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Off-balance sheet financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
Guarantees [Abstract] |
Summary of Contractual Amounts of Off-balance Sheet Commitments | The contractual amounts of off-balance sheet commitments at December 31, 2014 and 2013 are summarized as follows:
December 31 |  | 2014 |  |  | 2013 |
Commitments to extend credit |  | $ | 187,351 |  |  | $ | 221,138 |
Unused portions of lines of credit |  |  | 48,610 |  |  |  | 52,257 |
Standby letters of credit |  |  | 30,609 |  |  |  | 29,914 |
|  | $ | 266,570 |  |  | $ | 303,309 |

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