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Loans, net and allowance for loan losses - Summarized Information in Concerning to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | $ 6,532 | $ 7,128 | $ 7,162
Unpaid Principal Balance, With no related allowance, Total | 7,482 | 8,774 | 9,390
Average Recorded Investment, With no related allowance, Total | 7,053 | 8,041 | 6,923
Interest Income Recognized, With no related allowance, Total | 88 | 154 | 186
Recorded Investment, With an allowance recorded, Total | 4,190 | 6,451 | 5,473
Unpaid Principal Balance, With an allowance recorded, Total | 4,481 | 6,452 | 5,473
Related Allowance, With an allowance recorded, Total | 766 | 1,942 | 2,247
Average Recorded Investment, With an allowance recorded, Total | 4,548 | 4,460 | 7,737
Interest Income Recognized, With an allowance recorded, Total | 91 | 9 | 156
Recorded Investment, Total | 10,722 | 13,579 | 12,635
Unpaid Principal Balance, Total | 11,963 | 15,226 | 14,863
Related Allowance, With an allowance recorded, Total | 766 | 1,942 | 2,247
Average Recorded Investment, Total | 11,601 | 12,501 | 14,660
Interest Income Recognized, Total | 179 | 163 | 342
Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 1,279 | 2,404 | 1,352
Unpaid Principal Balance, With no related allowance, Total | 1,439 | 3,213 | 2,720
Average Recorded Investment, With no related allowance, Total | 1,668 | 1,461 | 1,848
Interest Income Recognized, With no related allowance, Total | 43 | 48 | 87
Recorded Investment, With an allowance recorded, Total | 1,184 | 283 | 795
Unpaid Principal Balance, With an allowance recorded, Total | 1,218 | 283 | 795
Related Allowance, With an allowance recorded, Total | 159 | 225 | 759
Average Recorded Investment, With an allowance recorded, Total | 991 | 859 | 1,680
Interest Income Recognized, With an allowance recorded, Total | 50 |  | 40
Recorded Investment, Total | 2,463 | 2,687 | 2,147
Unpaid Principal Balance, Total | 2,657 | 3,496 | 3,515
Related Allowance, With an allowance recorded, Total | 159 | 225 | 759
Average Recorded Investment, Total | 2,659 | 2,320 | 3,528
Interest Income Recognized, Total | 93 | 48 | 127
Real estate Commercial |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,888 | 2,364 | 2,731
Unpaid Principal Balance, With no related allowance, Total | 3,190 | 3,018 | 3,408
Average Recorded Investment, With no related allowance, Total | 2,985 | 4,300 | 2,394
Interest Income Recognized, With no related allowance, Total | 24 | 71 | 95
Recorded Investment, With an allowance recorded, Total | 1,401 | 4,793 | 2,643
Unpaid Principal Balance, With an allowance recorded, Total | 1,496 | 4,793 | 2,643
Related Allowance, With an allowance recorded, Total | 263 | 1,197 | 233
Average Recorded Investment, With an allowance recorded, Total | 2,202 | 2,366 | 4,155
Interest Income Recognized, With an allowance recorded, Total | 18 | 2 | 86
Recorded Investment, Total | 4,289 | 7,157 | 5,374
Unpaid Principal Balance, Total | 4,686 | 7,811 | 6,051
Related Allowance, With an allowance recorded, Total | 263 | 1,197 | 233
Average Recorded Investment, Total | 5,187 | 6,666 | 6,549
Interest Income Recognized, Total | 42 | 73 | 181
Real estate Residential |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 2,196 | 2,205 | 3,048
Unpaid Principal Balance, With no related allowance, Total | 2,672 | 2,388 | 3,231
Average Recorded Investment, With no related allowance, Total | 2,227 | 2,133 | 2,664
Interest Income Recognized, With no related allowance, Total | 21 | 35 | 4
Recorded Investment, With an allowance recorded, Total | 1,597 | 1,375 | 1,918
Unpaid Principal Balance, With an allowance recorded, Total | 1,759 | 1,376 | 1,918
Related Allowance, With an allowance recorded, Total | 336 | 520 | 1,138
Average Recorded Investment, With an allowance recorded, Total | 1,335 | 1,185 | 1,776
Interest Income Recognized, With an allowance recorded, Total | 23 | 7 | 30
Recorded Investment, Total | 3,793 | 3,580 | 4,966
Unpaid Principal Balance, Total | 4,431 | 3,764 | 5,149
Related Allowance, With an allowance recorded, Total | 336 | 520 | 1,138
Average Recorded Investment, Total | 3,562 | 3,318 | 4,440
Interest Income Recognized, Total | 44 | 42 | 34
Consumer |  |  |
Financing Receivable, Impaired |  |  |
Recorded Investment, With no related allowance, Total | 169 | 155 | 31
Unpaid Principal Balance, With no related allowance, Total | 181 | 155 | 31
Average Recorded Investment, With no related allowance, Total | 173 | 147 | 17
Recorded Investment, With an allowance recorded, Total | 8 |  | 117
Unpaid Principal Balance, With an allowance recorded, Total | 8 |  | 117
Related Allowance, With an allowance recorded, Total | 8 |  | 117
Average Recorded Investment, With an allowance recorded, Total | 20 | 50 | 126
Recorded Investment, Total | 177 | 155 | 148
Unpaid Principal Balance, Total | 189 | 155 | 148
Related Allowance, With an allowance recorded, Total | 8 |  | 117
Average Recorded Investment, Total | $ 193 | $ 197 | $ 143

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