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Loans and Allowance for Credit Losses (Narrative) (Details) |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 USD ($) Loan | Jun. 30, 2021 USD ($) Loan | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Accrued interest |  | $ 72,100,000 |  |  |  | $ 67,800,000
Base line economic forecast probability percentage |  | 25.00% |  |  |  |
Unemployment percentage rate forecast |  | 3.50% |  |  |  |
Labor force participation forecast percentage |  | 62.50% |  |  |  |
Prime age employment to population ratio above |  | 80.00% |  |  |  |
Federal funds rate description |  | Federal Funds rate will reach a target of 2.25% or 2.50% by the end of 2022 |  |  |  |
Nonaccrual loans |  | $ 38,066,000 |  |  |  | 55,523,000
TDRs both accruing and nonaccruing |  | 5,700,000 |  |  |  | 10,600,000
Unfunded commitment to borrowers related to modified TDR |  | 0 |  |  |  | 0
Loans held for sale |  | 44,253,000 |  |  |  | 93,069,000
Troubled Debt Restructurings [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Nonaccrual loans |  | 3,200,000 |  |  |  | 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 |  |  | $ 7,100,000 |  |  |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Other modifications |  | $ 100,000 | $ 300,000 |  |  |
Slower Near Term Growth S-2 [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses probability weighting percentage |  | 75.00% |  |  |  |
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] |  |  |  |  |  |
Unemployment percentage rate forecast | 6.50% |  |  |  |  |
Gross domestic product grow percentage |  |  |  | 2.60% | 2.70% |
Residential Mortgages [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Nonaccrual loans |  | $ 20,362,000 |  |  |  | 25,439,000
Loans carried at fair value option |  | 21,500,000 |  |  |  | 41,000,000.0
Unpaid principal balance |  | 21,100,000 |  |  |  | 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 |  | 7,885,000 |  |  |  | 11,887,000
Real estate in process of foreclosure |  | 4,700,000 |  |  |  | 4,400,000
Real estate acquired through foreclosure |  | $ 400,000 |  |  |  | 2,400,000
Consumer [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Number of TDRs subsequently defaulted | Loan |  | 1 |  |  |  |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Nonaccrual loans |  | $ 7,223,000 |  |  |  | 11,895,000
Commercial Non-Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Paycheck protection program loans |  | $ 151,300,000 |  |  |  | 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 |  | 3 |  |  |  |
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 |  | $ 4,829,000 |  |  |  | $ 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% |  |  |  |
Commercial Non-Real Estate and Consumer [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Recorded Investment |  | $ 3,100,000 |  |  |  |

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