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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 6,909 | $ 8,911 | $ 6,909 | $ 8,911 | $ 7,128
Unpaid Principal Balance, With no related allowance, Total | 8,356 | 10,840 | 8,356 | 10,840 | 8,774
Average Recorded Investment, With no related allowance, Total | 6,962 | 7,777 | 7,016 | 7,339 | 8,041
Interest Income Recognized, With no related allowance, Total | 29 | 47 | 54 | 102 | 154
Recorded Investment, With an allowance recorded, Total | 3,548 | 2,864 | 3,548 | 2,864 | 6,451
Unpaid Principal Balance, With an allowance recorded, Total | 3,548 | 2,864 | 3,548 | 2,864 | 6,452
Related Allowance, With an allowance recorded, Total | 1,335 | 1,814 | 1,335 | 1,814 | 1,942
Average Recorded Investment, With an allowance recorded, Total | 4,006 | 4,058 | 4,820 | 4,710 | 4,460
Interest Income Recognized, With an allowance recorded, Total | 11 | 2 | 21 | 4 | 9
Recorded Investment, Total | 10,457 | 11,775 | 10,457 | 11,775 | 13,579
Unpaid Principal Balance, Total | 11,904 | 13,704 | 11,904 | 13,704 | 15,226
Related Allowance, With an allowance recorded, Total | 1,335 | 1,814 | 1,335 | 1,814 | 1,942
Average Recorded Investment, Total | 10,968 | 11,835 | 11,836 | 12,049 | 12,501
Interest Income Recognized, Total | 40 | 49 | 75 | 106 | 163
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,580 | 1,296 | 1,580 | 1,296 | 2,404
Unpaid Principal Balance, With no related allowance, Total | 2,197 | 2,378 | 2,197 | 2,378 | 3,213
Average Recorded Investment, With no related allowance, Total | 1,173 | 1,235 | 1,583 | 1,249 | 1,461
Interest Income Recognized, With no related allowance, Total | 18 | 14 | 35 | 30 | 48
Recorded Investment, With an allowance recorded, Total | 732 | 615 | 732 | 615 | 283
Unpaid Principal Balance, With an allowance recorded, Total | 732 | 615 | 732 | 615 | 283
Related Allowance, With an allowance recorded, Total | 321 | 615 | 321 | 615 | 225
Average Recorded Investment, With an allowance recorded, Total | 1,328 | 878 | 979 | 923 | 859
Recorded Investment, Total | 2,312 | 1,911 | 2,312 | 1,911 | 2,687
Unpaid Principal Balance, Total | 2,929 | 2,993 | 2,929 | 2,993 | 3,496
Related Allowance, With an allowance recorded, Total | 321 | 615 | 321 | 615 | 225
Average Recorded Investment, Total | 2,501 | 2,113 | 2,562 | 2,172 | 2,320
Interest Income Recognized, Total | 18 | 14 | 35 | 30 | 48
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 3,058 | 5,517 | 3,058 | 5,517 | 2,364
Unpaid Principal Balance, With no related allowance, Total | 3,706 | 6,181 | 3,706 | 6,181 | 3,018
Average Recorded Investment, With no related allowance, Total | 3,387 | 4,340 | 3,045 | 3,643 | 4,300
Interest Income Recognized, With no related allowance, Total | 7 | 30 | 13 | 61 | 71
Recorded Investment, With an allowance recorded, Total | 1,538 | 899 | 1,538 | 899 | 4,793
Unpaid Principal Balance, With an allowance recorded, Total | 1,538 | 899 | 1,538 | 899 | 4,793
Related Allowance, With an allowance recorded, Total | 509 | 405 | 509 | 405 | 1,197
Average Recorded Investment, With an allowance recorded, Total | 1,505 | 1,964 | 2,601 | 2,400 | 2,366
Interest Income Recognized, With an allowance recorded, Total | 3 |  | 7 |  | 2
Recorded Investment, Total | 4,596 | 6,416 | 4,596 | 6,416 | 7,157
Unpaid Principal Balance, Total | 5,244 | 7,080 | 5,244 | 7,080 | 7,811
Related Allowance, With an allowance recorded, Total | 509 | 405 | 509 | 405 | 1,197
Average Recorded Investment, Total | 4,892 | 6,304 | 5,646 | 6,043 | 6,666
Interest Income Recognized, Total | 10 | 30 | 20 | 61 | 73
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,083 | 1,941 | 2,083 | 1,941 | 2,205
Unpaid Principal Balance, With no related allowance, Total | 2,265 | 2,124 | 2,265 | 2,124 | 2,388
Average Recorded Investment, With no related allowance, Total | 2,216 | 2,079 | 2,212 | 2,355 | 2,133
Interest Income Recognized, With no related allowance, Total | 4 | 3 | 6 | 11 | 35
Recorded Investment, With an allowance recorded, Total | 1,234 | 1,279 | 1,234 | 1,279 | 1,375
Unpaid Principal Balance, With an allowance recorded, Total | 1,234 | 1,279 | 1,234 | 1,279 | 1,376
Related Allowance, With an allowance recorded, Total | 461 | 723 | 461 | 723 | 520
Average Recorded Investment, With an allowance recorded, Total | 1,139 | 1,136 | 1,218 | 1,295 | 1,185
Interest Income Recognized, With an allowance recorded, Total | 8 | 2 | 14 | 4 | 7
Recorded Investment, Total | 3,317 | 3,220 | 3,317 | 3,220 | 3,580
Unpaid Principal Balance, Total | 3,499 | 3,403 | 3,499 | 3,403 | 3,764
Related Allowance, With an allowance recorded, Total | 461 | 723 | 461 | 723 | 520
Average Recorded Investment, Total | 3,355 | 3,215 | 3,430 | 3,650 | 3,318
Interest Income Recognized, Total | 12 | 5 | 20 | 15 | 42
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 188 | 157 | 188 | 157 | 155
Unpaid Principal Balance, With no related allowance, Total | 188 | 157 | 188 | 157 | 155
Average Recorded Investment, With no related allowance, Total | 186 | 123 | 176 | 92 | 147
Recorded Investment, With an allowance recorded, Total | 44 | 71 | 44 | 71 |
Unpaid Principal Balance, With an allowance recorded, Total | 44 | 71 | 44 | 71 |
Related Allowance, With an allowance recorded, Total | 44 | 71 | 44 | 71 |
Average Recorded Investment, With an allowance recorded, Total | 34 | 80 | 22 | 92 | 50
Recorded Investment, Total | 232 | 228 | 232 | 228 | 155
Unpaid Principal Balance, Total | 232 | 228 | 232 | 228 | 155
Related Allowance, With an allowance recorded, Total | 44 | 71 | 44 | 71 |
Average Recorded Investment, Total | $ 220 | $ 203 | $ 198 | $ 184 | $ 197

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