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Servicing Rights - Key Assumptions and the Sensitivity of the Fair Value (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]            
Aggregate portfolio principal balance $ 598,415 $ 557,583        
Base            
Mortgage servicing rights $ 10,836 $ 10,821        
MSR as a percentage of serviced loans 1.81% 1.94%        
Mortgage servicing rights            
Servicing Assets at Fair Value [Line Items]            
Aggregate portfolio principal balance $ 598,415 $ 557,583        
Weighted average rate of note 3.96% 3.91%        
Base            
Constant prepayment rate 9.75% 7.70%        
Discount rate 9.60% 9.94%        
Mortgage servicing rights $ 10,836 $ 10,821 $ 11,254 $ 8,733 $ 8,039 $ 7,305
MSR as a percentage of serviced loans 1.81% 1.94%        
1.0% Adverse Rate Change            
Constant prepayment rate 23.69% 19.35%        
Discount rate 8.60% 8.94%        
Fair value MSR $ 6,828 $ 7,115        
Percentage of MSR 1.14% 1.28%        
2.0% Adverse Rate Change            
Constant prepayment rate 25.40% 20.95%        
Discount rate 7.60% 7.94%        
Fair value MSR $ 6,536 $ 6,829        
Percentage of MSR 1.09% 1.22%