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Servicing Rights - Key Assumptions and the Sensitivity of the Fair Value (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]            
Aggregate portfolio principal balance $ 634,059 $ 557,583        
Base            
Mortgage servicing rights $ 11,206 $ 10,821        
MSR as a percentage of serviced loans 1.77% 1.94%        
Mortgage servicing rights            
Servicing Assets at Fair Value [Line Items]            
Aggregate portfolio principal balance $ 634,059 $ 557,583        
Weighted average rate of note 3.94% 3.91%        
Base            
Constant prepayment rate 11.51% 7.70%        
Discount rate 8.58% 9.94%        
Mortgage servicing rights $ 11,206 $ 10,821 $ 10,836 $ 9,695 $ 8,733 $ 7,305
MSR as a percentage of serviced loans 1.77% 1.94%        
1.0% Adverse Rate Change            
Constant prepayment rate 28.16% 19.35%        
Discount rate 7.58% 8.94%        
Fair value MSR $ 6,626 $ 7,115        
Percentage of MSR 1.05% 1.28%        
2.0% Adverse Rate Change            
Constant prepayment rate 30.31% 20.95%        
Discount rate 6.58% 7.94%        
Fair value MSR $ 6,308 $ 6,829        
Percentage of MSR 0.99% 1.22%