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Fair Value of Financial Instruments - Schedule of Assets Measured At Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Jun. 30, 2022
Assets:
Fair Value	$ 1,286,354	$ 1,344,093
Interest rate contracts	63,617	41,223
Assets, fair value	1,349,971	1,385,316
Liabilities:
Interest rate contracts	2,500
Total liabilities	2,500
Debt securities:
Assets:
Fair Value	687,637	656,202
Obligations of state and political subdivisions
Assets:
Fair Value		28,435
Asset-backed securities
Assets:
Fair Value	158,623	166,557
Collateralized loan obligations
Assets:
Fair Value	384,059	307,813
Corporate bonds
Assets:
Fair Value	144,955	153,397
Mortgage-backed securities:
Assets:
Fair Value	598,717	687,891
Collateralized mortgage obligations
Assets:
Fair Value		7,122
Residential pass-through securities
Assets:
Fair Value	450,156	514,758
Commercial pass-through securities
Assets:
Fair Value	148,561	166,011
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Fair Value	0	0
Interest rate contracts	0	0
Assets, fair value	0	0
Liabilities:
Interest rate contracts	0
Total liabilities	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt securities:
Assets:
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of state and political subdivisions
Assets:
Fair Value		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Assets:
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations
Assets:
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Assets:
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities:
Assets:
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized mortgage obligations
Assets:
Fair Value		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential pass-through securities
Assets:
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial pass-through securities
Assets:
Fair Value	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Fair Value	1,286,354	1,344,093
Interest rate contracts	63,617	41,223
Assets, fair value	1,349,971	1,385,316
Liabilities:
Interest rate contracts	2,500
Total liabilities	2,500
Significant Other Observable Inputs (Level 2) | Debt securities:
Assets:
Fair Value	687,637	656,202
Significant Other Observable Inputs (Level 2) | Obligations of state and political subdivisions
Assets:
Fair Value		28,435
Significant Other Observable Inputs (Level 2) | Asset-backed securities
Assets:
Fair Value	158,623	166,557
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations
Assets:
Fair Value	384,059	307,813
Significant Other Observable Inputs (Level 2) | Corporate bonds
Assets:
Fair Value	144,955	153,397
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities:
Assets:
Fair Value	598,717	687,891
Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations
Assets:
Fair Value		7,122
Significant Other Observable Inputs (Level 2) | Residential pass-through securities
Assets:
Fair Value	450,156	514,758
Significant Other Observable Inputs (Level 2) | Commercial pass-through securities
Assets:
Fair Value	148,561	166,011
Significant Unobservable Inputs (Level 3)
Assets:
Fair Value	0	0
Interest rate contracts	0	0
Assets, fair value	0	0
Liabilities:
Interest rate contracts	0
Total liabilities	0
Significant Unobservable Inputs (Level 3) | Debt securities:
Assets:
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Obligations of state and political subdivisions
Assets:
Fair Value		0
Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets:
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations
Assets:
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Corporate bonds
Assets:
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities:
Assets:
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Collateralized mortgage obligations
Assets:
Fair Value		0
Significant Unobservable Inputs (Level 3) | Residential pass-through securities
Assets:
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Commercial pass-through securities
Assets:
Fair Value	0	0
Interest Rate Contract
Assets:
Interest rate contracts	63,617	41,223
Liabilities:
Interest rate contracts	2,500
Interest Rate Contract | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate contracts	0	0
Liabilities:
Interest rate contracts	0
Interest Rate Contract | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate contracts	63,617	41,223
Liabilities:
Interest rate contracts	2,500
Interest Rate Contract | Significant Unobservable Inputs (Level 3)
Assets:
Interest rate contracts	0	$ 0
Liabilities:
Interest rate contracts	$ 0

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