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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 7,278 | $ 7,684 | $ 7,278 | $ 7,684 | $ 6,532
Unpaid Principal Balance, With no related allowance, Total | 8,356 | 8,557 | 8,356 | 8,557 | 7,482
Average Recorded Investment, With no related allowance, Total | 6,769 | 7,297 | 6,673 | 7,184 | 7,053
Interest Income Recognized, With no related allowance, Total | 29 | 38 | 85 | 92 | 88
Recorded Investment, With an allowance recorded, Total | 3,934 | 4,088 | 3,934 | 4,088 | 4,190
Unpaid Principal Balance, With an allowance recorded, Total | 4,382 | 4,669 | 4,382 | 4,669 | 4,481
Related Allowance, With an allowance recorded, Total | 931 | 1,706 | 931 | 1,706 | 766
Average Recorded Investment, With an allowance recorded, Total | 4,110 | 3,820 | 4,363 | 4,638 | 4,548
Interest Income Recognized, With an allowance recorded, Total | 20 | 14 | 54 | 35 | 91
Recorded Investment, Total | 11,212 | 11,772 | 11,212 | 11,772 | 10,722
Unpaid Principal Balance, Total | 12,738 | 13,226 | 12,738 | 13,226 | 11,963
Related Allowance, With an allowance recorded, Total | 931 | 1,706 | 931 | 1,706 | 766
Average Recorded Investment, Total | 10,879 | 11,117 | 11,036 | 11,822 | 11,601
Interest Income Recognized, Total | 49 | 52 | 139 | 127 | 179
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,356 | 2,310 | 1,356 | 2,310 | 1,279
Unpaid Principal Balance, With no related allowance, Total | 1,538 | 2,455 | 1,538 | 2,455 | 1,439
Average Recorded Investment, With no related allowance, Total | 1,269 | 1,945 | 1,257 | 1,765 | 1,668
Interest Income Recognized, With no related allowance, Total | 17 | 28 | 50 | 63 | 43
Recorded Investment, With an allowance recorded, Total | 939 | 833 | 939 | 833 | 1,184
Unpaid Principal Balance, With an allowance recorded, Total | 1,086 | 910 | 1,086 | 910 | 1,218
Related Allowance, With an allowance recorded, Total | 93 | 436 | 93 | 436 | 159
Average Recorded Investment, With an allowance recorded, Total | 1,020 | 783 | 1,089 | 943 | 991
Interest Income Recognized, With an allowance recorded, Total | 7 |  | 23 |  | 50
Recorded Investment, Total | 2,295 | 3,143 | 2,295 | 3,143 | 2,463
Unpaid Principal Balance, Total | 2,624 | 3,365 | 2,624 | 3,365 | 2,657
Related Allowance, With an allowance recorded, Total | 93 | 436 | 93 | 436 | 159
Average Recorded Investment, Total | 2,289 | 2,728 | 2,346 | 2,708 | 2,659
Interest Income Recognized, Total | 24 | 28 | 73 | 63 | 93
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 3,414 | 2,900 | 3,414 | 2,900 | 2,888
Unpaid Principal Balance, With no related allowance, Total | 3,666 | 3,192 | 3,666 | 3,192 | 3,190
Average Recorded Investment, With no related allowance, Total | 3,143 | 2,979 | 3,036 | 3,009 | 2,985
Interest Income Recognized, With no related allowance, Total | 5 | 6 | 20 | 19 | 24
Recorded Investment, With an allowance recorded, Total | 1,669 | 1,807 | 1,669 | 1,807 | 1,401
Unpaid Principal Balance, With an allowance recorded, Total | 1,774 | 2,073 | 1,774 | 2,073 | 1,496
Related Allowance, With an allowance recorded, Total | 462 | 631 | 462 | 631 | 263
Average Recorded Investment, With an allowance recorded, Total | 1,712 | 1,673 | 1,807 | 2,402 | 2,202
Interest Income Recognized, With an allowance recorded, Total | 8 | 6 | 18 | 13 | 18
Recorded Investment, Total | 5,083 | 4,707 | 5,083 | 4,707 | 4,289
Unpaid Principal Balance, Total | 5,440 | 5,265 | 5,440 | 5,265 | 4,686
Related Allowance, With an allowance recorded, Total | 462 | 631 | 462 | 631 | 263
Average Recorded Investment, Total | 4,855 | 4,652 | 4,843 | 5,411 | 5,187
Interest Income Recognized, Total | 13 | 12 | 38 | 32 | 42
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,366 | 2,303 | 2,366 | 2,303 | 2,196
Unpaid Principal Balance, With no related allowance, Total | 3,003 | 2,727 | 3,003 | 2,727 | 2,672
Average Recorded Investment, With no related allowance, Total | 2,256 | 2,193 | 2,249 | 2,235 | 2,227
Interest Income Recognized, With no related allowance, Total | 7 | 4 | 15 | 10 | 21
Recorded Investment, With an allowance recorded, Total | 1,312 | 1,425 | 1,312 | 1,425 | 1,597
Unpaid Principal Balance, With an allowance recorded, Total | 1,508 | 1,663 | 1,508 | 1,663 | 1,759
Related Allowance, With an allowance recorded, Total | 362 | 616 | 362 | 616 | 336
Average Recorded Investment, With an allowance recorded, Total | 1,369 | 1,330 | 1,456 | 1,270 | 1,335
Interest Income Recognized, With an allowance recorded, Total | 5 | 8 | 13 | 22 | 23
Recorded Investment, Total | 3,678 | 3,728 | 3,678 | 3,728 | 3,793
Unpaid Principal Balance, Total | 4,511 | 4,390 | 4,511 | 4,390 | 4,431
Related Allowance, With an allowance recorded, Total | 362 | 616 | 362 | 616 | 336
Average Recorded Investment, Total | 3,625 | 3,523 | 3,705 | 3,505 | 3,562
Interest Income Recognized, Total | 12 | 12 | 28 | 32 | 44
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 142 | 171 | 142 | 171 | 169
Unpaid Principal Balance, With no related allowance, Total | 149 | 183 | 149 | 183 | 181
Average Recorded Investment, With no related allowance, Total | 101 | 180 | 131 | 175 | 173
Recorded Investment, With an allowance recorded, Total | 14 | 23 | 14 | 23 | 8
Unpaid Principal Balance, With an allowance recorded, Total | 14 | 23 | 14 | 23 | 8
Related Allowance, With an allowance recorded, Total | 14 | 23 | 14 | 23 | 8
Average Recorded Investment, With an allowance recorded, Total | 9 | 34 | 11 | 23 | 20
Recorded Investment, Total | 156 | 194 | 156 | 194 | 177
Unpaid Principal Balance, Total | 163 | 206 | 163 | 206 | 189
Related Allowance, With an allowance recorded, Total | 14 | 23 | 14 | 23 | 8
Average Recorded Investment, Total | $ 110 | $ 214 | $ 142 | $ 198 | $ 193

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