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Loans (Modification to Borrowers Experiencing Financial Difficulty) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 18,824,251 | $ 17,154,969
Payment Deferral |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 0 | $ 1,051
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 | $ 33,251 | $ 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 | $ 2,092 | $ 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 | $ 5,959,133 | $ 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 | $ 13,813 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.20% |
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 [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 7,301,920 | 6,706,078
Commercial Real Estate, Buildings, Land and Other [Member] | Payment Deferral |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 0 | $ 1,051
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00%
Commercial Real Estate, Buildings, Land and Other [Member] | Combination: Payment Delay and Term Extention |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 19,438 | $ 0
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.30% | 0.00%
Commercial Real Estate, Buildings, Land and Other [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 2,092 | $ 0
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00%

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