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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 8,322 | $ 6,259 | $ 8,322 | $ 6,259 | $ 5,653
Unpaid Principal Balance, With no related allowance, Total | 9,196 | 7,532 | 9,196 | 7,532 | 7,017
Average Recorded Investment, With no related allowance, Total | 8,797 | 6,442 | 7,748 | 6,471 | 6,468
Interest Income Recognized, With no related allowance, Total | 31 | 29 | 68 | 56 | 117
Recorded Investment, With an allowance recorded, Total | 3,991 | 4,283 | 3,991 | 4,283 | 3,988
Unpaid Principal Balance, With an allowance recorded, Total | 4,552 | 4,553 | 4,552 | 4,553 | 4,386
Related Allowance, With an allowance recorded, Total | 1,126 | 1,029 | 1,126 | 1,029 | 1,179
Average Recorded Investment, With an allowance recorded, Total | 4,202 | 4,665 | 4,130 | 4,506 | 4,288
Interest Income Recognized, With an allowance recorded, Total | 17 | 16 | 40 | 34 | 70
Recorded Investment, Total | 12,313 | 10,542 | 12,313 | 10,542 | 9,641
Unpaid Principal Balance, Total | 13,748 | 12,085 | 13,748 | 12,085 | 11,403
Related Allowance, With an allowance recorded, Total | 1,126 | 1,029 | 1,126 | 1,029 | 1,179
Average Recorded Investment, Total | 12,999 | 11,107 | 11,878 | 10,977 | 10,756
Interest Income Recognized, Total | 48 | 45 | 108 | 90 | 187
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 4,495 | 1,182 | 4,495 | 1,182 | 1,562
Unpaid Principal Balance, With no related allowance, Total | 4,931 | 1,355 | 4,931 | 1,355 | 1,900
Average Recorded Investment, With no related allowance, Total | 5,284 | 1,197 | 4,043 | 1,224 | 1,318
Interest Income Recognized, With no related allowance, Total | 17 | 16 | 34 | 33 | 67
Recorded Investment, With an allowance recorded, Total | 1,420 | 1,100 | 1,420 | 1,100 | 675
Unpaid Principal Balance, With an allowance recorded, Total | 1,432 | 1,124 | 1,432 | 1,124 | 675
Related Allowance, With an allowance recorded, Total | 615 | 146 | 615 | 146 | 50
Average Recorded Investment, With an allowance recorded, Total | 1,180 | 1,117 | 1,012 | 1,139 | 1,006
Interest Income Recognized, With an allowance recorded, Total | 5 | 8 | 12 | 16 | 30
Recorded Investment, Total | 5,915 | 2,282 | 5,915 | 2,282 | 2,237
Unpaid Principal Balance, Total | 6,363 | 2,479 | 6,363 | 2,479 | 2,575
Related Allowance, With an allowance recorded, Total | 615 | 146 | 615 | 146 | 50
Average Recorded Investment, Total | 6,464 | 2,314 | 5,055 | 2,363 | 2,324
Interest Income Recognized, Total | 22 | 24 | 46 | 49 | 97
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,957 | 2,871 | 2,957 | 2,871 | 1,969
Unpaid Principal Balance, With no related allowance, Total | 3,116 | 3,262 | 3,116 | 3,262 | 2,299
Average Recorded Investment, With no related allowance, Total | 2,528 | 2,921 | 2,341 | 2,910 | 2,822
Interest Income Recognized, With no related allowance, Total | 10 | 9 | 23 | 15 | 28
Recorded Investment, With an allowance recorded, Total | 910 | 1,755 | 910 | 1,755 | 1,152
Unpaid Principal Balance, With an allowance recorded, Total | 1,380 | 1,876 | 1,380 | 1,876 | 1,323
Related Allowance, With an allowance recorded, Total | 216 | 502 | 216 | 502 | 403
Average Recorded Investment, With an allowance recorded, Total | 1,174 | 2,079 | 1,166 | 1,853 | 1,676
Interest Income Recognized, With an allowance recorded, Total | 5 | 4 | 10 | 10 | 18
Recorded Investment, Total | 3,867 | 4,626 | 3,867 | 4,626 | 3,121
Unpaid Principal Balance, Total | 4,496 | 5,138 | 4,496 | 5,138 | 3,622
Related Allowance, With an allowance recorded, Total | 216 | 502 | 216 | 502 | 403
Average Recorded Investment, Total | 3,702 | 5,000 | 3,507 | 4,763 | 4,498
Interest Income Recognized, Total | 15 | 13 | 33 | 25 | 46
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 619 | 2,146 | 619 | 2,146 | 1,970
Unpaid Principal Balance, With no related allowance, Total | 888 | 2,848 | 888 | 2,848 | 2,658
Average Recorded Investment, With no related allowance, Total | 740 | 2,218 | 1,150 | 2,210 | 2,193
Interest Income Recognized, With no related allowance, Total | 4 | 4 | 11 | 8 | 22
Recorded Investment, With an allowance recorded, Total | 1,661 | 1,425 | 1,661 | 1,425 | 2,101
Unpaid Principal Balance, With an allowance recorded, Total | 1,740 | 1,550 | 1,740 | 1,550 | 2,328
Related Allowance, With an allowance recorded, Total | 295 | 378 | 295 | 378 | 666
Average Recorded Investment, With an allowance recorded, Total | 1,848 | 1,458 | 1,932 | 1,504 | 1,585
Interest Income Recognized, With an allowance recorded, Total | 7 | 4 | 18 | 8 | 22
Recorded Investment, Total | 2,280 | 3,571 | 2,280 | 3,571 | 4,071
Unpaid Principal Balance, Total | 2,628 | 4,398 | 2,628 | 4,398 | 4,986
Related Allowance, With an allowance recorded, Total | 295 | 378 | 295 | 378 | 666
Average Recorded Investment, Total | 2,588 | 3,676 | 3,082 | 3,714 | 3,778
Interest Income Recognized, Total | 11 | 8 | 29 | 16 | 44
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 251 | 60 | 251 | 60 | 152
Unpaid Principal Balance, With no related allowance, Total | 261 | 67 | 261 | 67 | 160
Average Recorded Investment, With no related allowance, Total | 245 | 106 | 214 | 127 | 135
Recorded Investment, With an allowance recorded, Total | 20 | 3 | 20 | 3 | 60
Unpaid Principal Balance, With an allowance recorded, Total |  | 3 |  | 3 | 60
Related Allowance, With an allowance recorded, Total |  | 3 |  | 3 | 60
Average Recorded Investment, With an allowance recorded, Total |  | 11 |  | 10 | 21
Recorded Investment, Total | 251 | 63 | 251 | 63 | 212
Unpaid Principal Balance, Total | 261 | 70 | 261 | 70 | 220
Related Allowance, With an allowance recorded, Total |  | 3 |  | 3 | 60
Average Recorded Investment, Total | $ 245 | $ 117 | $ 234 | $ 137 | $ 156

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