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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
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 3,546 | $ 5,820 | $ 7,535
Unpaid Principal Balance, With no related allowance, Total | 4,822 | 7,769 | 8,714
Average Recorded Investment, With no related allowance, Total | 4,799 | 6,453 | 7,887
Interest Income Recognized, With no related allowance, Total | 54 | 79 | 126
Recorded Investment, With an allowance recorded, Total | 955 | 4,086 | 2,585
Unpaid Principal Balance, With an allowance recorded, Total | 985 | 4,286 | 3,299
Related Allowance, With an allowance recorded, Total | 175 | 1,202 | 777
Average Recorded Investment, With an allowance recorded, Total | 2,329 | 4,349 | 3,490
Interest Income Recognized, With an allowance recorded, Total | 50 | 66 | 71
Recorded Investment, Total | 4,501 | 9,906 | 10,120
Unpaid Principal Balance, Total | 5,807 | 12,055 | 12,013
Average Recorded Investment, Total | 7,128 | 10,802 | 11,377
Interest Income Recognized, Total | 104 | 145 | 197
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 158 | 2,251 | 3,638
Unpaid Principal Balance, With no related allowance, Total | 481 | 3,421 | 4,175
Average Recorded Investment, With no related allowance, Total | 964 | 2,915 | 3,907
Interest Income Recognized, With no related allowance, Total | 13 | 30 | 63
Recorded Investment, With an allowance recorded, Total | 41 | 2,046 | 1,020
Unpaid Principal Balance, With an allowance recorded, Total | 41 | 2,094 | 1,038
Related Allowance, With an allowance recorded, Total | 40 | 947 | 363
Average Recorded Investment, With an allowance recorded, Total | 1,091 | 2,038 | 1,012
Interest Income Recognized, With an allowance recorded, Total | 15 | 17 | 32
Recorded Investment, Total | 199 | 4,297 | 4,658
Unpaid Principal Balance, Total | 522 | 5,515 | 5,213
Average Recorded Investment, Total | 2,055 | 4,953 | 4,919
Interest Income Recognized, Total | 28 | 47 | 95
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,376 | 2,372 | 1,918
Unpaid Principal Balance, With no related allowance, Total | 3,120 | 2,964 | 2,205
Average Recorded Investment, With no related allowance, Total | 2,719 | 2,148 | 2,385
Interest Income Recognized, With no related allowance, Total | 22 | 28 | 38
Recorded Investment, With an allowance recorded, Total | 513 | 1,580 | 1,130
Unpaid Principal Balance, With an allowance recorded, Total | 543 | 1,710 | 1,811
Related Allowance, With an allowance recorded, Total | 109 | 180 | 279
Average Recorded Investment, With an allowance recorded, Total | 802 | 1,687 | 1,050
Interest Income Recognized, With an allowance recorded, Total | 22 | 36 | 10
Recorded Investment, Total | 2,889 | 3,952 | 3,048
Unpaid Principal Balance, Total | 3,663 | 4,674 | 4,016
Average Recorded Investment, Total | 3,521 | 3,835 | 3,435
Interest Income Recognized, Total | 44 | 64 | 48
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 873 | 1,086 | 1,718
Unpaid Principal Balance, With no related allowance, Total | 1,073 | 1,263 | 2,060
Average Recorded Investment, With no related allowance, Total | 1,016 | 1,223 | 1,362
Interest Income Recognized, With no related allowance, Total | 19 | 21 | 25
Recorded Investment, With an allowance recorded, Total | 401 | 460 | 435
Unpaid Principal Balance, With an allowance recorded, Total | 401 | 482 | 450
Related Allowance, With an allowance recorded, Total | 26 | 75 | 135
Average Recorded Investment, With an allowance recorded, Total | 436 | 624 | 1,408
Interest Income Recognized, With an allowance recorded, Total | 13 | 13 | 29
Recorded Investment, Total | 1,274 | 1,546 | 2,153
Unpaid Principal Balance, Total | 1,474 | 1,745 | 2,510
Average Recorded Investment, Total | 1,452 | 1,847 | 2,770
Interest Income Recognized, Total | 32 | 34 | 54
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 139 | 111 | 261
Unpaid Principal Balance, With no related allowance, Total | 148 | 121 | 274
Average Recorded Investment, With no related allowance, Total | 100 | 167 | 233
Average Recorded Investment, With an allowance recorded, Total |  |  | 20
Recorded Investment, Total | 139 | 111 | 261
Unpaid Principal Balance, Total | 148 | 121 | 274
Average Recorded Investment, Total | $ 100 | $ 167 | $ 253

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