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LOANS & ALLOWANCE FOR CREDIT LOSSES - LOAN PORTFOLIO COMPOSITION (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 07, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | $ 19,316,962 |  |  | $ 16,652,026 |  |  |
Allowance for credit losses - loans | (257,522) | $ (251,749) |  | (166,680) | $ (161,293) | $ (157,218) | $ (148,617)
Unaccreted premiums (discounts) and loan fees | (325,985) |  |  | (28,618) |  |  |
Total net loans | 18,733,455 |  |  | 16,456,728 |  |  |
Single Family - Mortgage & Warehouse |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 4,122,726 |  |  | 4,173,833 |  |  |
Allowance for credit losses - loans | (16,965) | (15,356) |  | (17,503) | (18,452) | (19,631) | (19,670)
Multifamily and Commercial Mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 4,001,056 |  |  | 3,082,225 |  |  |
Allowance for credit losses - loans | (76,358) | (78,353) |  | (16,848) | (14,301) | (15,457) | (14,655)
Multifamily and Commercial Mortgage | Real Estate Loan Portfolios |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 285,400 |  |  |  |  |  |
Commercial Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 5,912,988 |  |  | 6,199,818 |  |  |
Allowance for credit losses - loans | (82,842) | (77,778) |  | (72,755) | (68,386) | (72,168) | (69,339)
Commercial Real Estate | Real Estate Loan Portfolios |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 44,500 |  |  |  |  |  |
Total net loans |  |  | $ 1,300,000 |  |  |  |
Commercial & Industrial - Non-RE |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 4,827,531 |  |  | 2,639,650 |  |  |
Allowance for credit losses - loans | (72,010) | (69,201) |  | (46,347) | (46,736) | (36,038) | (30,808)
Auto & Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 450,765 |  |  | 546,264 |  |  |
Allowance for credit losses - loans | (9,339) | (11,052) |  | (13,212) | (13,403) | (13,903) | (14,114)
Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 1,896 |  |  | 10,236 |  |  |
Allowance for credit losses - loans | $ (8) | $ (9) |  | $ (15) | $ (15) | $ (21) | $ (31)

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