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Loans and Allowance for Credit Losses (Narrative) (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) Loan | Mar. 31, 2021 USD ($) Loan | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Accrued interest | $ 69,300,000 |  |  |  | $ 67,800,000
Base line economic forecast probability percentage | 40.00% |  |  |  |
Social and climate package passed by legislature | $ 600,000,000,000 |  |  |  |
Federal reserve interest rate description | four 25-basis point |  |  |  |
Nonaccrual loans | $ 42,439,000 |  |  |  | 55,523,000
TDRs both accruing and nonaccruing | 6,500,000 |  |  |  | 10,600,000
Unfunded commitment to borrowers related to modified TDR | 0 |  |  |  | 0
Loans held for sale | 59,877,000 |  |  |  | 93,069,000
Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 3,600,000 |  |  |  | 6,800,000
Reduced interest rate | 100,000 |  |  |  |
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 |  | $ 1,900,000 |  |  |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Other modifications | $ 100,000 | $ 5,300,000 |  |  |
Slower Near Term Growth S-2 [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Allowance for credit losses probability weighting percentage | 60.00% |  |  |  |
Downside Scenario S-1 [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Weighted average percentage of forecast |  | 65.00% |  |  |
Downside Scenario S-2 [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Weighted average percentage of forecast |  | 35.00% |  |  |
Forecast [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Gross domestic product grow percentage |  |  | 3.50% | 3.00% |
Residential Mortgages [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 22,744,000 |  |  |  | 25,439,000
Loans carried at fair value option | 25,000,000.0 |  |  |  | 41,000,000.0
Unpaid principal balance | 25,100,000 |  |  |  | 40,100,000
Residential Mortgages [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Number of TDRs subsequently defaulted | Loan |  | 1 |  |  |
Recorded Investment |  | $ 600,000 |  |  |
Consumer [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 9,094,000 |  |  |  | 11,887,000
Real estate in process of foreclosure | 5,600,000 |  |  |  | 4,400,000
Real estate acquired through foreclosure | 2,400,000 |  |  |  | 2,400,000
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 8,061,000 |  |  |  | 11,895,000
Commercial Non-Real Estate [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Paycheck protection program loans | $ 334,800,000 |  |  |  | 531,100,000
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Number of TDRs subsequently defaulted | Loan | 2 |  |  |  |
Recorded Investment | $ 3,100,000 |  |  |  |
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 | $ 5,312,000 |  |  |  | $ 6,974,000
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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