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Fair Value of Financial Instruments - Schedule of Assets Measured At Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019
--- | --- | ---
Assets: |  |
Securities available for sale, Fair value | $ 666,377 | $ 544,333
Mortgage-backed securities available for sale | 565,314 | 169,930
Securities available for sale | 1,231,691 | 714,263
Interest rate swaps and caps | 2,430 | 3,856
Total assets | 1,234,121 | 718,119
Liabilities: |  |
Interest rate swaps, liabilities | 369 | 140
Total liabilities | 369 | 140
Interest Rate Swaps and Caps [Member] |  |
Assets: |  |
Interest rate swaps and caps | 2,430 |
Interest Rate Swaps [Member] |  |
Assets: |  |
Interest rate swaps and caps | 1,012 | 3,856
Liabilities: |  |
Interest rate swaps, liabilities | 369 | 140
Debt Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 666,377 | 544,333
Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 694 | 3,678
Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 91,050 | 26,951
Debt Securities [Member] | Asset-backed Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 181,068 | 179,313
Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 198,549 | 208,611
Debt Securities [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 191,241 | 122,024
Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 3,775 | 3,756
Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 63,594 | 21,390
Residential Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 202,858 | 44,303
Commercial Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 298,862 | 104,237
Interest Rate Swaps [Member] |  |
Assets: |  |
Interest rate swaps and caps |  | 3,856
Liabilities: |  |
Interest rate swaps, liabilities |  | 140
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 665,377 | 543,333
Mortgage-backed securities available for sale | 565,314 | 169,930
Securities available for sale | 1,230,691 | 713,263
Total assets | 1,233,121 | 717,119
Liabilities: |  |
Total liabilities | 369 | 140
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps and Caps [Member] |  |
Assets: |  |
Interest rate swaps and caps | 2,430 |
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member] |  |
Liabilities: |  |
Interest rate swaps, liabilities | 369 |
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | U.S. Agency Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 694 | 3,678
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Obligations of State and Political Subdivisions [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 91,050 | 26,951
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Asset-backed Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 181,068 | 179,313
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Collateralized Loan Obligations [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 198,549 | 208,611
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 191,241 | 122,024
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] | Trust Preferred Securities [Member] |  |
Assets: |  |
Securities available for sale, Fair value | 2,775 | 2,756
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Mortgage Obligations Excluding Pass Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 63,594 | 21,390
Significant Other Observable Inputs (Level 2) [Member] | Residential Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 202,858 | 44,303
Significant Other Observable Inputs (Level 2) [Member] | Commercial Pass-Through Securities [Member] |  |
Assets: |  |
Mortgage-backed securities available for sale | 298,862 | 104,237
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member] |  |
Assets: |  |
Interest rate swaps and caps |  | 3,856
Liabilities: |  |
Interest rate swaps, liabilities |  | 140
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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