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Loans and Allowance for Credit Losses (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) Loan | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Loan | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Accrued interest | $ 121,600,000 |  | $ 121,600,000 |  | $ 124,700,000
Percentage of baseline economic forecast | 40.00% | 40.00% | 40.00% | 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 | $ 86,253,000 |  | $ 86,253,000 |  | 59,036,000
Recorded Investment |  | $ 0 |  | $ 0 |
Loans held for sale | 27,354,000 |  | 27,354,000 |  | 26,124,000
Modified Loans To Borrowers Experiencing Financial Difficulty [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 5,300,000 |  | 5,300,000 |  | 100,000
Accruing and nonaccruing | 62,700,000 |  | 62,700,000 |  | 24,500,000
Unfunded commitment to borrowers related to MEFD or TDR | $ 7,200,000 |  | $ 7,200,000 |  | 700,000
Downside Mild Recessionary S-2 [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Percentage of baseline economic forecast | 60.00% | 60.00% | 60.00% | 60.00% |
Residential Mortgages [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 28,293,000 |  | $ 28,293,000 |  | 26,137,000
Number of contracts subsequently defaulted | Loan | 1 |  | 1 |  |
Recorded Investment | $ 100,000 |  | $ 100,000 |  |
Loans carried at fair value option | 26,100,000 |  | 26,100,000 |  | 13,300,000
Unpaid principal balance | 25,400,000 |  | 25,400,000 |  | 12,900,000
Consumer [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 9,972,000 |  | 9,972,000 |  | 8,555,000
Real estate in process of foreclosure | 5,200,000 |  | 5,200,000 |  | 7,100,000
Real estate acquired through foreclosure | 1,600,000 |  | 1,600,000 |  | 1,600,000
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 22,611,000 |  | $ 22,611,000 |  | 23,068,000
Commercial Non-Real Estate [Member] | Consumer [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Number of contracts subsequently defaulted | Loan | 1 |  | 4 |  |
Recorded Investment | $ 6,300,000 |  | $ 9,600,000 |  |
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 17,951,000 |  | $ 17,951,000 |  | $ 20,840,000

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