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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Details 8) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 6,755 | $ 10,320 | $ 6,755 | $ 10,320 | $ 8,066
Unpaid Principal Balance, With no related allowance, Total | 9,093 | 13,030 | 9,093 | 13,030 | 10,714
Average Recorded Investment, With no related allowance, Total | 6,644 | 12,844 | 6,911 | 14,868 | 13,438
Interest Income Recognized, With no related allowance, Total | 59 | 40 | 145 | 132 | 265
Recorded Investment, With an allowance recorded, Total | 9,163 | 6,441 | 9,163 | 6,441 | 6,525
Unpaid Principal Balance, With an allowance recorded, Total | 9,163 | 6,441 | 9,163 | 6,441 | 6,525
Related Allowance, With an allowance recorded, Total | 3,587 | 2,115 | 3,587 | 2,115 | 2,959
Average Recorded Investment, With an allowance recorded, Total | 8,818 | 4,922 | 7,877 | 4,072 | 4,680
Interest Income Recognized, With an allowance recorded, Total | 41 | 38 | 150 | 110 | 97
Recorded Investment, Total | 15,918 | 16,761 | 15,918 | 16,761 | 14,591
Unpaid Principal Balance, Total | 18,256 | 19,471 | 18,256 | 19,471 | 17,239
Related Allowance, With an allowance recorded, Total | 3,587 | 2,115 | 3,587 | 2,115 | 2,959
Average Recorded Investment, Total | 15,462 | 17,766 | 14,788 | 18,940 | 18,118
Interest Income Recognized, Total | 100 | 78 | 295 | 242 | 362
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,561 | 2,352 | 1,561 | 2,352 | 2,379
Unpaid Principal Balance, With no related allowance, Total | 3,024 | 4,076 | 3,024 | 4,076 | 4,084
Average Recorded Investment, With no related allowance, Total | 1,610 | 2,501 | 1,980 | 2,771 | 2,669
Interest Income Recognized, With no related allowance, Total | 33 | 19 | 70 | 71 | 141
Recorded Investment, With an allowance recorded, Total | 2,596 | 1,781 | 2,596 | 1,781 | 1,569
Unpaid Principal Balance, With an allowance recorded, Total | 2,596 | 1,781 | 2,596 | 1,781 | 1,569
Related Allowance, With an allowance recorded, Total | 2,032 | 1,163 | 2,032 | 1,163 | 1,240
Average Recorded Investment, With an allowance recorded, Total | 1,954 | 1,769 | 1,675 | 1,825 | 1,787
Interest Income Recognized, With an allowance recorded, Total | 13 | 20 | 40 | 63 | 58
Recorded Investment, Total | 4,157 | 4,133 | 4,157 | 4,133 | 3,948
Unpaid Principal Balance, Total | 5,620 | 5,857 | 5,620 | 5,857 | 5,653
Related Allowance, With an allowance recorded, Total | 2,032 | 1,163 | 2,032 | 1,163 | 1,240
Average Recorded Investment, Total | 3,564 | 4,270 | 3,655 | 4,596 | 4,456
Interest Income Recognized, Total | 46 | 39 | 110 | 134 | 199
Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,410 | 5,275 | 2,410 | 5,275 | 2,932
Unpaid Principal Balance, With no related allowance, Total | 3,102 | 6,074 | 3,102 | 6,074 | 3,690
Average Recorded Investment, With no related allowance, Total | 2,275 | 7,587 | 2,335 | 9,238 | 7,944
Interest Income Recognized, With no related allowance, Total | 25 | 20 | 72 | 58 | 120
Recorded Investment, With an allowance recorded, Total | 4,277 | 3,893 | 4,277 | 3,893 | 3,525
Unpaid Principal Balance, With an allowance recorded, Total | 4,277 | 3,893 | 4,277 | 3,893 | 3,525
Related Allowance, With an allowance recorded, Total | 376 | 660 | 376 | 660 | 912
Average Recorded Investment, With an allowance recorded, Total | 4,797 | 2,640 | 4,389 | 1,816 | 2,293
Interest Income Recognized, With an allowance recorded, Total | 21 | 14 | 86 | 43 | 28
Recorded Investment, Total | 6,687 | 9,168 | 6,687 | 9,168 | 6,457
Unpaid Principal Balance, Total | 7,379 | 9,967 | 7,379 | 9,967 | 7,215
Related Allowance, With an allowance recorded, Total | 376 | 660 | 376 | 660 | 912
Average Recorded Investment, Total | 7,072 | 10,227 | 6,724 | 11,054 | 10,237
Interest Income Recognized, Total | 46 | 34 | 158 | 101 | 148
Real Estate Residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total | 2,784 | 2,629 | 2,784 | 2,629 | 2,672
Unpaid Principal Balance, With no related allowance, Total | 2,967 | 2,816 | 2,967 | 2,816 | 2,857
Average Recorded Investment, With no related allowance, Total | 2,759 | 2,675 | 2,579 | 2,758 | 2,731
Interest Income Recognized, With no related allowance, Total | 1 | 1 | 3 | 3 | 4
Recorded Investment, With an allowance recorded, Total | 2,099 | 750 | 2,099 | 750 | 1,387
Unpaid Principal Balance, With an allowance recorded, Total | 2,099 | 750 | 2,099 | 750 | 1,387
Related Allowance, With an allowance recorded, Total | 1,000 | 275 | 1,000 | 275 | 769
Average Recorded Investment, With an allowance recorded, Total | 1,903 | 504 | 1,697 | 428 | 590
Interest Income Recognized, With an allowance recorded, Total | 7 | 4 | 24 | 4 | 10
Recorded Investment, Total | 4,883 | 3,379 | 4,883 | 3,379 | 4,059
Unpaid Principal Balance, Total | 5,066 | 3,566 | 5,066 | 3,566 | 4,244
Related Allowance, With an allowance recorded, Total | 1,000 | 275 | 1,000 | 275 | 769
Average Recorded Investment, Total | 4,662 | 3,179 | 4,276 | 3,186 | 3,321
Interest Income Recognized, Total | 8 | 5 | 27 | 7 | 14
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment, With no related allowance, Total |  | 64 |  | 64 | 83
Unpaid Principal Balance, With no related allowance, Total |  | 64 |  | 64 | 83
Average Recorded Investment, With no related allowance, Total |  | 81 | 17 | 101 | 94
Recorded Investment, With an allowance recorded, Total | 191 | 17 | 191 | 17 | 44
Unpaid Principal Balance, With an allowance recorded, Total | 191 | 17 | 191 | 17 | 44
Related Allowance, With an allowance recorded, Total | 179 | 17 | 179 | 17 | 38
Average Recorded Investment, With an allowance recorded, Total | 164 | 9 | 116 | 3 | 10
Interest Income Recognized, With an allowance recorded, Total |  |  |  |  | 1
Recorded Investment, Total | 191 | 81 | 191 | 81 | 127
Unpaid Principal Balance, Total | 191 | 81 | 191 | 81 | 127
Related Allowance, With an allowance recorded, Total | 179 | 17 | 179 | 17 | 38
Average Recorded Investment, Total | $ 164 | $ 90 | $ 133 | $ 104 | 104
Interest Income Recognized, Total |  |  |  |  | $ 1

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