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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, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 7,299 | $ 9,268 | $ 7,535
Unpaid Principal Balance, With no related allowance, Total | 8,411 | 10,123 | 8,714
Average Recorded Investment, With no related allowance, Total | 7,418 | 7,461 | 7,887
Interest Income Recognized, With no related allowance, Total | 26 | 37 | 126
Recorded Investment, With an allowance recorded, Total | 3,925 | 4,412 | 2,585
Unpaid Principal Balance, With an allowance recorded, Total | 4,633 | 4,631 | 3,299
Related Allowance, With an allowance recorded, Total | 1,226 | 988 | 777
Average Recorded Investment, With an allowance recorded, Total | 3,256 | 4,201 | 3,490
Interest Income Recognized, With an allowance recorded, Total | 10 | 23 | 71
Recorded Investment, Total | 11,224 | 13,680 | 10,120
Unpaid Principal Balance, Total | 13,044 | 14,754 | 12,013
Related Allowance, With an allowance recorded, Total | 1,226 | 988 | 777
Average Recorded Investment, Total | 10,674 | 11,662 | 11,377
Interest Income Recognized, Total | 36 | 60 | 197
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 3,706 | 6,072 | 3,638
Unpaid Principal Balance, With no related allowance, Total | 4,249 | 6,407 | 4,175
Average Recorded Investment, With no related allowance, Total | 3,672 | 3,817 | 3,907
Interest Income Recognized, With no related allowance, Total | 16 | 17 | 63
Recorded Investment, With an allowance recorded, Total | 1,956 | 940 | 1,020
Unpaid Principal Balance, With an allowance recorded, Total | 1,974 | 990 | 1,038
Related Allowance, With an allowance recorded, Total | 764 | 138 | 363
Average Recorded Investment, With an allowance recorded, Total | 1,488 | 808 | 1,012
Interest Income Recognized, With an allowance recorded, Total | 6 | 7 | 32
Recorded Investment, Total | 5,662 | 7,012 | 4,658
Unpaid Principal Balance, Total | 6,223 | 7,397 | 5,213
Related Allowance, With an allowance recorded, Total | 764 | 138 | 363
Average Recorded Investment, Total | 5,160 | 4,625 | 4,919
Interest Income Recognized, Total | 22 | 24 | 95
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,263 | 2,098 | 1,918
Unpaid Principal Balance, With no related allowance, Total | 2,574 | 2,184 | 2,205
Average Recorded Investment, With no related allowance, Total | 2,091 | 2,034 | 2,385
Interest Income Recognized, With no related allowance, Total | 5 | 13 | 38
Recorded Investment, With an allowance recorded, Total | 1,263 | 1,437 | 1,130
Unpaid Principal Balance, With an allowance recorded, Total | 1,924 | 1,563 | 1,811
Related Allowance, With an allowance recorded, Total | 270 | 389 | 279
Average Recorded Investment, With an allowance recorded, Total | 1,197 | 1,295 | 1,050
Interest Income Recognized, With an allowance recorded, Total |  | 5 | 10
Recorded Investment, Total | 3,526 | 3,535 | 3,048
Unpaid Principal Balance, Total | 4,498 | 3,747 | 4,016
Related Allowance, With an allowance recorded, Total | 270 | 389 | 279
Average Recorded Investment, Total | 3,288 | 3,329 | 3,435
Interest Income Recognized, Total | 5 | 18 | 48
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,129 | 860 | 1,718
Unpaid Principal Balance, With no related allowance, Total | 1,369 | 1,287 | 2,060
Average Recorded Investment, With no related allowance, Total | 1,424 | 1,415 | 1,362
Interest Income Recognized, With no related allowance, Total | 5 | 7 | 25
Recorded Investment, With an allowance recorded, Total | 706 | 2,035 | 435
Unpaid Principal Balance, With an allowance recorded, Total | 735 | 2,078 | 450
Related Allowance, With an allowance recorded, Total | 192 | 461 | 135
Average Recorded Investment, With an allowance recorded, Total | 571 | 2,068 | 1,408
Interest Income Recognized, With an allowance recorded, Total | 4 | 11 | 29
Recorded Investment, Total | 1,835 | 2,895 | 2,153
Unpaid Principal Balance, Total | 2,104 | 3,365 | 2,510
Related Allowance, With an allowance recorded, Total | 192 | 461 | 135
Average Recorded Investment, Total | 1,995 | 3,483 | 2,770
Interest Income Recognized, Total | 9 | 18 | 54
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 201 | 238 | 261
Unpaid Principal Balance, With no related allowance, Total | 219 | 245 | 274
Average Recorded Investment, With no related allowance, Total | 231 | 195 | 233
Average Recorded Investment, With an allowance recorded, Total |  | 30 | 20
Recorded Investment, Total | 201 | 238 | 261
Unpaid Principal Balance, Total | 219 | 245 | 274
Average Recorded Investment, Total | $ 231 | $ 225 | $ 253

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