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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 1,215,633 | $ 1,227,729
Investment securities held to maturity (fair value of $123,028 and $131,169, respectively) | 143,730 | 146,465
Fair Value | 123,028 | 131,169
Loans held-for-sale | 3,934 | 9,591
Net loans receivable | 5,689,177 | 5,780,687
Accrued interest receivable | 29,766 | 28,133
Fair Value | 80,291 | 71,624
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 57,219 | 70,515
Investment securities available for sale | 0 | 0
Fair Value | 0 | 0
Loans held-for-sale | 0 | 0
Net loans receivable | 0 | 0
FHLB Stock | 0 | 0
Accrued interest receivable | 25 | 14
Fair Value | 0 | 0
Borrowings | 0 | 0
Interest payable on deposits | 2,394 | 1,933
Interest payable on borrowings | 0 | 0
Fair Value | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Deposits other than certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 3,520,877 | 3,611,632
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investment securities available for sale | 1,215,633 | 1,227,729
Fair Value | 123,028 | 131,169
Loans held-for-sale | 3,821 | 9,442
Net loans receivable | 0 | 0
FHLB Stock | 0 | 0
Accrued interest receivable | 10,040 | 8,924
Fair Value | 80,291 | 71,624
Borrowings | 0 | 0
Interest payable on deposits | 0 | 0
Interest payable on borrowings | 0 | 0
Fair Value | 0 |
Significant Other Observable Inputs (Level 2) | Deposits other than certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 0 | 0
Significant Other Observable Inputs (Level 2) | Certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value | 0 | 0
Loans held-for-sale | 0 | 0
Net loans receivable | 5,153,943 | 5,261,808
FHLB Stock | 0 | 0
Accrued interest receivable | 19,701 | 19,195
Fair Value | 0 | 0
Borrowings | 1,616,222 |
Interest payable on deposits | 5,803 |
Interest payable on borrowings | 6,046 |
Fair Value | 0 |
Significant Unobservable Inputs (Level 3) | Deposits other than certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 0 | 0
Significant Unobservable Inputs (Level 3) | Certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 1,892,588 | 1,989,434
Carrying Amount |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 57,219 | 70,515
Investment securities available for sale | 1,215,633 | 1,227,729
Investment securities held to maturity (fair value of $123,028 and $131,169, respectively) | 143,730 | 146,465
Loans held-for-sale | 3,934 | 9,591
Net loans receivable | 5,689,177 | 5,780,687
FHLB Stock | 81,509 | 71,734
Accrued interest receivable | 29,766 | 28,133
Fair Value | 80,291 | 71,624
Borrowings | 1,626,933 | 1,506,812
Interest payable on deposits | 8,197 | 6,826
Interest payable on borrowings | 6,046 | 5,282
Fair Value | 0 |
Carrying Amount | Deposits other than certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 3,520,877 | 3,611,632
Carrying Amount | Certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 1,913,291 | 2,017,551
Fair Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 57,219 | 70,515
Investment securities available for sale | 1,215,633 | 1,227,729
Fair Value | 123,028 | 131,169
Loans held-for-sale | 3,821 | 9,442
Net loans receivable | 5,153,943 | 5,261,808
FHLB Stock | 0 | 0
Accrued interest receivable | 29,766 | 28,133
Fair Value | 80,291 | 71,624
Borrowings | 1,616,222 | 1,498,920
Interest payable on deposits | 8,197 | 6,826
Interest payable on borrowings | 6,046 | 5,282
Fair Value | 0 |
Fair Value | Deposits other than certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | 3,520,877 | 3,611,632
Fair Value | Certificates of deposits |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Deposits | $ 1,892,588 | 1,989,434
Fair Value | Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Borrowings |  | 1,498,920
Interest payable on deposits |  | 4,893
Interest payable on borrowings |  | $ 5,282

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