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Off-balance sheet financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2013
Guarantees [Abstract] |
Summary of Contractual Amounts of Off-balance Sheet Commitments | The contractual amounts of off-balance sheet commitments at December 31, 2013 and 2012 are summarized as follows:
December 31 |  | 2013 |  |  | 2012 |
Commitments to extend credit |  | $ | 221,138 |  |  | $ | 128,540 |
Unused portions of lines of credit |  |  | 52,257 |  |  |  | 46,377 |
Standby letters of credit |  |  | 29,914 |  |  |  | 14,440 |
|  | $ | 303,309 |  |  | $ | 189,357 |

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