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SECURITIES - Securities Available for Sale (Details) - USD ($)	Dec. 31, 2023	Jun. 30, 2023
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	$ 1,268,632,000	$ 1,383,867,000
Gross Unrealized Gains	1,239,000	274,000
Gross Unrealized Losses	125,696,000	156,412,000
Allowance for Credit Losses	0	0
Fair Value	1,144,175,000	1,227,729,000
Debt securities
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	668,006,000	679,862,000
Gross Unrealized Gains	1,221,000	272,000
Gross Unrealized Losses	22,162,000	31,950,000
Allowance for Credit Losses	0	0
Fair Value	647,065,000	648,184,000
Asset-backed securities
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	91,921,000	138,281,000
Gross Unrealized Gains	112,000	4,000
Gross Unrealized Losses	1,373,000	2,115,000
Allowance for Credit Losses	0	0
Fair Value	90,660,000	136,170,000
Collateralized loan obligations
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	425,155,000	381,915,000
Gross Unrealized Gains	1,109,000	268,000
Gross Unrealized Losses	2,131,000	5,187,000
Allowance for Credit Losses	0	0
Fair Value	424,133,000	376,996,000
Corporate bonds
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	150,930,000	159,666,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	18,658,000	24,648,000
Allowance for Credit Losses	0	0
Fair Value	132,272,000	135,018,000
Mortgage-backed securities
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	600,626,000	704,005,000
Gross Unrealized Gains	18,000	2,000
Gross Unrealized Losses	103,534,000	124,462,000
Allowance for Credit Losses	0	0
Fair Value	497,110,000	579,545,000
Residential pass-through securities
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	442,608,000	539,506,000
Gross Unrealized Gains	18,000	2,000
Gross Unrealized Losses	83,115,000	103,357,000
Allowance for Credit Losses	0	0
Fair Value	359,511,000	436,151,000
Commercial pass-through securities
Schedule of Available for Sale Securities [Line Items]
Amortized Cost	158,018,000	164,499,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	20,419,000	21,105,000
Allowance for Credit Losses	0	0
Fair Value	$ 137,599,000	$ 143,394,000

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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