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Time deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
2017 $ 154,098  
2018 31,931  
2019 16,516  
2020 12,357  
2021 4,755  
Thereafter 705  
Total $ 220,362 $ 175,697