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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 |

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