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Loans and Allowance for Credit Losses (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) Loan | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |
Accrued interest | $ 125,400,000 |  | $ 124,700,000
Percentage of baseline economic forecast | 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 | $ 82,082,000 |  | 59,036,000
Loans held for sale | 16,470,000 |  | 26,124,000
Modified Loans To Borrowers Experiencing Financial Difficulty [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 200,000 |  | 100,000
Accruing and nonaccruing | 37,600,000 |  | 24,500,000
Unfunded commitment to borrowers related to MEFD or TDR | $ 10,800,000 |  | 700,000
Moderate Recessionary Scenario S-3 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Percentage of baseline economic forecast |  | 10.00% |
Downside Mild Recessionary S-2 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Percentage of baseline economic forecast | 60.00% | 50.00% |
Residential Mortgages [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | $ 25,924,000 |  | 26,137,000
Loans carried at fair value option | 15,200,000 |  | 13,300,000
Unpaid principal balance | 14,800,000 |  | 12,900,000
Consumer [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 10,180,000 |  | 8,555,000
Real estate in process of foreclosure | 6,100,000 |  | 7,100,000
Real estate acquired through foreclosure | 800,000 |  | 1,600,000
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | $ 19,684,000 |  | 23,068,000
Commercial Non-Real Estate [Member] | Consumer [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of contracts subsequently defaulted | Loan | 3 |  |
Recorded Investment | $ 3,200,000 | $ 0 |
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | $ 17,487,000 |  | $ 20,840,000

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