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Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Loan | Sep. 30, 2024 USD ($) Loan | Sep. 30, 2025 USD ($) Loan | Sep. 30, 2024 USD ($) Loan | Dec. 31, 2024 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Accrued interest | $ 107,600 |  | $ 107,600 |  | $ 109,800
Percentage of baseline economic forecast | 50.00% | 40.00% | 50.00% | 40.00% |
Description of post modification defaults |  |  | A payment default occurs if the loan is either 90 days or more delinquent or has been charged off as of the end of the period presented. |  |
Nonaccrual loans | $ 113,554 |  | $ 113,554 |  | 97,335
Loans held for sale | 33,161 |  | 33,161 |  | 21,525
Modified Loans To Borrowers Experiencing Financial Difficulty [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 9,300 |  | 9,300 |  | 20,200
Accruing and nonaccruing | 91,500 |  | 91,500 |  | 99,500
Unfunded exposure to borrowers related to MEFD or TDR | $ 4,700 |  | $ 4,700 |  | 6,900
Downside Mild Recessionary S-2 [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Percentage of baseline economic forecast | 50.00% | 60.00% | 50.00% | 60.00% |
Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Number of contracts subsequently defaulted | Loan | 2 | 3 | 7 | 6 |
Recorded Investment | $ 3,300 | $ 3,600 | $ 27,600 | $ 13,200 |
Residential Mortgages [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 41,026 |  | 41,026 |  | 44,086
Number of contracts subsequently defaulted | Loan |  | 2 |  | 3 |
Recorded Investment |  | $ 300 |  | $ 400 |
Loans carried at fair value option | 33,200 |  | 33,200 |  | 18,900
Unpaid principal balance | 32,300 |  | 32,300 |  | 18,600
Consumer [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 10,265 |  | $ 10,265 |  | 11,187
Number of contracts subsequently defaulted | Loan | 1 | 1 | 2 | 1 |
Recorded Investment | $ 100 | $ 200 | $ 200 | $ 200 |
Real estate in process of foreclosure | 13,000 |  | 13,000 |  | 10,500
Real estate acquired through foreclosure | $ 3,700 |  | $ 3,700 |  | 2,000
Weighted Average [Member] | Total Commercial [Member] | Term Extension [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Reportable modification period | 7 months | 9 months | 11 months | 9 months |
Weighted Average [Member] | Total Commercial [Member] | Other Than Insignificant Payment Delays [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Reportable modification period |  | 3 months | 4 months | 3 months |
Weighted Average [Member] | Residential Mortgages [Member] | Term Extension [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Reportable modification period | 3 years | 2 years | 18 months | 5 years |
Weighted Average [Member] | Residential Mortgages [Member] | Other Than Insignificant Payment Delays [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Reportable modification period | 1 year |  | 10 months |  |
Weighted Average [Member] | Consumer [Member] | Term Extension [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Reportable modification period | 3 years |  | 31 months | 4 years |
Weighted Average [Member] | Consumer [Member] | Other Than Insignificant Payment Delays [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Reportable modification period | 7 months |  | 7 months |  |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 54,200 |  | $ 54,200 |  | 36,145
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 47,192 |  | 47,192 |  | 33,418
Commercial Real Estate - Owner Occupied [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 7,008 |  | $ 7,008 |  | $ 2,727

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