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Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Accrued interest |  | $ 70,500 |  |  |  |  | $ 76,200
Weighted average percentage of forecast |  | 50.00% |  |  |  |  |
Build back better infrastructure and social legislation package forecasted amount |  | $ 2,500,000,000 |  |  |  |  |
Nonaccrual loans |  | 60,357 |  |  |  |  | 139,879
TDRs both accruing and nonaccruing |  | 10,300 |  |  |  |  | 25,800
Unfunded commitment to borrowers related to modified TDR |  | 0 |  |  |  |  | 4,600
Troubled Debt Restructurings [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Nonaccrual loans |  | 7,200 |  |  |  |  | 21,600
Reduced interest rate |  |  | $ 1,100 |  |  |  |
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Extended terms and other payment concessions |  | 7,100 | 700 |  |  |  |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Other modifications |  | $ 500 | 2,100 |  |  |  |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Covenant waivers |  |  | $ 400 |  |  |  |
Downside Scenario S-2 [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Weighted average percentage of forecast |  | 50.00% |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Unemployment percentage rate forecast | 4.50% |  |  | 3.50% | 3.60% | 5.50% |
Gross domestic product weighted average |  |  |  | 2.30% | 4.30% | 6.00% |
Federal reserve rate |  |  |  | 0.00% |  |  |
Residential Mortgages [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Nonaccrual loans |  | $ 25,964 |  |  |  |  | 40,573
Residential Mortgages [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Number of TDRs subsequently defaulted | loan |  | 1 | 1 |  |  |  |
Recorded Investment |  | $ 600 | $ 600 |  |  |  |
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Number of TDRs subsequently defaulted | loan |  |  | 1 |  |  |  |
Recorded Investment |  |  | $ 400 |  |  |  |
Consumer [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Nonaccrual loans |  | 12,238 |  |  |  |  | 23,385
Real estate in process of foreclosure |  | 6,100 |  |  |  |  | 17,200
Real estate acquired through foreclosure |  | 4,000 |  |  |  |  | 3,400
Consumer [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Number of TDRs subsequently defaulted | loan |  |  | 2 |  |  |  |
Recorded Investment |  |  | $ 200 |  |  |  |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Nonaccrual loans |  | 16,668 |  |  |  |  | 66,692
Commercial Non-Real Estate [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Paycheck protection program loans |  | $ 935,300 |  |  |  |  | 2,000,000
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Loans interest bearing rate |  | 1.00% |  |  |  |  |
Loans receivable percentage of origination fee description |  | These loans also earn an origination fee of 1%, 3%, or 5%, depending on the loan size |  |  |  |  |
Nonaccrual loans |  | $ 9,948 |  |  |  |  | $ 52,836
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Minimum [Member] | Total Commercial [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Loans term |  | 2 years |  |  |  |  |
Loans percentage of origination fee |  | 1.00% |  |  |  |  |
Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] | Maximum [Member] | Total Commercial [Member] |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |
Loans term |  | 5 years |  |  |  |  |
Loans percentage of origination fee |  | 5.00% |  |  |  |  |

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