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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding (Detail) - Non Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Financial institution counterparties Loan/lease interest rate swaps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | $ 821,359 | $ 1,213,519
Estimated Fair Value | 39,336 | 63,001
Financial institution counterparties Loan/lease interest rate swaps liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Liability Notional Amount | 1,100,546 | 663,078
Estimated Fair Value | (21,782) | (9,068)
Financial institution counterparties Loan/lease interest-rate caps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | 196,091 | 205,164
Estimated Fair Value | 4,563 | 7,053
Customer counterparties Loan/lease interest rate swaps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | 1,100,546 | 663,078
Estimated Fair Value | 21,783 | 9,068
Customer counterparties Loan/lease interest rate swaps liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Liability Notional Amount | 821,359 | 1,213,519
Estimated Fair Value | (39,336) | (63,000)
Customer counterparties Loan/lease interest rate caps liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Liability Notional Amount | 196,091 | 205,164
Estimated Fair Value | $ (4,564) | $ (7,054)

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