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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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