Fair Values of Assets and Liabilities - Schedule of Changes In Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Mortgage loans held-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 29,406	$ 88,963	$ 48,655	$ 0
Net income	626	(787)	1,494	(3,687)
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(18,454)	(27,512)	(61,046)	(27,512)
Net transfers (out of)/into Level 3	13,609	(12,244)	36,084	79,619
Ending balance	25,187	48,420	25,187	48,420
Loans held-for- investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	61,123	84,798	84,165	15,891
Net income	(260)	(1,574)	(515)	(4,121)
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(16,852)	(12,986)	(53,767)	(21,884)
Net transfers (out of)/into Level 3	13,950	28,329	28,078	108,681
Ending balance	57,961	98,567	57,961	98,567
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	200,692	212,664	230,225	147,571
Net income	9,832	17,007	10,469	82,100
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales		0	(30,170)	0
Settlements	0	0	0	0
Net transfers (out of)/into Level 3	0	0	0	0
Ending balance	210,524	229,671	210,524	229,671
Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,487	6,649	1,711	10,560
Net income	(971)	(6,508)	805	(10,419)
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Net transfers (out of)/into Level 3	0	0	0	0
Ending balance	2,516	141	2,516	141
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	114,155	113,485	117,537	105,687
Net income	0	0	0	0
Other comprehensive income or loss	(1,614)	(2,618)	(6,437)	(8,752)
Purchases	678	11,590	12,074	28,333
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	(25)	(9,955)	(2,836)
Net transfers (out of)/into Level 3	0	0	0	0
Ending balance	$ 113,219	$ 122,432	$ 113,219	$ 122,432