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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 5,168 | $ 7,299 | $ 5,820
Unpaid Principal Balance, With no related allowance, Total | 6,505 | 8,411 | 7,769
Average Recorded Investment, With no related allowance, Total | 5,495 | 7,418 | 6,453
Interest Income Recognized, With no related allowance, Total | 16 | 26 | 79
Recorded Investment, With an allowance recorded, Total | 3,110 | 3,925 | 4,086
Unpaid Principal Balance, With an allowance recorded, Total | 3,294 | 4,633 | 4,286
Related Allowance, With an allowance recorded, Total | 869 | 1,226 | 1,202
Average Recorded Investment, With an allowance recorded, Total | 3,598 | 3,256 | 4,349
Interest Income Recognized, With an allowance recorded, Total | 13 | 10 | 66
Recorded Investment, Total | 8,278 | 11,224 | 9,906
Unpaid Principal Balance, Total | 9,799 | 13,044 | 12,055
Related Allowance, With an allowance recorded, Total | 869 | 1,226 | 1,202
Average Recorded Investment, Total | 9,093 | 10,674 | 10,802
Interest Income Recognized, Total | 29 | 36 | 145
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 673 | 3,706 | 2,251
Unpaid Principal Balance, With no related allowance, Total | 1,108 | 4,249 | 3,421
Average Recorded Investment, With no related allowance, Total | 1,462 | 3,672 | 2,915
Interest Income Recognized, With no related allowance, Total | 4 | 16 | 30
Recorded Investment, With an allowance recorded, Total | 1,978 | 1,956 | 2,046
Unpaid Principal Balance, With an allowance recorded, Total | 2,041 | 1,974 | 2,094
Related Allowance, With an allowance recorded, Total | 697 | 764 | 947
Average Recorded Investment, With an allowance recorded, Total | 2,012 | 1,488 | 2,038
Interest Income Recognized, With an allowance recorded, Total | 5 | 6 | 17
Recorded Investment, Total | 2,651 | 5,662 | 4,297
Unpaid Principal Balance, Total | 3,149 | 6,223 | 5,515
Related Allowance, With an allowance recorded, Total | 697 | 764 | 947
Average Recorded Investment, Total | 3,474 | 5,160 | 4,953
Interest Income Recognized, Total | 9 | 22 | 47
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 3,280 | 2,263 | 2,372
Unpaid Principal Balance, With no related allowance, Total | 4,051 | 2,574 | 2,964
Average Recorded Investment, With no related allowance, Total | 2,826 | 2,091 | 2,148
Interest Income Recognized, With no related allowance, Total | 6 | 5 | 28
Recorded Investment, With an allowance recorded, Total | 710 | 1,263 | 1,580
Unpaid Principal Balance, With an allowance recorded, Total | 796 | 1,924 | 1,710
Related Allowance, With an allowance recorded, Total | 108 | 270 | 180
Average Recorded Investment, With an allowance recorded, Total | 1,145 | 1,197 | 1,687
Interest Income Recognized, With an allowance recorded, Total | 4 |  | 36
Recorded Investment, Total | 3,990 | 3,526 | 3,952
Unpaid Principal Balance, Total | 4,847 | 4,498 | 4,674
Related Allowance, With an allowance recorded, Total | 108 | 270 | 180
Average Recorded Investment, Total | 3,971 | 3,288 | 3,835
Interest Income Recognized, Total | 10 | 5 | 64
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,121 | 1,129 | 1,086
Unpaid Principal Balance, With no related allowance, Total | 1,241 | 1,369 | 1,263
Average Recorded Investment, With no related allowance, Total | 1,104 | 1,424 | 1,223
Interest Income Recognized, With no related allowance, Total | 6 | 5 | 21
Recorded Investment, With an allowance recorded, Total | 422 | 706 | 460
Unpaid Principal Balance, With an allowance recorded, Total | 457 | 735 | 482
Related Allowance, With an allowance recorded, Total | 64 | 192 | 75
Average Recorded Investment, With an allowance recorded, Total | 441 | 571 | 624
Interest Income Recognized, With an allowance recorded, Total | 4 | 4 | 13
Recorded Investment, Total | 1,543 | 1,835 | 1,546
Unpaid Principal Balance, Total | 1,698 | 2,104 | 1,745
Related Allowance, With an allowance recorded, Total | 64 | 192 | 75
Average Recorded Investment, Total | 1,545 | 1,995 | 1,847
Interest Income Recognized, Total | 10 | 9 | 34
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 94 | 201 | 111
Unpaid Principal Balance, With no related allowance, Total | 105 | 219 | 121
Average Recorded Investment, With no related allowance, Total | 103 | 231 | 167
Recorded Investment, Total | 94 | 201 | 111
Unpaid Principal Balance, Total | 105 | 219 | 121
Average Recorded Investment, Total | $ 103 | $ 231 | $ 167

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