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Loans (Modified Loans by Type of Modification) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | $ 18,824,251 | $ 17,154,969 |
Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 | 1,051 |
Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 33,251 | 0 |
Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 2,092 | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 | 1,051 | $ 2,189
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 33,251 | 0 | 1,556
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 | 0 | 0
Charge-offs | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 371 | 4,278
Charge-offs | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 352 | 0
Charge-offs | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 0 | 0
Proceeds from sales | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 0 |
Proceeds from sales | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 1,070 |
Proceeds from sales | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 0 |
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 5,959,133 | 5,674,798 |
Commercial Portfolio Segment [Member] | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  |
Commercial Portfolio Segment [Member] | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 13,813 |  |
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  |
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 1,162
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 13,813 |  | 0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial Real Estate, Buildings, Land and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 7,301,920 | 6,706,078 |
Commercial Real Estate, Buildings, Land and Other [Member] | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 | 1,051 |
Commercial Real Estate, Buildings, Land and Other [Member] | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 19,438 | 0 |
Commercial Real Estate, Buildings, Land and Other [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 2,092 | 0 |
Commercial Real Estate, Buildings, Land and Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 | 1,051 | 306
Commercial Real Estate, Buildings, Land and Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 19,438 | 0 | 1,556
Commercial Real Estate, Buildings, Land and Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | 0 | 0 | 0
Commercial Real Estate, Buildings, Land and Other [Member] | Charge-offs | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 371 |
Commercial Real Estate, Buildings, Land and Other [Member] | Charge-offs | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 352 |
Commercial Real Estate, Buildings, Land and Other [Member] | Charge-offs | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 0 |
Commercial Real Estate, Buildings, Land and Other [Member] | Proceeds from sales | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 0 |
Commercial Real Estate, Buildings, Land and Other [Member] | Proceeds from sales | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 1,070 |
Commercial Real Estate, Buildings, Land and Other [Member] | Proceeds from sales | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  | 0 |
Commercial and Industrial Total Energy Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts | $ 935,265 | $ 925,729 |
Commercial and Industrial Total Energy Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  |  | 721
Commercial and Industrial Total Energy Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  |  | 0
Commercial and Industrial Total Energy Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  |  | 0
Commercial and Industrial Total Energy Loans [Member] | Charge-offs | Payment Deferral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  |  | 4,278
Commercial and Industrial Total Energy Loans [Member] | Charge-offs | Combination: Payment Delay and Term Extention |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  |  | 0
Commercial and Industrial Total Energy Loans [Member] | Charge-offs | Extended Maturity and Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned discounts |  |  | $ 0

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