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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 6,238 | $ 8,322 | $ 6,238 | $ 8,322 | $ 7,535
Unpaid Principal Balance, With no related allowance, Total | 7,537 | 9,196 | 7,537 | 9,196 | 8,714
Average Recorded Investment, With no related allowance, Total | 6,770 | 8,797 | 7,024 | 7,748 | 7,887
Interest Income Recognized, With no related allowance, Total | 31 | 31 | 57 | 68 | 126
Recorded Investment, With an allowance recorded, Total | 5,745 | 3,991 | 5,745 | 3,991 | 2,585
Unpaid Principal Balance, With an allowance recorded, Total | 6,168 | 4,552 | 6,168 | 4,552 | 3,299
Related Allowance, With an allowance recorded, Total | 1,741 | 1,126 | 1,741 | 1,126 | 777
Average Recorded Investment, With an allowance recorded, Total | 4,836 | 4,202 | 4,085 | 4,130 | 3,490
Interest Income Recognized, With an allowance recorded, Total | 3 | 17 | 13 | 40 | 71
Recorded Investment, Total | 11,983 | 12,313 | 11,983 | 12,313 | 10,120
Unpaid Principal Balance, Total | 13,705 | 13,748 | 13,705 | 13,748 | 12,013
Related Allowance, With an allowance recorded, Total | 1,741 | 1,126 | 1,741 | 1,126 | 777
Average Recorded Investment, Total | 11,606 | 12,999 | 11,109 | 11,878 | 11,377
Interest Income Recognized, Total | 34 | 48 | 70 | 108 | 197
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,921 | 4,495 | 2,921 | 4,495 | 3,638
Unpaid Principal Balance, With no related allowance, Total | 3,480 | 4,931 | 3,480 | 4,931 | 4,175
Average Recorded Investment, With no related allowance, Total | 3,314 | 5,284 | 3,422 | 4,043 | 3,907
Interest Income Recognized, With no related allowance, Total | 9 | 17 | 25 | 34 | 63
Recorded Investment, With an allowance recorded, Total | 2,487 | 1,420 | 2,487 | 1,420 | 1,020
Unpaid Principal Balance, With an allowance recorded, Total | 2,516 | 1,432 | 2,516 | 1,432 | 1,038
Related Allowance, With an allowance recorded, Total | 1,339 | 615 | 1,339 | 615 | 363
Average Recorded Investment, With an allowance recorded, Total | 2,222 | 1,180 | 1,821 | 1,012 | 1,012
Interest Income Recognized, With an allowance recorded, Total |  | 5 | 6 | 12 | 32
Recorded Investment, Total | 5,408 | 5,915 | 5,408 | 5,915 | 4,658
Unpaid Principal Balance, Total | 5,996 | 6,363 | 5,996 | 6,363 | 5,213
Related Allowance, With an allowance recorded, Total | 1,339 | 615 | 1,339 | 615 | 363
Average Recorded Investment, Total | 5,536 | 6,464 | 5,243 | 5,055 | 4,919
Interest Income Recognized, Total | 9 | 22 | 31 | 46 | 95
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,042 | 2,957 | 2,042 | 2,957 | 1,918
Unpaid Principal Balance, With no related allowance, Total | 2,606 | 3,116 | 2,606 | 3,116 | 2,205
Average Recorded Investment, With no related allowance, Total | 2,153 | 2,528 | 2,074 | 2,341 | 2,385
Interest Income Recognized, With no related allowance, Total | 17 | 10 | 22 | 23 | 38
Recorded Investment, With an allowance recorded, Total | 2,448 | 910 | 2,448 | 910 | 1,130
Unpaid Principal Balance, With an allowance recorded, Total | 2,774 | 1,380 | 2,774 | 1,380 | 1,811
Related Allowance, With an allowance recorded, Total | 239 | 216 | 239 | 216 | 279
Average Recorded Investment, With an allowance recorded, Total | 1,856 | 1,174 | 1,614 | 1,166 | 1,050
Interest Income Recognized, With an allowance recorded, Total |  | 5 |  | 10 | 10
Recorded Investment, Total | 4,490 | 3,867 | 4,490 | 3,867 | 3,048
Unpaid Principal Balance, Total | 5,380 | 4,496 | 5,380 | 4,496 | 4,016
Related Allowance, With an allowance recorded, Total | 239 | 216 | 239 | 216 | 279
Average Recorded Investment, Total | 4,009 | 3,702 | 3,688 | 3,507 | 3,435
Interest Income Recognized, Total | 17 | 15 | 22 | 33 | 48
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,115 | 619 | 1,115 | 619 | 1,718
Unpaid Principal Balance, With no related allowance, Total | 1,273 | 888 | 1,273 | 888 | 2,060
Average Recorded Investment, With no related allowance, Total | 1,122 | 740 | 1,321 | 1,150 | 1,362
Interest Income Recognized, With no related allowance, Total | 5 | 4 | 10 | 11 | 25
Recorded Investment, With an allowance recorded, Total | 810 | 1,661 | 810 | 1,661 | 435
Unpaid Principal Balance, With an allowance recorded, Total | 878 | 1,740 | 878 | 1,740 | 450
Related Allowance, With an allowance recorded, Total | 163 | 295 | 163 | 295 | 135
Average Recorded Investment, With an allowance recorded, Total | 758 | 1,848 | 650 | 1,932 | 1,408
Interest Income Recognized, With an allowance recorded, Total | 3 | 7 | 7 | 18 | 29
Recorded Investment, Total | 1,925 | 2,280 | 1,925 | 2,280 | 2,153
Unpaid Principal Balance, Total | 2,151 | 2,628 | 2,151 | 2,628 | 2,510
Related Allowance, With an allowance recorded, Total | 163 | 295 | 163 | 295 | 135
Average Recorded Investment, Total | 1,880 | 2,588 | 1,971 | 3,082 | 2,770
Interest Income Recognized, Total | 8 | 11 | 17 | 29 | 54
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 160 | 251 | 160 | 251 | 261
Unpaid Principal Balance, With no related allowance, Total | 178 | 261 | 178 | 261 | 274
Average Recorded Investment, With no related allowance, Total | 181 | 245 | 207 | 214 | 233
Average Recorded Investment, With an allowance recorded, Total |  |  |  | 20 | 20
Recorded Investment, Total | 160 | 251 | 160 | 251 | 261
Unpaid Principal Balance, Total | 178 | 261 | 178 | 261 | 274
Average Recorded Investment, Total | $ 181 | $ 245 | $ 207 | $ 234 | $ 253

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