Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Days past due for nonaccrual status	90 days
Change in retained earnings	$ 1,619,300	$ 1,450,758
Change in ACL for certain OBS credit exposure	$ 2,700	6,000
Financing receivable, obtaining certified third-party appraisal for impaired loans, period	12 months
Extension term of leases	5 years
Business Combinations [Abstract]
Foreign currency open position	$ 500
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	50 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	8 years
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Consumer Loan
Property, Plant and Equipment [Line Items]
Number of days closed end consumer loans are charged off when they become past due	120 days
Number of days open end consumer loans are charged off when they become past due	180 days
Residential mortgage
Property, Plant and Equipment [Line Items]
Change in ACL for certain OBS credit exposure	$ 1,800	$ 1,400
Employee Equity Plan
Business Combinations [Abstract]
Award vesting period	3 years
Directors' Plan
Business Combinations [Abstract]
Award vesting period	1 year
Minimum
Property, Plant and Equipment [Line Items]
Remaining lease term of operating leases	1 year
Maximum
Property, Plant and Equipment [Line Items]
Remaining lease term of operating leases	20 years