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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Guarantees [Abstract]    
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
Amounts of off-balance Sheet commitments $ 329,822 $ 266,570