Mortgage Servicing Rights Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Servicing Assets at Amortized Value [Line Items]
Loans serviced by unrelated third party	$ 4,200,000,000	$ 4,300,000,000
Estimated fair value of MSRs	50,000,000	35,400,000
Non-interest income before investment securities gains	227,157,000	240,229,000	$ 226,335,000
Mortgage banking
Servicing Assets at Amortized Value [Line Items]
Non-interest income before investment securities gains	14,204,000	33,576,000	42,309,000
Residential mortgage
Servicing Assets at Amortized Value [Line Items]
Estimated fair value of MSRs	50,044,000	35,393,000	28,245,000
Increase to valuation allowance	0	600,000	10,500,000	$ 0
Amortization expense	5,843,000	11,968,000	12,695,000
Residential mortgage | Mortgage banking
Servicing Assets at Amortized Value [Line Items]
Non-interest income before investment securities gains	$ 10,600,000	$ 11,200,000	$ 11,900,000