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Derivative Financial Instruments (Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding) (Detail) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | $ 1,213,519 | $ 1,040,659
Estimated Fair Value | 63,001 | 58,486
Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 663,078 | 617,266
Estimated Fair Value | (9,068) | (20,293)
Financial Institution Counterparties Loan Lease Interest Rate Caps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 205,164 | 275,000
Estimated Fair Value | 7,053 | 11,747
Customer Counterparties Loan Lease Interest Rate Swaps Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 663,078 | 617,266
Estimated Fair Value | 9,068 | 20,482
Customer Counterparties Loan Lease Interest Rate Swaps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 1,213,519 | 1,040,659
Estimated Fair Value | (63,000) | (58,485)
Customer Counterparties Loan Lease Interest Rate Caps Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 205,164 | 275,000
Estimated Fair Value | $ (7,054) | $ (11,747)

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