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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | $ 7,162 | $ 8,066 | $ 18,568
Unpaid Principal Balance, With no related allowance, Total | 9,390 | 10,714 | 26,353
Average Recorded Investment, With no related allowance, Total | 6,923 | 13,438 | 18,628
Interest Income Recognized, With no related allowance, Total | 186 | 265 |
Recorded Investment, With an allowance recorded, Total | 5,473 | 6,525 | 4,378
Unpaid Principal Balance, With an allowance recorded, Total | 5,473 | 6,525 | 4,378
Related Allowance, With an allowance recorded, Total | 2,247 | 2,959 | 2,024
Average Recorded Investment, With an allowance recorded, Total | 7,737 | 4,680 | 4,263
Interest Income Recognized, With an allowance recorded, Total | 156 | 97 | 184
Recorded Investment, Total | 12,635 | 14,591 | 22,946
Unpaid Principal Balance, Total | 14,863 | 17,239 | 30,731
Related Allowance, With an allowance recorded, Total | 2,247 | 2,959 | 2,024
Average Recorded Investment, Total | 14,660 | 18,118 | 22,891
Interest Income Recognized, Total | 342 | 362 |
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 1,352 | 2,379 | 4,978
Unpaid Principal Balance, With no related allowance, Total | 2,720 | 4,084 | 9,474
Average Recorded Investment, With no related allowance, Total | 1,848 | 2,669 | 5,824
Interest Income Recognized, With no related allowance, Total | 87 | 141 |
Recorded Investment, With an allowance recorded, Total | 795 | 1,569 | 2,200
Unpaid Principal Balance, With an allowance recorded, Total | 795 | 1,569 | 2,200
Related Allowance, With an allowance recorded, Total | 759 | 1,240 | 1,500
Average Recorded Investment, With an allowance recorded, Total | 1,680 | 1,787 | 2,182
Interest Income Recognized, With an allowance recorded, Total | 40 | 58 | 95
Recorded Investment, Total | 2,147 | 3,948 | 7,178
Unpaid Principal Balance, Total | 3,515 | 5,653 | 11,674
Related Allowance, With an allowance recorded, Total | 759 | 1,240 | 1,500
Average Recorded Investment, Total | 3,528 | 4,456 | 8,006
Interest Income Recognized, Total | 127 | 199 |
Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 2,731 | 2,932 | 10,496
Unpaid Principal Balance, With no related allowance, Total | 3,408 | 3,690 | 13,352
Average Recorded Investment, With no related allowance, Total | 2,394 | 7,944 | 10,095
Interest Income Recognized, With no related allowance, Total | 95 | 120 |
Recorded Investment, With an allowance recorded, Total | 2,643 | 3,525 | 1,394
Unpaid Principal Balance, With an allowance recorded, Total | 2,643 | 3,525 | 1,394
Related Allowance, With an allowance recorded, Total | 233 | 912 | 300
Average Recorded Investment, With an allowance recorded, Total | 4,155 | 2,293 | 1,409
Interest Income Recognized, With an allowance recorded, Total | 86 | 28 | 76
Recorded Investment, Total | 5,374 | 6,457 | 11,890
Unpaid Principal Balance, Total | 6,051 | 7,215 | 14,746
Related Allowance, With an allowance recorded, Total | 233 | 912 | 300
Average Recorded Investment, Total | 6,549 | 10,237 | 11,504
Interest Income Recognized, Total | 181 | 148 |
Real Estate Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 3,048 | 2,672 | 3,004
Unpaid Principal Balance, With no related allowance, Total | 3,231 | 2,857 | 3,437
Average Recorded Investment, With no related allowance, Total | 2,664 | 2,731 | 2,614
Interest Income Recognized, With no related allowance, Total | 4 | 4 |
Recorded Investment, With an allowance recorded, Total | 1,918 | 1,387 | 784
Unpaid Principal Balance, With an allowance recorded, Total | 1,918 | 1,387 | 784
Related Allowance, With an allowance recorded, Total | 1,138 | 769 | 224
Average Recorded Investment, With an allowance recorded, Total | 1,776 | 590 | 672
Interest Income Recognized, With an allowance recorded, Total | 30 | 10 | 13
Recorded Investment, Total | 4,966 | 4,059 | 3,788
Unpaid Principal Balance, Total | 5,149 | 4,244 | 4,221
Related Allowance, With an allowance recorded, Total | 1,138 | 769 | 224
Average Recorded Investment, Total | 4,440 | 3,321 | 3,286
Interest Income Recognized, Total | 34 | 14 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 31 | 83 | 90
Unpaid Principal Balance, With no related allowance, Total | 31 | 83 | 90
Average Recorded Investment, With no related allowance, Total | 17 | 94 | 95
Recorded Investment, With an allowance recorded, Total | 117 | 44 |
Unpaid Principal Balance, With an allowance recorded, Total | 117 | 44 |
Related Allowance, With an allowance recorded, Total | 117 | 38 |
Average Recorded Investment, With an allowance recorded, Total | 126 | 10 |
Interest Income Recognized, With an allowance recorded, Total |  | 1 |
Recorded Investment, Total | 148 | 127 | 90
Unpaid Principal Balance, Total | 148 | 127 | 90
Related Allowance, With an allowance recorded, Total | 117 | 38 |
Average Recorded Investment, Total | $ 143 | 104 | $ 95
Interest Income Recognized, Total |  | $ 1 |

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