Mortgage Servicing Rights and Mortgage Servicing Liabilities - Mortgage Servicing Liabilities Carried at FV (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amortized cost:
Mortgage servicing liabilities resulting from loan sales		$ 106,631	$ 23,325
Mortgage servicing liabilities
Amortized cost:
Balance at beginning of year	$ 2,816	45,324	29,140
Mortgage servicing liabilities resulting from loan sales		106,631	23,325
Changes in valuation inputs used in valuation model	(347)	(68,020)	31,757
Other changes in fair value	(373)	(81,119)	(38,898)
Total change in fair value	(720)	(149,139)	(7,141)
Balance at end of year	2,096	2,816	45,324
UPB of underlying loan at end of period	$ 33,157	$ 60,593	$ 2,857,492