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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 7,684 | $ 9,485 | $ 7,684 | $ 9,485 | $ 7,128
Unpaid Principal Balance, With no related allowance, Total | 8,557 | 11,230 | 8,557 | 11,230 | 8,774
Average Recorded Investment, With no related allowance, Total | 7,297 | 9,199 | 7,184 | 7,992 | 8,041
Interest Income Recognized, With no related allowance, Total | 38 | 22 | 92 | 124 | 154
Recorded Investment, With an allowance recorded, Total | 4,088 | 3,273 | 4,088 | 3,273 | 6,451
Unpaid Principal Balance, With an allowance recorded, Total | 4,669 | 3,273 | 4,669 | 3,273 | 6,452
Related Allowance, With an allowance recorded, Total | 1,706 | 1,911 | 1,706 | 1,911 | 1,942
Average Recorded Investment, With an allowance recorded, Total | 3,820 | 3,069 | 4,638 | 4,174 | 4,460
Interest Income Recognized, With an allowance recorded, Total | 14 |  | 35 | 4 | 9
Recorded Investment, Total | 11,772 | 12,758 | 11,772 | 12,758 | 13,579
Unpaid Principal Balance, Total | 13,226 | 14,503 | 13,226 | 14,503 | 15,226
Related Allowance, With an allowance recorded, Total | 1,706 | 1,911 | 1,706 | 1,911 | 1,942
Average Recorded Investment, Total | 11,117 | 12,268 | 11,822 | 12,166 | 12,501
Interest Income Recognized, Total | 52 | 22 | 127 | 128 | 163
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,310 | 970 | 2,310 | 970 | 2,404
Unpaid Principal Balance, With no related allowance, Total | 2,455 | 1,876 | 2,455 | 1,876 | 3,213
Average Recorded Investment, With no related allowance, Total | 1,945 | 1,133 | 1,765 | 1,214 | 1,461
Interest Income Recognized, With no related allowance, Total | 28 | 10 | 63 | 40 | 48
Recorded Investment, With an allowance recorded, Total | 833 | 1,396 | 833 | 1,396 | 283
Unpaid Principal Balance, With an allowance recorded, Total | 910 | 1,396 | 910 | 1,396 | 283
Related Allowance, With an allowance recorded, Total | 436 | 895 | 436 | 895 | 225
Average Recorded Investment, With an allowance recorded, Total | 783 | 1,006 | 943 | 954 | 859
Recorded Investment, Total | 3,143 | 2,366 | 3,143 | 2,366 | 2,687
Unpaid Principal Balance, Total | 3,365 | 3,272 | 3,365 | 3,272 | 3,496
Related Allowance, With an allowance recorded, Total | 436 | 895 | 436 | 895 | 225
Average Recorded Investment, Total | 2,728 | 2,139 | 2,708 | 2,168 | 2,320
Interest Income Recognized, Total | 28 | 10 | 63 | 40 | 48
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,900 | 6,156 | 2,900 | 6,156 | 2,364
Unpaid Principal Balance, With no related allowance, Total | 3,192 | 6,812 | 3,192 | 6,812 | 3,018
Average Recorded Investment, With no related allowance, Total | 2,979 | 5,837 | 3,009 | 4,396 | 4,300
Interest Income Recognized, With no related allowance, Total | 6 | 9 | 19 | 70 | 71
Recorded Investment, With an allowance recorded, Total | 1,807 | 743 | 1,807 | 743 | 4,793
Unpaid Principal Balance, With an allowance recorded, Total | 2,073 | 743 | 2,073 | 743 | 4,793
Related Allowance, With an allowance recorded, Total | 631 | 337 | 631 | 337 | 1,197
Average Recorded Investment, With an allowance recorded, Total | 1,673 | 821 | 2,402 | 1,877 | 2,366
Interest Income Recognized, With an allowance recorded, Total | 6 |  | 13 |  | 2
Recorded Investment, Total | 4,707 | 6,899 | 4,707 | 6,899 | 7,157
Unpaid Principal Balance, Total | 5,265 | 7,555 | 5,265 | 7,555 | 7,811
Related Allowance, With an allowance recorded, Total | 631 | 337 | 631 | 337 | 1,197
Average Recorded Investment, Total | 4,652 | 6,658 | 5,411 | 6,273 | 6,666
Interest Income Recognized, Total | 12 | 9 | 32 | 70 | 73
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,303 | 2,171 | 2,303 | 2,171 | 2,205
Unpaid Principal Balance, With no related allowance, Total | 2,727 | 2,354 | 2,727 | 2,354 | 2,388
Average Recorded Investment, With no related allowance, Total | 2,193 | 2,056 | 2,235 | 2,263 | 2,133
Interest Income Recognized, With no related allowance, Total | 4 | 3 | 10 | 14 | 35
Recorded Investment, With an allowance recorded, Total | 1,425 | 1,093 | 1,425 | 1,093 | 1,375
Unpaid Principal Balance, With an allowance recorded, Total | 1,663 | 1,093 | 1,663 | 1,093 | 1,376
Related Allowance, With an allowance recorded, Total | 616 | 638 | 616 | 638 | 520
Average Recorded Investment, With an allowance recorded, Total | 1,330 | 1,186 | 1,270 | 1,263 | 1,185
Interest Income Recognized, With an allowance recorded, Total | 8 |  | 22 | 4 | 7
Recorded Investment, Total | 3,728 | 3,264 | 3,728 | 3,264 | 3,580
Unpaid Principal Balance, Total | 4,390 | 3,447 | 4,390 | 3,447 | 3,764
Related Allowance, With an allowance recorded, Total | 616 | 638 | 616 | 638 | 520
Average Recorded Investment, Total | 3,523 | 3,242 | 3,505 | 3,526 | 3,318
Interest Income Recognized, Total | 12 | 3 | 32 | 18 | 42
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 171 | 188 | 171 | 188 | 155
Unpaid Principal Balance, With no related allowance, Total | 183 | 188 | 183 | 188 | 155
Average Recorded Investment, With no related allowance, Total | 180 | 173 | 175 | 119 | 147
Recorded Investment, With an allowance recorded, Total | 23 | 41 | 23 | 41 |
Unpaid Principal Balance, With an allowance recorded, Total | 23 | 41 | 23 | 41 |
Related Allowance, With an allowance recorded, Total | 23 | 41 | 23 | 41 |
Average Recorded Investment, With an allowance recorded, Total | 34 | 56 | 23 | 80 | 50
Recorded Investment, Total | 194 | 229 | 194 | 229 | 155
Unpaid Principal Balance, Total | 206 | 229 | 206 | 229 | 155
Related Allowance, With an allowance recorded, Total | 23 | 41 | 23 | 41 |
Average Recorded Investment, Total | $ 214 | $ 229 | $ 198 | $ 199 | $ 197

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