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Servicing Rights - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]          
Commercial servicing rights $ 10,836   $ 10,836   $ 10,821
Other Noninterest Income          
Servicing Assets at Fair Value [Line Items]          
Mortgage servicing fees 588 $ 443 1,100 $ 866  
Commercial servicing rights          
Servicing Assets at Fair Value [Line Items]          
Commercial servicing rights 999   999   1,030
Commercial loans serviced for a third party $ 232,400   $ 232,400   $ 239,500
Constant prepayment rate     12.72%   12.72%
Discount rate     11.49%   11.49%