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Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset Notional			$ 1,000,000
Other Assets [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 364	$ 112
Other Assets [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	364	112
Derivative Asset Notional	381,468	394,359
Other Assets [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Other Assets [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Derivative Asset Notional	1,000,000	1,000,000
Other Assets [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0
Other Liabilities [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	364	112
Other Liabilities [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	364	112
Derivative Liability, Notional Amount	381,468	394,359
Other Liabilities [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	20,288	6,938
Other Liabilities [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	14,959	$ 6,938
Other Liabilities [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	5,329
Derivative Liability, Notional Amount	$ 300,000