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Loans - Loan Modification (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 18,399,259 |  | $ 17,154,969
Payment Deferral |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 0 | $ 1,083 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00% |
Combination: Payment Delay and Term Extention |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 35,697 | $ 0 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.20% | 0.00% |
Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 2,100 | $ 0 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00% |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 5,836,877 |  | 5,674,798
Commercial Portfolio Segment [Member] | Payment Deferral |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 0 |  |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% |  |
Commercial Portfolio Segment [Member] | Combination: Payment Delay and Term Extention |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 15,912 |  |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.30% |  |
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 0 |  |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% |  |
Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 7,193,785 |  | $ 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 | $ 1,083 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00% |
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 | $ 19,785 | $ 0 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.30% | 0.00% |
Commercial Real Estate Buildings Land And Other Loans [Member] | Extended Maturity and Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans, net of unearned discounts | $ 2,100 | $ 0 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00% |

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