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Other assets - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Unpaid principal balances of mortgage loans serviced for others | $ 168,198 | $ 163,822

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Balance Type: | credit
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- References No definition available. + Details
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