Mortgage Servicing Rights - Servicing Income and Expense Included in Mortgage Banking Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing income:
Servicing income	$ 30,763	$ 28,890	$ 22,128
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
Change in fair value of mortgage servicing rights	$ 32,044	$ (3,503)	$ (47,660)
Change in fair value of derivative hedging instruments	(42,143)	(8,614)	13,286
Servicing income	20,664	16,773	(12,246)
Servicing expenses	10,259	9,862	7,890
Net servicing income (loss)	$ 10,405	$ 6,911	$ (20,136)