003 |  | 3,839 | 5,003 | 4,674
Average Recorded Investment, Total | 3,389 | 4,326 |  | 3,680 | 3,806 | 3,835
Interest Income Recognized, Total | 8 | 21 |  | 33 | 43 | 64
Real estate Residential |  |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |  |
Recorded Investment, With no related allowance, Total | 991 | 1,068 |  | 991 | 1,068 | 1,086
Unpaid Principal Balance, With no related allowance, Total | 1,184 | 1,219 |  | 1,184 | 1,219 | 1,263
Average Recorded Investment, With no related allowance, Total | 999 | 1,092 |  | 1,051 | 1,258 | 1,223
Interest Income Recognized, With no related allowance, Total | 5 | 5 |  | 15 | 15 | 21
Recorded Investment, With an allowance recorded, Total | 440 | 711 |  | 440 | 711 | 460
Unpaid Principal Balance, With an allowance recorded, Total | 446 | 795 |  | 446 | 795 | 482
Related Allowance, With an allowance recorded, Total | 41 | 92 |  | 41 | 92 | 75
Average Recorded Investment, With an allowance recorded, Total | 450 | 761 |  | 445 | 666 | 624
Interest Income Recognized, With an allowance recorded, Total | 3 | 3 |  | 10 | 10 | 13
Recorded Investment, Total | 1,431 | 1,779 |  | 1,431 | 1,779 | 1,546
Unpaid Principal Balance, Total | 1,630 | 2,014 |  | 1,630 | 2,014 | 1,745
Average Recorded Investment, Total | 1,449 | 1,853 |  | 1,496 | 1,924 | 1,847
Interest Income Recognized, Total | 8 | 8 |  | 25 | 25 | 34
Consumer |  |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |  |
Recorded Investment, With no related allowance, Total | 82 | 103 |  | 82 | 103 | 111
Unpaid Principal Balance, With no related allowance, Total | 96 | 119 |  | 96 | 119 | 121
Average Recorded Investment, With no related allowance, Total | 79 | 132 |  | 91 | 181 | 167
Recorded Investment, Total | 82 | 103 |  | 82 | 103 | 111
Unpaid Principal Balance, Total | 96 | 119 |  | 96 | 119 | 121
Average Recorded Investment, Total | $ 79 | $ 132 |  | $ 91 | $ 181 | $ 167

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