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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 7,013 | $ 6,640 | $ 7,128
Unpaid Principal Balance, With no related allowance, Total | 8,471 | 8,703 | 8,774
Average Recorded Investment, With no related allowance, Total | 7,071 | 6,902 | 8,041
Interest Income Recognized, With no related allowance, Total | 12 | 50 | 154
Recorded Investment, With an allowance recorded, Total | 4,461 | 5,250 | 6,451
Unpaid Principal Balance, With an allowance recorded, Total | 4,461 | 5,250 | 6,452
Related Allowance, With an allowance recorded, Total | 1,424 | 2,203 | 1,942
Average Recorded Investment, With an allowance recorded, Total | 5,457 | 5,362 | 4,460
Interest Income Recognized, With an allowance recorded, Total | 23 | 2 | 9
Recorded Investment, Total | 11,474 | 11,890 | 13,579
Unpaid Principal Balance, Total | 12,932 | 13,953 | 15,226
Related Allowance, With an allowance recorded, Total | 1,424 | 2,203 | 1,942
Average Recorded Investment, Total | 12,528 | 12,264 | 12,501
Interest Income Recognized, Total | 35 | 52 | 163
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 765 | 1,173 | 2,404
Unpaid Principal Balance, With no related allowance, Total | 1,386 | 2,383 | 3,213
Average Recorded Investment, With no related allowance, Total | 1,585 | 1,263 | 1,461
Interest Income Recognized, With no related allowance, Total | 4 | 17 | 48
Recorded Investment, With an allowance recorded, Total | 1,923 | 1,141 | 283
Unpaid Principal Balance, With an allowance recorded, Total | 1,923 | 1,141 | 283
Related Allowance, With an allowance recorded, Total | 404 | 1,040 | 225
Average Recorded Investment, With an allowance recorded, Total | 1,103 | 968 | 859
Interest Income Recognized, With an allowance recorded, Total | 13 |  |
Recorded Investment, Total | 2,688 | 2,314 | 2,687
Unpaid Principal Balance, Total | 3,309 | 3,524 | 3,496
Related Allowance, With an allowance recorded, Total | 404 | 1,040 | 225
Average Recorded Investment, Total | 2,688 | 2,231 | 2,320
Interest Income Recognized, Total | 17 | 17 | 48
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 3,715 | 3,162 | 2,364
Unpaid Principal Balance, With no related allowance, Total | 4,368 | 3,832 | 3,018
Average Recorded Investment, With no related allowance, Total | 3,039 | 2,947 | 4,300
Interest Income Recognized, With no related allowance, Total | 4 | 32 | 71
Recorded Investment, With an allowance recorded, Total | 1,471 | 3,028 | 4,793
Unpaid Principal Balance, With an allowance recorded, Total | 1,471 | 3,028 | 4,793
Related Allowance, With an allowance recorded, Total | 513 | 541 | 1,197
Average Recorded Investment, With an allowance recorded, Total | 3,132 | 2,836 | 2,366
Interest Income Recognized, With an allowance recorded, Total | 6 |  | 2
Recorded Investment, Total | 5,186 | 6,190 | 7,157
Unpaid Principal Balance, Total | 5,839 | 6,860 | 7,811
Related Allowance, With an allowance recorded, Total | 513 | 541 | 1,197
Average Recorded Investment, Total | 6,171 | 5,783 | 6,666
Interest Income Recognized, Total | 10 | 32 | 73
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,349 | 2,216 | 2,205
Unpaid Principal Balance, With no related allowance, Total | 2,533 | 2,399 | 2,388
Average Recorded Investment, With no related allowance, Total | 2,277 | 2,632 | 2,133
Interest Income Recognized, With no related allowance, Total | 4 | 1 | 35
Recorded Investment, With an allowance recorded, Total | 1,044 | 992 | 1,375
Unpaid Principal Balance, With an allowance recorded, Total | 1,044 | 992 | 1,376
Related Allowance, With an allowance recorded, Total | 484 | 533 | 520
Average Recorded Investment, With an allowance recorded, Total | 1,210 | 1,455 | 1,185
Interest Income Recognized, With an allowance recorded, Total | 4 | 2 | 7
Recorded Investment, Total | 3,393 | 3,208 | 3,580
Unpaid Principal Balance, Total | 3,577 | 3,391 | 3,764
Related Allowance, With an allowance recorded, Total | 484 | 533 | 520
Average Recorded Investment, Total | 3,487 | 4,087 | 3,318
Interest Income Recognized, Total | 8 | 3 | 42
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 184 | 89 | 155
Unpaid Principal Balance, With no related allowance, Total | 184 | 89 | 155
Average Recorded Investment, With no related allowance, Total | 170 | 60 | 147
Recorded Investment, With an allowance recorded, Total | 23 | 89 |
Unpaid Principal Balance, With an allowance recorded, Total | 23 | 89 |
Related Allowance, With an allowance recorded, Total | 23 | 89 |
Average Recorded Investment, With an allowance recorded, Total | 12 | 103 | 50
Recorded Investment, Total | 207 | 178 | 155
Unpaid Principal Balance, Total | 207 | 178 | 155
Related Allowance, With an allowance recorded, Total | 23 | 89 |
Average Recorded Investment, Total | $ 182 | $ 163 | $ 197

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