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Loans - Financing Receivables, Modified Loans Past Due in Excess of 90 Days or on Non-Accrual Status at Period-End (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 17,746,311 | $ 17,154,969 |
Payment Deferral |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | $ 1,116
Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 1,116
Combination: Payment Delay and Term Extention |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 36,486 |  | 0
Combination: Payment Delay and Term Extention | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 36,486 |  | 0
Extended Maturity | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 6,924,896 | 6,706,078 |
Commercial Real Estate Buildings Land And Other Loans [Member] | Payment Deferral |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 1,116
Commercial Real Estate Buildings Land And Other Loans [Member] | Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 1,116
Commercial Real Estate Buildings Land And Other Loans [Member] | Payment Deferral | Charge-offs |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 371
Commercial Real Estate Buildings Land And Other Loans [Member] | Payment Deferral | Proceeds from sales |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial Real Estate Buildings Land And Other Loans [Member] | Combination: Payment Delay and Term Extention |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 20,466 |  | 0
Commercial Real Estate Buildings Land And Other Loans [Member] | Combination: Payment Delay and Term Extention | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 20,466 |  | 0
Commercial Real Estate Buildings Land And Other Loans [Member] | Combination: Payment Delay and Term Extention | Charge-offs |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 352
Commercial Real Estate Buildings Land And Other Loans [Member] | Combination: Payment Delay and Term Extention | Proceeds from sales |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 1,070
Commercial Real Estate Buildings Land And Other Loans [Member] | Extended Maturity | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial Real Estate Buildings Land And Other Loans [Member] | Extended Maturity | Charge-offs |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial Real Estate Buildings Land And Other Loans [Member] | Extended Maturity | Proceeds from sales |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial and Industrial Total Energy Loans [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 986,571 | 925,729 |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 5,726,804 | $ 5,674,798 |
Commercial Portfolio Segment [Member] | Payment Deferral |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  |
Commercial Portfolio Segment [Member] | Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 0 |  | 0
Commercial Portfolio Segment [Member] | Combination: Payment Delay and Term Extention |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 16,020 |  |
Commercial Portfolio Segment [Member] | Combination: Payment Delay and Term Extention | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | 16,020 |  | 0
Commercial Portfolio Segment [Member] | Extended Maturity | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 0 |  | $ 0

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