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LOANS HELD FOR INVESTMENT, NET - Past Due Status (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | $ 10,850,611,000 | $ 10,566,831,000
Non-accrual | 23,320,000 | 34,237,000
Accruing Loans 90 Days or More Past Due | 0 | 0
Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 58,331,000 | 58,496,000
30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 22,961,000 | 23,517,000
60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 12,050,000 | 742,000
Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 10,792,280,000 | 10,508,335,000
Business loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,271,768,000 | 2,211,857,000
Non-accrual | 19,555,000 | 27,787,000
Business loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 37,399,000 | 34,389,000
Business loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 16,693,000 | 5,861,000
Business loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 1,151,000 | 741,000
Business loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,234,369,000 | 2,177,468,000
One-to-four family residential and cooperative/condominium apartment |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 892,869,000 | 773,321,000
Non-accrual | 2,874,000 | 3,203,000
One-to-four family residential and cooperative/condominium apartment | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 5,957,000 | 3,889,000
One-to-four family residential and cooperative/condominium apartment | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 439,000 | 686,000
One-to-four family residential and cooperative/condominium apartment | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,644,000 |
One-to-four family residential and cooperative/condominium apartment | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 886,912,000 | 769,432,000
Multifamily residential and residential mixed-use |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 4,102,024,000 | 4,026,826,000
Non-accrual | 0 |
Multifamily residential and residential mixed-use | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,794,000 | 4,817,000
Multifamily residential and residential mixed-use | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,976,000 | 4,817,000
Multifamily residential and residential mixed-use | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 818,000 |
Multifamily residential and residential mixed-use | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Multifamily residential and residential mixed-use | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 4,098,230,000 | 4,022,009,000
Non-owner-occupied commercial real estate |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,374,281,000 | 3,317,485,000
Non-owner-occupied commercial real estate | Total real estate loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,374,281,000 | 3,317,485,000
Non-accrual | 15,000 | 2,491,000
Non-owner-occupied commercial real estate | Total real estate loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 9,653,000 | 14,380,000
Non-owner-occupied commercial real estate | Total real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,851,000 | 11,889,000
Non-owner-occupied commercial real estate | Total real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 6,787,000 |
Non-owner-occupied commercial real estate | Total real estate loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 3,364,628,000 | 3,303,105,000
Acquisition, development, and construction ("ADC") |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 203,402,000 | 229,663,000
Non-accrual | 657,000 | 657,000
Acquisition, development, and construction ("ADC") | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 1,307,000 | 657,000
Acquisition, development, and construction ("ADC") | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Acquisition, development, and construction ("ADC") | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 650,000 |
Acquisition, development, and construction ("ADC") | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Acquisition, development, and construction ("ADC") | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 202,095,000 | 229,006,000
Other Loans |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 6,267,000 | 7,679,000
Non-accrual | 219,000 | 99,000
Other Loans | Total Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 221,000 | 364,000
Other Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 2,000 | 264,000
Other Loans | 60 to 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 | 1,000
Other Loans | Loans 90 Days or More Past Due and Still Accruing Interest |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | 0 |
Other Loans | Current |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Loans | $ 6,046,000 | $ 7,315,000

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