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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 6,621 | $ 7,013 | $ 6,532
Unpaid Principal Balance, With no related allowance, Total | 7,608 | 8,471 | 7,482
Average Recorded Investment, With no related allowance, Total | 6,578 | 7,071 | 7,053
Interest Income Recognized, With no related allowance, Total | 27 | 12 | 88
Recorded Investment, With an allowance recorded, Total | 5,044 | 4,461 | 4,190
Unpaid Principal Balance, With an allowance recorded, Total | 5,673 | 4,461 | 4,481
Related Allowance, With an allowance recorded, Total | 1,755 | 1,424 | 766
Average Recorded Investment, With an allowance recorded, Total | 4,618 | 5,457 | 4,548
Interest Income Recognized, With an allowance recorded, Total | 18 | 23 | 91
Recorded Investment, Total | 11,665 | 11,474 | 10,722
Unpaid Principal Balance, Total | 13,281 | 12,932 | 11,963
Related Allowance, With an allowance recorded, Total | 1,755 | 1,424 | 766
Average Recorded Investment, Total | 11,196 | 12,528 | 11,601
Interest Income Recognized, Total | 45 | 35 | 179
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,211 | 765 | 1,279
Unpaid Principal Balance, With no related allowance, Total | 1,375 | 1,386 | 1,439
Average Recorded Investment, With no related allowance, Total | 1,246 | 1,585 | 1,668
Interest Income Recognized, With no related allowance, Total | 17 | 4 | 43
Recorded Investment, With an allowance recorded, Total | 1,133 | 1,923 | 1,184
Unpaid Principal Balance, With an allowance recorded, Total | 1,158 | 1,923 | 1,218
Related Allowance, With an allowance recorded, Total | 144 | 404 | 159
Average Recorded Investment, With an allowance recorded, Total | 1,159 | 1,103 | 991
Interest Income Recognized, With an allowance recorded, Total | 8 | 13 | 50
Recorded Investment, Total | 2,344 | 2,688 | 2,463
Unpaid Principal Balance, Total | 2,533 | 3,309 | 2,657
Related Allowance, With an allowance recorded, Total | 144 | 404 | 159
Average Recorded Investment, Total | 2,405 | 2,688 | 2,659
Interest Income Recognized, Total | 25 | 17 | 93
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,970 | 3,715 | 2,888
Unpaid Principal Balance, With no related allowance, Total | 3,312 | 4,368 | 3,190
Average Recorded Investment, With no related allowance, Total | 2,929 | 3,039 | 2,985
Interest Income Recognized, With no related allowance, Total | 6 | 4 | 24
Recorded Investment, With an allowance recorded, Total | 2,402 | 1,471 | 1,401
Unpaid Principal Balance, With an allowance recorded, Total | 2,520 | 1,471 | 1,496
Related Allowance, With an allowance recorded, Total | 1,411 | 513 | 263
Average Recorded Investment, With an allowance recorded, Total | 1,902 | 3,132 | 2,202
Interest Income Recognized, With an allowance recorded, Total | 6 | 6 | 18
Recorded Investment, Total | 5,372 | 5,186 | 4,289
Unpaid Principal Balance, Total | 5,832 | 5,839 | 4,686
Related Allowance, With an allowance recorded, Total | 1,411 | 513 | 263
Average Recorded Investment, Total | 4,831 | 6,171 | 5,187
Interest Income Recognized, Total | 12 | 10 | 42
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,289 | 2,349 | 2,196
Unpaid Principal Balance, With no related allowance, Total | 2,762 | 2,533 | 2,672
Average Recorded Investment, With no related allowance, Total | 2,243 | 2,277 | 2,227
Interest Income Recognized, With no related allowance, Total | 4 | 4 | 21
Recorded Investment, With an allowance recorded, Total | 1,491 | 1,044 | 1,597
Unpaid Principal Balance, With an allowance recorded, Total | 1,977 | 1,044 | 1,759
Related Allowance, With an allowance recorded, Total | 182 | 484 | 336
Average Recorded Investment, With an allowance recorded, Total | 1,544 | 1,210 | 1,335
Interest Income Recognized, With an allowance recorded, Total | 4 | 4 | 23
Recorded Investment, Total | 3,780 | 3,393 | 3,793
Unpaid Principal Balance, Total | 4,739 | 3,577 | 4,431
Related Allowance, With an allowance recorded, Total | 182 | 484 | 336
Average Recorded Investment, Total | 3,787 | 3,487 | 3,562
Interest Income Recognized, Total | 8 | 8 | 44
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 151 | 184 | 169
Unpaid Principal Balance, With no related allowance, Total | 159 | 184 | 181
Average Recorded Investment, With no related allowance, Total | 160 | 170 | 173
Recorded Investment, With an allowance recorded, Total | 18 | 23 | 8
Unpaid Principal Balance, With an allowance recorded, Total | 18 | 23 | 8
Related Allowance, With an allowance recorded, Total | 18 | 23 | 8
Average Recorded Investment, With an allowance recorded, Total | 13 | 12 | 20
Recorded Investment, Total | 169 | 207 | 177
Unpaid Principal Balance, Total | 177 | 207 | 189
Related Allowance, With an allowance recorded, Total | 18 | 23 | 8
Average Recorded Investment, Total | $ 173 | $ 182 | $ 193

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