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Loans, net and allowance for loan losses - Summarized Information in Concerning to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 5,820 | $ 7,535 | $ 5,653
Unpaid Principal Balance, With no related allowance, Total | 7,769 | 8,714 | 7,017
Average Recorded Investment, With no related allowance, Total | 6,453 | 7,887 | 6,468
Interest Income Recognized, With no related allowance, Total | 79 | 126 | 117
Recorded Investment, With an allowance recorded, Total | 4,086 | 2,585 | 3,988
Unpaid Principal Balance, With an allowance recorded, Total | 4,286 | 3,299 | 4,386
Related Allowance, With an allowance recorded, Total | 1,202 | 777 | 1,179
Average Recorded Investment, With an allowance recorded, Total | 4,349 | 3,490 | 4,288
Interest Income Recognized, With an allowance recorded, Total | 66 | 71 | 70
Recorded Investment, Total | 9,906 | 10,120 | 9,641
Unpaid Principal Balance, Total | 12,055 | 12,013 | 11,403
Related Allowance, With an allowance recorded, Total | 1,202 | 777 | 1,179
Average Recorded Investment, Total | 10,802 | 11,377 | 10,756
Interest Income Recognized, Total | 145 | 197 | 187
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,251 | 3,638 | 1,562
Unpaid Principal Balance, With no related allowance, Total | 3,421 | 4,175 | 1,900
Average Recorded Investment, With no related allowance, Total | 2,915 | 3,907 | 1,318
Interest Income Recognized, With no related allowance, Total | 30 | 63 | 67
Recorded Investment, With an allowance recorded, Total | 2,046 | 1,020 | 675
Unpaid Principal Balance, With an allowance recorded, Total | 2,094 | 1,038 | 675
Related Allowance, With an allowance recorded, Total | 947 | 363 | 50
Average Recorded Investment, With an allowance recorded, Total | 2,038 | 1,012 | 1,006
Interest Income Recognized, With an allowance recorded, Total | 17 | 32 | 30
Recorded Investment, Total | 4,297 | 4,658 | 2,237
Unpaid Principal Balance, Total | 5,515 | 5,213 | 2,575
Related Allowance, With an allowance recorded, Total | 947 | 363 | 50
Average Recorded Investment, Total | 4,953 | 4,919 | 2,324
Interest Income Recognized, Total | 47 | 95 | 97
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,372 | 1,918 | 1,969
Unpaid Principal Balance, With no related allowance, Total | 2,964 | 2,205 | 2,299
Average Recorded Investment, With no related allowance, Total | 2,148 | 2,385 | 2,822
Interest Income Recognized, With no related allowance, Total | 28 | 38 | 28
Recorded Investment, With an allowance recorded, Total | 1,580 | 1,130 | 1,152
Unpaid Principal Balance, With an allowance recorded, Total | 1,710 | 1,811 | 1,323
Related Allowance, With an allowance recorded, Total | 180 | 279 | 403
Average Recorded Investment, With an allowance recorded, Total | 1,687 | 1,050 | 1,676
Interest Income Recognized, With an allowance recorded, Total | 36 | 10 | 18
Recorded Investment, Total | 3,952 | 3,048 | 3,121
Unpaid Principal Balance, Total | 4,674 | 4,016 | 3,622
Related Allowance, With an allowance recorded, Total | 180 | 279 | 403
Average Recorded Investment, Total | 3,835 | 3,435 | 4,498
Interest Income Recognized, Total | 64 | 48 | 46
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,086 | 1,718 | 1,970
Unpaid Principal Balance, With no related allowance, Total | 1,263 | 2,060 | 2,658
Average Recorded Investment, With no related allowance, Total | 1,223 | 1,362 | 2,193
Interest Income Recognized, With no related allowance, Total | 21 | 25 | 22
Recorded Investment, With an allowance recorded, Total | 460 | 435 | 2,101
Unpaid Principal Balance, With an allowance recorded, Total | 482 | 450 | 2,328
Related Allowance, With an allowance recorded, Total | 75 | 135 | 666
Average Recorded Investment, With an allowance recorded, Total | 624 | 1,408 | 1,585
Interest Income Recognized, With an allowance recorded, Total | 13 | 29 | 22
Recorded Investment, Total | 1,546 | 2,153 | 4,071
Unpaid Principal Balance, Total | 1,745 | 2,510 | 4,986
Related Allowance, With an allowance recorded, Total | 75 | 135 | 666
Average Recorded Investment, Total | 1,847 | 2,770 | 3,778
Interest Income Recognized, Total | 34 | 54 | 44
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 111 | 261 | 152
Unpaid Principal Balance, With no related allowance, Total | 121 | 274 | 160
Average Recorded Investment, With no related allowance, Total | 167 | 233 | 135
Recorded Investment, With an allowance recorded, Total |  |  | 60
Unpaid Principal Balance, With an allowance recorded, Total |  |  | 60
Related Allowance, With an allowance recorded, Total |  |  | 60
Average Recorded Investment, With an allowance recorded, Total |  | 20 | 21
Recorded Investment, Total | 111 | 261 | 212
Unpaid Principal Balance, Total | 121 | 274 | 220
Related Allowance, With an allowance recorded, Total |  |  | 60
Average Recorded Investment, Total | $ 167 | $ 253 | $ 156

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