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MORTGAGE SERVICING RIGHTS - Balance of loans serviced for others and fair value of mortgage servicing rights (Details) - Balance of loans serviced for others and fair value of mortgage servicing rights - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2014
Dec. 31, 2016
Residential mortgage loans serviced for others $ 123,925 $ 125,243  
Fair value of mortgage servicing rights $ 810   $ 902