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Fair Value of Financial Instruments - Schedule of Assets Measured At Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | ---
Assets: |  |
Securities available for sale, Fair value | $ 543,891 | $ 590,562
Mortgage-backed securities available for sale | 183,029 | 134,523
Securities available for sale | 726,920 | 725,085
Interest rate swaps | 14,968 | 31,881
Total assets | 741,888 | 756,966
Interest Rate Swaps [Member] |  |
Assets: |  |
Interest rate swaps | 14,968 | 31,881
Debt Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 543,891 | 590,562
Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 3,737 | 4,411
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 26,731 | 26,088
Debt Securities [Member] | Asset-backed Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 180,145 | 182,620
Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 207,906 | 226,066
Debt Securities [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 121,597 | 147,594
Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 3,775 | 3,783
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 21,660 | 24,292
Residential Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 70,513 | 102,359
Commercial Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 90,856 | 7,872
Interest Rate Swaps and Caps [Member] |  |
Assets: |  |
Interest rate swaps |  | 31,881
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 542,891 | 589,562
Mortgage-backed securities available for sale | 183,029 | 134,523
Securities available for sale | 725,920 | 724,085
Total assets | 740,888 | 755,966
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member] |  |
Assets: |  |
Interest rate swaps | 14,968 |
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 3,737 | 4,411
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 26,731 | 26,088
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Asset-backed Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 180,145 | 182,620
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 207,906 | 226,066
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 121,597 | 147,594
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 2,775 | 2,783
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 21,660 | 24,292
Significant Other Observable Inputs (Level 2) [Member] | Residential Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 70,513 | 102,359
Significant Other Observable Inputs (Level 2) [Member] | Commercial Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 90,856 | 7,872
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps and Caps [Member] |  |
Assets: |  |
Interest rate swaps |  | 31,881
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 1,000 | 1,000
Securities available for sale | 1,000 | 1,000
Total assets | 1,000 | 1,000
Significant Unobservable Inputs (Level 3) [Member] | Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | $ 1,000 | $ 1,000

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