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Loans, net and allowance for loan losses - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) contract loan | Dec. 31, 2014 USD ($) contract loan | Dec. 31, 2013 USD ($) contract loan
Receivables [Abstract] |  |  |
Net deferred loan costs | $ 690,000 | $ 651,000 |
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates | 10,187,000 | 11,913,000 |
Advances and repayments of loans receivable | 20,236,000 | 21,962,000 |
Interest income recognized using the cash-basis method on impaired loans | $ 0 | $ 0 | $ 0
Number of distressed loans | loan | 13 | 29 | 29
Credit adjustment on distressed loans | $ 2,228,000 | $ 6,892,000 | $ 6,892,000
Total impaired loans | 12,635,000 | 14,591,000 | 22,946,000
Impaired loans acquired | 2,368,000 |  |
Remaining fair value adjustment of impaired loans | 2,228,000 |  |
Additional reserve against impaired loans | 107,000 |  |
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk | $ 2,861,000 | $ 2,933,000 | $ 2,487,000
Number of loans modified | contract | 9 | 3 | 0
Number of loans modified as troubled debt restructurings | loan | 2 |  |

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