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FAIR VALUE MEASUREMENT - FV of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Mortgage servicing rights – multifamily and SBA	$ 76,470
Other assets - GNMA EBO loans	7,400,501	$ 7,384,820
Carrying Value
Assets:
Cash and cash equivalents	226,704	72,828
Investment securities HTM	2,389	2,441
LHFI	7,399,276	7,378,952
Federal Home Loan Bank stock	59,330	49,305
Liabilities:
Certificates of deposit	2,947,378	2,943,331
Borrowings	1,873,000	1,016,000
Long-term debt	224,671	224,404
Fair Value
Assets:
Cash and cash equivalents	226,704	72,828
Investment securities HTM	2,293	2,385
LHFI	6,858,955	6,988,363
Federal Home Loan Bank stock	59,330	49,305
Liabilities:
Certificates of deposit	2,929,803	2,910,301
Borrowings	1,856,840	1,014,973
Long-term debt	150,333	202,338
Multifamily | Carrying Value
Assets:
LHFS – multifamily and other	9,934	3,252
Mortgage servicing rights – multifamily and SBA	31,141	35,256
Multifamily | Fair Value
Assets:
LHFS – multifamily and other	9,959	3,291
Mortgage servicing rights – multifamily and SBA	36,271	39,792
Other assets - GNMA EBO loans | Carrying Value
Assets:
Other assets - GNMA EBO loans	5,558	6,918
Other assets - GNMA EBO loans | Fair Value
Assets:
Other assets - GNMA EBO loans	5,558	6,918
Level 1 | Fair Value
Assets:
Cash and cash equivalents	226,704	72,828
Investment securities HTM	0	0
LHFI	0	0
Federal Home Loan Bank stock	0	0
Liabilities:
Certificates of deposit	0	0
Borrowings		0
Long-term debt	0	0
Level 1 | Multifamily | Fair Value
Assets:
LHFS – multifamily and other	0	0
Mortgage servicing rights – multifamily and SBA	0	0
Level 1 | Other assets - GNMA EBO loans | Fair Value
Assets:
Other assets - GNMA EBO loans	0	0
Level 2 | Fair Value
Assets:
Cash and cash equivalents	0	0
Investment securities HTM	2,293	2,385
LHFI	0	0
Federal Home Loan Bank stock	59,330	49,305
Liabilities:
Certificates of deposit	2,929,803	2,910,301
Borrowings	1,856,840	1,014,973
Long-term debt	150,333	202,338
Level 2 | Multifamily | Fair Value
Assets:
LHFS – multifamily and other	9,959	3,291
Mortgage servicing rights – multifamily and SBA	0	0
Level 2 | Other assets - GNMA EBO loans | Fair Value
Assets:
Other assets - GNMA EBO loans	0	0
Level 3 | Fair Value
Assets:
Cash and cash equivalents	0	0
Investment securities HTM	0	0
LHFI	6,858,955	6,988,363
Federal Home Loan Bank stock	0	0
Liabilities:
Certificates of deposit	0	0
Borrowings		0
Long-term debt	0	0
Level 3 | Multifamily | Fair Value
Assets:
LHFS – multifamily and other	0	0
Mortgage servicing rights – multifamily and SBA	36,271	39,792
Level 3 | Other assets - GNMA EBO loans | Fair Value
Assets:
Other assets - GNMA EBO loans	$ 5,558	$ 6,918

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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