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Mortgage Servicing Rights - Narrative (Details) - Mortgage loans - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]        
Mortgage servicing rights, fair value $ 34,800,000 $ 42,400,000    
Servicing asset at fair value, assumptions used to estimate fair value, weighted average life 6 years 8 years    
Impairment reversals $ 0      
Permanent impairment charged against carrying value $ 0   $ 0 $ 0
Minimum        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]        
Servicing assets at fair value, assumptions used to estimate fair value, discount rate 9.30% 10.40%    
Servicing assets at fair value, assumptions used to estimate fair value, prepayment speed 0.60% 0.40%    
Maximum [Member]        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]        
Servicing assets at fair value, assumptions used to estimate fair value, discount rate 11.00% 12.10%    
Servicing assets at fair value, assumptions used to estimate fair value, prepayment speed 1.50% 1.50%