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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 8,653 | $ 7,278 | $ 8,653 | $ 7,278 | $ 5,653
Unpaid Principal Balance, With no related allowance, Total | 9,740 | 8,356 | 9,740 | 8,356 | 7,017
Average Recorded Investment, With no related allowance, Total | 8,489 | 6,769 | 7,974 | 6,673 | 6,468
Interest Income Recognized, With no related allowance, Total | 32 | 29 | 100 | 85 | 117
Recorded Investment, With an allowance recorded, Total | 2,434 | 3,934 | 2,434 | 3,934 | 3,988
Unpaid Principal Balance, With an allowance recorded, Total | 2,924 | 4,382 | 2,924 | 4,382 | 4,386
Related Allowance, With an allowance recorded, Total | 815 | 931 | 815 | 931 | 1,179
Average Recorded Investment, With an allowance recorded, Total | 3,213 | 4,110 | 3,711 | 4,363 | 4,288
Interest Income Recognized, With an allowance recorded, Total | 17 | 20 | 57 | 54 | 70
Recorded Investment, Total | 11,087 | 11,212 | 11,087 | 11,212 | 9,641
Unpaid Principal Balance, Total | 12,664 | 12,738 | 12,664 | 12,738 | 11,403
Related Allowance, With an allowance recorded, Total | 815 | 931 | 815 | 931 | 1,179
Average Recorded Investment, Total | 11,702 | 10,879 | 11,685 | 11,036 | 10,756
Interest Income Recognized, Total | 49 | 49 | 157 | 139 | 187
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 3,766 | 1,356 | 3,766 | 1,356 | 1,562
Unpaid Principal Balance, With no related allowance, Total | 4,272 | 1,538 | 4,272 | 1,538 | 1,900
Average Recorded Investment, With no related allowance, Total | 4,131 | 1,269 | 3,974 | 1,257 | 1,318
Interest Income Recognized, With no related allowance, Total | 18 | 17 | 52 | 50 | 67
Recorded Investment, With an allowance recorded, Total | 1,006 | 939 | 1,006 | 939 | 675
Unpaid Principal Balance, With an allowance recorded, Total | 1,008 | 1,086 | 1,008 | 1,086 | 675
Related Allowance, With an allowance recorded, Total | 394 | 93 | 394 | 93 | 50
Average Recorded Investment, With an allowance recorded, Total | 1,213 | 1,020 | 1,010 | 1,089 | 1,006
Interest Income Recognized, With an allowance recorded, Total | 9 | 7 | 21 | 23 | 30
Recorded Investment, Total | 4,772 | 2,295 | 4,772 | 2,295 | 2,237
Unpaid Principal Balance, Total | 5,280 | 2,624 | 5,280 | 2,624 | 2,575
Related Allowance, With an allowance recorded, Total | 394 | 93 | 394 | 93 | 50
Average Recorded Investment, Total | 5,344 | 2,289 | 4,984 | 2,346 | 2,324
Interest Income Recognized, Total | 27 | 24 | 73 | 73 | 97
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,981 | 3,414 | 2,981 | 3,414 | 1,969
Unpaid Principal Balance, With no related allowance, Total | 3,219 | 3,666 | 3,219 | 3,666 | 2,299
Average Recorded Investment, With no related allowance, Total | 2,969 | 3,143 | 2,501 | 3,036 | 2,822
Interest Income Recognized, With no related allowance, Total | 8 | 5 | 31 | 20 | 28
Recorded Investment, With an allowance recorded, Total | 622 | 1,669 | 622 | 1,669 | 1,152
Unpaid Principal Balance, With an allowance recorded, Total | 1,103 | 1,774 | 1,103 | 1,774 | 1,323
Related Allowance, With an allowance recorded, Total | 225 | 462 | 225 | 462 | 403
Average Recorded Investment, With an allowance recorded, Total | 766 | 1,712 | 1,030 | 1,807 | 1,676
Interest Income Recognized, With an allowance recorded, Total |  | 8 | 10 | 18 | 18
Recorded Investment, Total | 3,603 | 5,083 | 3,603 | 5,083 | 3,121
Unpaid Principal Balance, Total | 4,322 | 5,440 | 4,322 | 5,440 | 3,622
Related Allowance, With an allowance recorded, Total | 225 | 462 | 225 | 462 | 403
Average Recorded Investment, Total | 3,735 | 4,855 | 3,531 | 4,843 | 4,498
Interest Income Recognized, Total | 8 | 13 | 41 | 38 | 46
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,644 | 2,366 | 1,644 | 2,366 | 1,970
Unpaid Principal Balance, With no related allowance, Total | 1,974 | 3,003 | 1,974 | 3,003 | 2,658
Average Recorded Investment, With no related allowance, Total | 1,132 | 2,256 | 1,273 | 2,249 | 2,193
Interest Income Recognized, With no related allowance, Total | 6 | 7 | 17 | 15 | 22
Recorded Investment, With an allowance recorded, Total | 806 | 1,312 | 806 | 1,312 | 2,101
Unpaid Principal Balance, With an allowance recorded, Total | 813 | 1,508 | 813 | 1,508 | 2,328
Related Allowance, With an allowance recorded, Total | 196 | 362 | 196 | 362 | 666
Average Recorded Investment, With an allowance recorded, Total | 1,234 | 1,369 | 1,651 | 1,456 | 1,585
Interest Income Recognized, With an allowance recorded, Total | 8 | 5 | 26 | 13 | 22
Recorded Investment, Total | 2,450 | 3,678 | 2,450 | 3,678 | 4,071
Unpaid Principal Balance, Total | 2,787 | 4,511 | 2,787 | 4,511 | 4,986
Related Allowance, With an allowance recorded, Total | 196 | 362 | 196 | 362 | 666
Average Recorded Investment, Total | 2,366 | 3,625 | 2,924 | 3,705 | 3,778
Interest Income Recognized, Total | 14 | 12 | 43 | 28 | 44
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 262 | 142 | 262 | 142 | 152
Unpaid Principal Balance, With no related allowance, Total | 275 | 149 | 275 | 149 | 160
Average Recorded Investment, With no related allowance, Total | 257 | 101 | 226 | 131 | 135
Recorded Investment, With an allowance recorded, Total | 20 | 14 | 20 | 14 | 60
Unpaid Principal Balance, With an allowance recorded, Total |  | 14 |  | 14 | 60
Related Allowance, With an allowance recorded, Total |  | 14 |  | 14 | 60
Average Recorded Investment, With an allowance recorded, Total |  | 9 |  | 11 | 21
Recorded Investment, Total | 262 | 156 | 262 | 156 | 212
Unpaid Principal Balance, Total | 275 | 163 | 275 | 163 | 220
Related Allowance, With an allowance recorded, Total |  | 14 |  | 14 | 60
Average Recorded Investment, Total | $ 257 | $ 110 | $ 246 | $ 142 | $ 156

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