Commitments and Contingencies - Guarantees Outstanding (Details) - Loans Sold or Securitized With Recourse - Loans Sold or Securitized with Recourse - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Guarantor obligation, maximum potential future payment [Abstract]
Expire in One Year or Less	$ 28
Expire After One Year Through Three Years	23
Expire After Three Years Through Five Years	94
Expire After Five Years	20,943
Total	21,088	$ 21,777
Carrying Value	25,979	28,101
Single Family Residential
Guarantor obligation, maximum potential future payment [Abstract]
Expire in One Year or Less	28
Expire After One Year Through Three Years	23
Expire After Three Years Through Five Years	28
Expire After Five Years	6,013
Total	6,092	6,781
Carrying Value	6,092	6,781
Multifamily residential
Guarantor obligation, maximum potential future payment [Abstract]
Expire in One Year or Less	0
Expire After One Year Through Three Years	0
Expire After Three Years Through Five Years	66
Expire After Five Years	14,930
Total	14,996	14,996
Carrying Value	$ 19,887	$ 21,320