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LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | $ 10,773,428 | $ 10,566,831
Total | 10,766,837 | 10,566,831
Non-accrual | 29,099 | 34,237
Accruing Loans 90 Days or More Past Due | 0 | 0
Non-accrual | 29,099 | 34,237
Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 42,366 | 58,496
30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 11,977 | 23,517
60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 1,290 | 742
Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total | 10,724,471 | 10,508,335
Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 9,694,144 | 9,487,440
Non-accrual | 14,432 | 12,192
Non-accrual | 14,432 | 12,192
Total real estate loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 22,374 | 31,884
Total real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 7,661 | 19,692
Total real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 281 |
Total real estate loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 9,671,770 | 9,455,556
One-to-four family residential and cooperative/condominium apartment |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 887,555 | 773,321
Non-accrual | 3,248 | 3,203
Non-accrual | 3,248 | 3,203
One-to-four family residential and cooperative/condominium apartment | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 7,392 | 3,889
One-to-four family residential and cooperative/condominium apartment | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 4,071 | 686
One-to-four family residential and cooperative/condominium apartment | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 73 |
One-to-four family residential and cooperative/condominium apartment | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 880,163 | 769,432
Multifamily residential and residential mixed-use |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 4,017,176 | 4,026,826
Multifamily residential and residential mixed-use | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments |  | 4,817
Multifamily residential and residential mixed-use | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments |  | 4,817
Multifamily residential and residential mixed-use | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 4,017,176 | 4,022,009
Commercial real estate ("CRE") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 4,620,900 | 4,457,630
Non-accrual | 10,527 | 8,332
Non-accrual | 10,527 | 8,332
Commercial real estate ("CRE") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 13,895 | 22,521
Commercial real estate ("CRE") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 3,160 | 14,189
Commercial real estate ("CRE") | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 208 |
Commercial real estate ("CRE") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 4,607,005 | 4,435,109
Acquisition, development, and construction ("ADC") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 168,513 | 229,663
Non-accrual | 657 | 657
Non-accrual | 657 | 657
Acquisition, development, and construction ("ADC") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 1,087 | 657
Acquisition, development, and construction ("ADC") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 430 |
Acquisition, development, and construction ("ADC") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 167,426 | 229,006
Commercial and Industrial ("C&I") Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 1,066,938 | 1,071,712
Non-accrual | 14,667 | 21,946
Non-accrual | 14,667 | 21,946
Commercial and Industrial ("C&I") Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 19,992 | 26,248
Commercial and Industrial ("C&I") Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 4,316 | 3,561
Commercial and Industrial ("C&I") Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 1,009 | 741
Commercial and Industrial ("C&I") Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 1,046,946 | 1,045,464
Other Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | 5,755 | 7,679
Non-accrual |  | 99
Non-accrual |  | 99
Other Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments |  | 364
Other Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments |  | 264
Other Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments |  | 1
Other Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total loans, net of fair value hedge basis point adjustments | $ 5,755 | $ 7,315

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