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Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset Notional	$ 300,000		$ 1,000,000
Other Assets [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	38	$ 112
Other Assets [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	38	112
Derivative Asset Notional	390,307	394,359
Derivative Liability Notional	390,307	394,359
Other Assets [Member] \| Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	11,682	0
Other Assets [Member] \| Fair Value Hedges [Member] \| Derivatives designated as hedging instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	10,893	0
Derivative Asset Notional	1,000,000	1,000,000
Other Assets [Member] \| Cash Flow Hedges [Member] \| Derivatives designated as hedging instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	789
Other Liabilities [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	38	112
Other Liabilities [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	38	112
Other Liabilities [Member] \| Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	6,938
Other Liabilities [Member] \| Fair Value Hedges [Member] \| Derivatives designated as hedging instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0
Other Liabilities [Member] \| Cash Flow Hedges [Member] \| Derivatives designated as hedging instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Notional	300,000
Liability Derivatives	$ 0	$ 6,938