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Fair Value of Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 726,920 | $ 725,085
Investment securities held to maturity, amortized cost | 592,199 | 589,730
Investment securities held to maturity | 592,814 | 579,499
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 725,920 | 724,085
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 1,000 | 1,000
Carrying Amount [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 54,160 | 128,864
Investment securities available for sale | 726,920 | 725,085
Investment securities held to maturity, amortized cost | 592,199 | 589,730
Loans held-for-sale | 997 | 863
Net loans receivable | 4,626,699 | 4,470,483
FHLB Stock | 64,288 | 59,004
Interest receivable | 20,326 | 18,510
Interest rate swaps | 14,968 | 31,881
Deposits | 4,137,573 | 4,073,604
Borrowings | 1,326,216 | 1,198,646
Interest payable on deposits | 2,736 | 675
Interest payable on borrowings | 3,940 | 2,427
Fair Value [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 54,160 | 128,864
Investment securities available for sale | 726,920 | 725,085
Investment securities held to maturity | 592,814 | 579,499
Loans held-for-sale | 997 | 863
Net loans receivable | 4,542,467 | 4,367,150
Interest receivable | 20,326 | 18,510
Interest rate swaps | 14,968 | 31,881
Deposits | 4,132,952 | 4,055,543
Borrowings | 1,334,788 | 1,199,601
Interest payable on deposits | 2,736 | 675
Interest payable on borrowings | 3,940 | 2,427
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 54,160 | 128,864
Interest receivable | 5 | 32
Deposits | 1,881,414 | 2,056,966
Interest payable on deposits | 333 | 469
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 725,920 | 724,085
Investment securities held to maturity | 592,814 | 579,499
Loans held-for-sale | 997 | 863
Interest receivable | 6,174 | 5,252
Interest rate swaps | 14,968 | 31,881
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 1,000 | 1,000
Net loans receivable | 4,542,467 | 4,367,150
Interest receivable | 14,147 | 13,226
Deposits | 2,251,538 | 1,998,577
Borrowings | 1,334,788 | 1,199,601
Interest payable on deposits | 2,403 | 206
Interest payable on borrowings | $ 3,940 | $ 2,427

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