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Commitments and Contingencies (Guarantees Outstanding) (Details) - Loans Sold or Securitized With Recourse - Loans Sold or Securitized with Recourse - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Single Family Residential    
Guarantees    
Maximum Potential Future Payments $ 11,857 $ 12,578
Carrying Value 11,857 12,578
Multifamily Residential    
Guarantees    
Maximum Potential Future Payments 15,885 15,892
Carrying Value 34,771 40,708
Single Family and Multi-family Residential Loans    
Guarantees    
Maximum Potential Future Payments 27,742 28,470
Carrying Value $ 46,628 $ 53,286