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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 7,535 | $ 5,653 | $ 6,532
Unpaid Principal Balance, With no related allowance, Total | 8,714 | 7,017 | 7,482
Average Recorded Investment, With no related allowance, Total | 7,887 | 6,468 | 7,053
Interest Income Recognized, With no related allowance, Total | 126 | 117 | 88
Recorded Investment, With an allowance recorded, Total | 2,585 | 3,988 | 4,190
Unpaid Principal Balance, With an allowance recorded, Total | 3,299 | 4,386 | 4,481
Related Allowance, With an allowance recorded, Total | 777 | 1,179 | 766
Average Recorded Investment, With an allowance recorded, Total | 3,490 | 4,288 | 4,548
Interest Income Recognized, With an allowance recorded, Total | 71 | 70 | 91
Recorded Investment, Total | 10,120 | 9,641 | 10,722
Unpaid Principal Balance, Total | 12,013 | 11,403 | 11,963
Related Allowance, With an allowance recorded, Total | 777 | 1,179 | 766
Average Recorded Investment, Total | 11,377 | 10,756 | 11,601
Interest Income Recognized, Total | 197 | 187 | 179
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 3,638 | 1,562 | 1,279
Unpaid Principal Balance, With no related allowance, Total | 4,175 | 1,900 | 1,439
Average Recorded Investment, With no related allowance, Total | 3,907 | 1,318 | 1,668
Interest Income Recognized, With no related allowance, Total | 63 | 67 | 43
Recorded Investment, With an allowance recorded, Total | 1,020 | 675 | 1,184
Unpaid Principal Balance, With an allowance recorded, Total | 1,038 | 675 | 1,218
Related Allowance, With an allowance recorded, Total | 363 | 50 | 159
Average Recorded Investment, With an allowance recorded, Total | 1,012 | 1,006 | 991
Interest Income Recognized, With an allowance recorded, Total | 32 | 30 | 50
Recorded Investment, Total | 4,658 | 2,237 | 2,463
Unpaid Principal Balance, Total | 5,213 | 2,575 | 2,657
Related Allowance, With an allowance recorded, Total | 363 | 50 | 159
Average Recorded Investment, Total | 4,919 | 2,324 | 2,659
Interest Income Recognized, Total | 95 | 97 | 93
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,918 | 1,969 | 2,888
Unpaid Principal Balance, With no related allowance, Total | 2,205 | 2,299 | 3,190
Average Recorded Investment, With no related allowance, Total | 2,385 | 2,822 | 2,985
Interest Income Recognized, With no related allowance, Total | 38 | 28 | 24
Recorded Investment, With an allowance recorded, Total | 1,130 | 1,152 | 1,401
Unpaid Principal Balance, With an allowance recorded, Total | 1,811 | 1,323 | 1,496
Related Allowance, With an allowance recorded, Total | 279 | 403 | 263
Average Recorded Investment, With an allowance recorded, Total | 1,050 | 1,676 | 2,202
Interest Income Recognized, With an allowance recorded, Total | 10 | 18 | 18
Recorded Investment, Total | 3,048 | 3,121 | 4,289
Unpaid Principal Balance, Total | 4,016 | 3,622 | 4,686
Related Allowance, With an allowance recorded, Total | 279 | 403 | 263
Average Recorded Investment, Total | 3,435 | 4,498 | 5,187
Interest Income Recognized, Total | 48 | 46 | 42
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,718 | 1,970 | 2,196
Unpaid Principal Balance, With no related allowance, Total | 2,060 | 2,658 | 2,672
Average Recorded Investment, With no related allowance, Total | 1,362 | 2,193 | 2,227
Interest Income Recognized, With no related allowance, Total | 25 | 22 | 21
Recorded Investment, With an allowance recorded, Total | 435 | 2,101 | 1,597
Unpaid Principal Balance, With an allowance recorded, Total | 450 | 2,328 | 1,759
Related Allowance, With an allowance recorded, Total | 135 | 666 | 336
Average Recorded Investment, With an allowance recorded, Total | 1,408 | 1,585 | 1,335
Interest Income Recognized, With an allowance recorded, Total | 29 | 22 | 23
Recorded Investment, Total | 2,153 | 4,071 | 3,793
Unpaid Principal Balance, Total | 2,510 | 4,986 | 4,431
Related Allowance, With an allowance recorded, Total | 135 | 666 | 336
Average Recorded Investment, Total | 2,770 | 3,778 | 3,562
Interest Income Recognized, Total | 54 | 44 | 44
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 261 | 152 | 169
Unpaid Principal Balance, With no related allowance, Total | 274 | 160 | 181
Average Recorded Investment, With no related allowance, Total | 233 | 135 | 173
Recorded Investment, With an allowance recorded, Total |  | 60 | 8
Unpaid Principal Balance, With an allowance recorded, Total |  | 60 | 8
Related Allowance, With an allowance recorded, Total |  | 60 | 8
Average Recorded Investment, With an allowance recorded, Total | 20 | 21 | 20
Recorded Investment, Total | 261 | 212 | 177
Unpaid Principal Balance, Total | 274 | 220 | 189
Related Allowance, With an allowance recorded, Total |  | 60 | 8
Average Recorded Investment, Total | $ 253 | $ 156 | $ 193

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