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Loans (Modification to Borrowers Experiencing Financial Difficulty) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 20,754,813 | $ 18,824,251
Payment Deferral |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 8,138 | $ 0
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 | $ 45,835 | $ 33,251
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.20% | 0.20%
Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 31,302 | $ 2,092
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.20% | 0.00%
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 6,109,532 | $ 5,967,182
Commercial Portfolio Segment [Member] | Payment Deferral |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 6,126 | $ 0
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.10% | 0.00%
Commercial Portfolio Segment [Member] | Combination: Payment Delay and Term Extention |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 45,835 | $ 13,813
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.80% | 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 | $ 0
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.00%
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 7,704,447 | $ 7,301,920
Commercial Real Estate, Buildings, Land and Other [Member] | Payment Deferral |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans, net of unearned discounts | $ 2,012 | $ 0
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 | $ 0 | $ 19,438
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% | 0.30%
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 | $ 31,302 | $ 2,092
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.40% | 0.00%

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