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Off-balance sheet financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Guarantees [Abstract] |
Summary of Contractual Amounts of Off-balance Sheet Commitments |
December 31 |  | 2015 |  | 2014 |
Commitments to extend credit |  | $ | 257,011 |  | $ | 187,351 |
Unused portions of lines of credit |  |  | 52,794 |  |  | 48,610 |
Standby letters of credit |  |  | 20,017 |  |  | 30,609 |
|  | $ | 329,822 |  | $ | 266,570 |

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