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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest rate swaps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | $ 0 | $ 1,614
Estimated Fair Value | 0 | 19
Non Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest rate swaps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | 1,339,716 | 1,165,812
Estimated Fair Value | 95,361 | 70,416
Non Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest rate swaps liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Liability Notional Amount | 60,450 | 78,798
Estimated Fair Value | (674) | (1,102)
Non Designated as Hedging Instrument [Member] | Financial institution counterparties Loan/lease interest-rate caps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | 226,507 | 246,442
Estimated Fair Value | 14,062 | 15,256
Non Designated as Hedging Instrument [Member] | Customer counterparties Loan/lease interest rate swaps assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Assets Notional Amount | 60,450 | 53,570
Estimated Fair Value | 674 | 1,102
Non Designated as Hedging Instrument [Member] | Customer counterparties Loan/lease interest rate swaps liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Liability Notional Amount | 1,339,716 | 1,175,563
Estimated Fair Value | (95,361) | (79,175)
Non Designated as Hedging Instrument [Member] | Customer counterparties Loan/lease interest rate caps liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Forward Contracts – Liability Notional Amount | 226,507 | 246,442
Estimated Fair Value | $ (14,062) | $ (15,256)

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