Mortgage Servicing Rights - Servicing Income and Expense Included in Mortgage Banking Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Servicing income:
Servicing income	$ 7,586	$ 7,966	$ 15,354	$ 15,395
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income, Other expense	Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income, Other expense	Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income, Other expense	Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income, Other expense
Change in fair value of mortgage servicing rights	$ (719)	$ 8,745	$ (5,993)	$ 28,096
Change in fair value of derivative hedging instruments	(3,503)	(9,897)	(1,636)	(28,995)
Servicing income	3,364	6,814	7,725	14,496
Servicing expenses	2,331	3,377	4,214	5,925
Net servicing income (loss)	$ 1,033	$ 3,437	$ 3,511	$ 8,571