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SECURITIES - Securities Available for Sale (Details) - USD ($) | Sep. 30, 2023 | Jun. 30, 2023
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Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | $ 1,400,273,000 | $ 1,383,867,000
Gross Unrealized Gains | 1,125,000 | 274,000
Gross Unrealized Losses | 185,765,000 | 156,412,000
Allowance for Credit Losses | 0 | 0
Fair Value | 1,215,633,000 | 1,227,729,000
Debt securities |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 706,188,000 | 679,862,000
Gross Unrealized Gains | 1,125,000 | 272,000
Gross Unrealized Losses | 28,362,000 | 31,950,000
Allowance for Credit Losses | 0 | 0
Fair Value | 678,951,000 | 648,184,000
Asset-backed securities |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 132,267,000 | 138,281,000
Gross Unrealized Gains | 100,000 | 4,000
Gross Unrealized Losses | 1,791,000 | 2,115,000
Allowance for Credit Losses | 0 | 0
Fair Value | 130,576,000 | 136,170,000
Collateralized loan obligations |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 414,307,000 | 381,915,000
Gross Unrealized Gains | 1,025,000 | 268,000
Gross Unrealized Losses | 2,635,000 | 5,187,000
Allowance for Credit Losses | 0 | 0
Fair Value | 412,697,000 | 376,996,000
Corporate bonds |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 159,614,000 | 159,666,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 23,936,000 | 24,648,000
Allowance for Credit Losses | 0 | 0
Fair Value | 135,678,000 | 135,018,000
Mortgage-backed securities |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 694,085,000 | 704,005,000
Gross Unrealized Gains | 0 | 2,000
Gross Unrealized Losses | 157,403,000 | 124,462,000
Allowance for Credit Losses | 0 | 0
Fair Value | 536,682,000 | 579,545,000
Residential pass-through securities |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 530,179,000 | 539,506,000
Gross Unrealized Gains | 0 | 2,000
Gross Unrealized Losses | 129,961,000 | 103,357,000
Allowance for Credit Losses | 0 | 0
Fair Value | 400,218,000 | 436,151,000
Commercial pass-through securities |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 163,906,000 | 164,499,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 27,442,000 | 21,105,000
Allowance for Credit Losses | 0 | 0
Fair Value | $ 136,464,000 | $ 143,394,000

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