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Goodwill and Intangible Assets - Changes in Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Changes in the mortgage servicing rights    
Amortization $ (296) $ (653)
Mortgage servicing rights    
Changes in the mortgage servicing rights    
Beginning balance 3,556  
Acquired through acquisition   4,301
Originations 13  
Impairment (54)  
Amortization (153) (171)
Ending balance 3,362 4,130
Fair value of mortgage servicing rights $ 3,564 $ 4,712