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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, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 9,268 | $ 6,621 | $ 5,653
Unpaid Principal Balance, With no related allowance, Total | 10,123 | 7,608 | 7,017
Average Recorded Investment, With no related allowance, Total | 7,461 | 6,578 | 6,468
Interest Income Recognized, With no related allowance, Total | 37 | 27 | 117
Recorded Investment, With an allowance recorded, Total | 4,412 | 5,044 | 3,988
Unpaid Principal Balance, With an allowance recorded, Total | 4,631 | 5,673 | 4,386
Related Allowance, With an allowance recorded, Total | 988 | 1,755 | 1,179
Average Recorded Investment, With an allowance recorded, Total | 4,201 | 4,618 | 4,288
Interest Income Recognized, With an allowance recorded, Total | 23 | 18 | 70
Recorded Investment, Total | 13,680 | 11,665 | 9,641
Unpaid Principal Balance, Total | 14,754 | 13,281 | 11,403
Related Allowance, With an allowance recorded, Total | 988 | 1,755 | 1,179
Average Recorded Investment, Total | 11,662 | 11,196 | 10,756
Interest Income Recognized, Total | 60 | 45 | 187
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 6,072 | 1,211 | 1,562
Unpaid Principal Balance, With no related allowance, Total | 6,407 | 1,375 | 1,900
Average Recorded Investment, With no related allowance, Total | 3,817 | 1,246 | 1,318
Interest Income Recognized, With no related allowance, Total | 17 | 17 | 67
Recorded Investment, With an allowance recorded, Total | 940 | 1,133 | 675
Unpaid Principal Balance, With an allowance recorded, Total | 990 | 1,158 | 675
Related Allowance, With an allowance recorded, Total | 138 | 144 | 50
Average Recorded Investment, With an allowance recorded, Total | 808 | 1,159 | 1,006
Interest Income Recognized, With an allowance recorded, Total | 7 | 8 | 30
Recorded Investment, Total | 7,012 | 2,344 | 2,237
Unpaid Principal Balance, Total | 7,397 | 2,533 | 2,575
Related Allowance, With an allowance recorded, Total | 138 | 144 | 50
Average Recorded Investment, Total | 4,625 | 2,405 | 2,324
Interest Income Recognized, Total | 24 | 25 | 97
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,098 | 2,970 | 1,969
Unpaid Principal Balance, With no related allowance, Total | 2,184 | 3,312 | 2,299
Average Recorded Investment, With no related allowance, Total | 2,034 | 2,929 | 2,822
Interest Income Recognized, With no related allowance, Total | 13 | 6 | 28
Recorded Investment, With an allowance recorded, Total | 1,437 | 2,402 | 1,152
Unpaid Principal Balance, With an allowance recorded, Total | 1,563 | 2,520 | 1,323
Related Allowance, With an allowance recorded, Total | 389 | 1,411 | 403
Average Recorded Investment, With an allowance recorded, Total | 1,295 | 1,902 | 1,676
Interest Income Recognized, With an allowance recorded, Total | 5 | 6 | 18
Recorded Investment, Total | 3,535 | 5,372 | 3,121
Unpaid Principal Balance, Total | 3,747 | 5,832 | 3,622
Related Allowance, With an allowance recorded, Total | 389 | 1,411 | 403
Average Recorded Investment, Total | 3,329 | 4,831 | 4,498
Interest Income Recognized, Total | 18 | 12 | 46
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 860 | 2,289 | 1,970
Unpaid Principal Balance, With no related allowance, Total | 1,287 | 2,762 | 2,658
Average Recorded Investment, With no related allowance, Total | 1,415 | 2,243 | 2,193
Interest Income Recognized, With no related allowance, Total | 7 | 4 | 22
Recorded Investment, With an allowance recorded, Total | 2,035 | 1,491 | 2,101
Unpaid Principal Balance, With an allowance recorded, Total | 2,078 | 1,977 | 2,328
Related Allowance, With an allowance recorded, Total | 461 | 182 | 666
Average Recorded Investment, With an allowance recorded, Total | 2,068 | 1,544 | 1,585
Interest Income Recognized, With an allowance recorded, Total | 11 | 4 | 22
Recorded Investment, Total | 2,895 | 3,780 | 4,071
Unpaid Principal Balance, Total | 3,365 | 4,739 | 4,986
Related Allowance, With an allowance recorded, Total | 461 | 182 | 666
Average Recorded Investment, Total | 3,483 | 3,787 | 3,778
Interest Income Recognized, Total | 18 | 8 | 44
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 238 | 151 | 152
Unpaid Principal Balance, With no related allowance, Total | 245 | 159 | 160
Average Recorded Investment, With no related allowance, Total | 195 | 160 | 135
Recorded Investment, With an allowance recorded, Total |  | 18 | 60
Unpaid Principal Balance, With an allowance recorded, Total |  | 18 | 60
Related Allowance, With an allowance recorded, Total |  | 18 | 60
Average Recorded Investment, With an allowance recorded, Total | 30 | 13 | 21
Recorded Investment, Total | 238 | 169 | 212
Unpaid Principal Balance, Total | 245 | 177 | 220
Related Allowance, With an allowance recorded, Total |  | 18 | 60
Average Recorded Investment, Total | $ 225 | $ 173 | $ 156

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