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FAIR VALUE MEASUREMENT - FV of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Mortgage servicing rights – multifamily and SBA	$ 76,617
Carrying Value
Assets:
Cash and cash equivalents	72,828	$ 65,214
Investment securities HTM	2,441	4,169
Single family LHFI	7,378,952	5,488,439
Federal Home Loan Bank stock	49,305	10,361
Liabilities:
Certificates of deposit	2,943,331	906,928
Borrowings	1,016,000	41,000
Long-term debt	224,404	126,026
Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	72,828	65,214
Investment securities HTM	2,385	4,305
Single family LHFI	6,988,363	5,588,719
Federal Home Loan Bank stock	49,305	10,361
Liabilities:
Certificates of deposit	2,910,301	906,064
Borrowings	1,014,973	41,000
Long-term debt	202,338	116,845
Level 1 | Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	72,828	65,214
Investment securities HTM	0	0
Single family LHFI	0	0
Federal Home Loan Bank stock	0	0
Liabilities:
Certificates of deposit	0	0
Borrowings	0	0
Long-term debt	0	0
Level 2 | Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	0	0
Investment securities HTM	2,385	4,305
Single family LHFI	0	0
Federal Home Loan Bank stock	49,305	10,361
Liabilities:
Certificates of deposit	2,910,301	906,064
Borrowings	1,014,973	41,000
Long-term debt	202,338	116,845
Level 3 | Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	0	0
Investment securities HTM	0	0
Single family LHFI	6,988,363	5,588,719
Federal Home Loan Bank stock	0	0
Liabilities:
Certificates of deposit	0	0
Borrowings	0	0
Long-term debt	0	0
Multifamily | Carrying Value
Assets:
LHFS – multifamily and other	3,252	48,090
Mortgage servicing rights – multifamily and SBA	35,256	39,415
Multifamily | Estimate of Fair Value Measurement
Assets:
LHFS – multifamily and other	3,291	48,425
Mortgage servicing rights – multifamily and SBA	39,792	43,199
Multifamily | Level 1 | Estimate of Fair Value Measurement
Assets:
LHFS – multifamily and other	0	0
Mortgage servicing rights – multifamily and SBA	0	0
Multifamily | Level 2 | Estimate of Fair Value Measurement
Assets:
LHFS – multifamily and other	3,291	48,425
Mortgage servicing rights – multifamily and SBA	0	0
Multifamily | Level 3 | Estimate of Fair Value Measurement
Assets:
LHFS – multifamily and other	0	0
Mortgage servicing rights – multifamily and SBA	39,792	43,199
Ginnie Mae Early Buyout Loans
Assets:
Other assets - GNMA EBO loans	6,900	12,300
Ginnie Mae Early Buyout Loans | Carrying Value
Assets:
Other assets - GNMA EBO loans	6,918	12,342
Ginnie Mae Early Buyout Loans | Estimate of Fair Value Measurement
Assets:
Other assets - GNMA EBO loans	6,918	12,342
Ginnie Mae Early Buyout Loans | Level 1 | Estimate of Fair Value Measurement
Assets:
Other assets - GNMA EBO loans	0	0
Ginnie Mae Early Buyout Loans | Level 2 | Estimate of Fair Value Measurement
Assets:
Other assets - GNMA EBO loans	0	0
Ginnie Mae Early Buyout Loans | Level 3 | Estimate of Fair Value Measurement
Assets:
Other assets - GNMA EBO loans	$ 6,918	$ 12,342

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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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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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 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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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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