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Fair Value of Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 1,231,691 | $ 714,263
Investment securities held to maturity, amortized cost | 37,888 | 576,652
Investment securities held to maturity | 38,683 | 584,678
Interest rate swaps, liabilities | 369 | 140
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 | 1,230,691 | 713,263
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 | 129,305 | 38,935
Investment securities available for sale | 1,231,691 | 714,263
Investment securities held to maturity, amortized cost | 37,888 | 576,652
Loans held-for-sale | 10,495 | 12,267
Net loans receivable | 4,572,306 | 4,645,654
FHLB Stock | 63,739 | 64,190
Interest receivable | 19,393 | 19,360
Interest rate swaps and caps | 2,430 | 3,856
Deposits | 4,197,250 | 4,147,610
Borrowings | 1,281,118 | 1,321,982
Interest payable on deposits | 2,720 | 3,106
Interest payable on borrowings | 3,621 | 3,899
Interest rate swaps, liabilities | 369 | 140
Fair Value [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 129,305 | 38,935
Investment securities available for sale | 1,231,691 | 714,263
Investment securities held to maturity | 38,683 | 584,678
Loans held-for-sale | 10,700 | 12,501
Net loans receivable | 4,533,681 | 4,630,853
Interest receivable | 19,393 | 19,360
Interest rate swaps and caps | 2,430 | 3,856
Deposits | 4,205,384 | 4,152,558
Borrowings | 1,296,639 | 1,337,560
Interest payable on deposits | 2,720 | 3,106
Interest payable on borrowings | 3,621 | 3,899
Interest rate swaps, liabilities | 369 | 140
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 | 129,305 | 38,935
Interest receivable | 23 | 11
Deposits | 2,054,548 | 1,943,154
Interest payable on deposits | 366 | 367
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 | 1,230,691 | 713,263
Investment securities held to maturity | 38,683 | 584,678
Loans held-for-sale | 10,700 | 12,501
Interest receivable | 5,357 | 5,278
Interest rate swaps and caps | 2,430 | 3,856
Interest rate swaps, liabilities | 369 | 140
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 | 4,533,681 | 4,630,853
Interest receivable | 14,013 | 14,071
Deposits | 2,150,836 | 2,209,404
Borrowings | 1,296,639 | 1,337,560
Interest payable on deposits | 2,354 | 2,739
Interest payable on borrowings | $ 3,621 | $ 3,899

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