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Fair Value - Level 3 Unobservable Inputs, Mortgage Servicing Liabilities (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Carrying value $ 8,681,000 $ 14,120,000
Mortgage servicing liabilities | Level 3    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Carrying value 8,681,000 14,120,000
Unpaid principal balance of underlying mortgage loans $ 1,160,938,000 $ 1,620,609,000
Weighted-average note interest rate (as a percent) 0.25 0.25
Annual per-loan cost of servicing $ 373 $ 404
Mortgage servicing liabilities | Pricing spread | Level 3    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Input | item 7.3 7.7
Mortgage servicing liabilities | Annual total prepayment speed | Level 3    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Input | item 32.2 32.9
Mortgage servicing liabilities | Life | Level 3    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Input | item 3.8 3.5