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FAIR VALUE MEASUREMENT - FV of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Single family mortgage servicing rights	$ 61,206
Other assets - GNMA EBO loans	5,299,741	$ 5,179,886
Carrying Value
Assets:
Cash and cash equivalents	218,662	58,049
Investment securities HTM	4,195	4,271
LHFI	5,295,234	5,172,778
Federal Home Loan Bank stock	8,723	20,319
Liabilities:
Certificates of deposit	995,475	1,139,807
Borrowings		322,800
Long-term debt	125,979	125,838
Fair Value
Assets:
Cash and cash equivalents	218,662	58,049
Investment securities HTM	4,349	4,507
LHFI	5,337,837	5,327,711
Federal Home Loan Bank stock	8,723	20,319
Liabilities:
Certificates of deposit	996,743	1,143,747
Borrowings		322,876
Long-term debt	117,577	116,893
Multifamily | Carrying Value
Assets:
LHFS – multifamily and other	259,170	167,289
Single family mortgage servicing rights	39,625	35,774
Multifamily | Fair Value
Assets:
LHFS – multifamily and other	267,688	167,289
Single family mortgage servicing rights	43,166	38,423
Other assets - GNMA EBO loans | Carrying Value
Assets:
Other assets - GNMA EBO loans	31,553	101,750
Other assets - GNMA EBO loans | Fair Value
Assets:
Other assets - GNMA EBO loans	31,553	101,750
Level 1 | Fair Value
Assets:
Cash and cash equivalents	218,662	58,049
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
Single family mortgage servicing rights	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	4,349	4,507
LHFI	0	0
Federal Home Loan Bank stock	8,723	20,319
Liabilities:
Certificates of deposit	996,743	1,143,747
Borrowings		322,876
Long-term debt	117,577	116,893
Level 2 | Multifamily | Fair Value
Assets:
LHFS – multifamily and other	267,688	167,289
Single family mortgage servicing rights	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	5,337,837	5,327,711
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
Single family mortgage servicing rights	43,166	38,423
Level 3 | Other assets - GNMA EBO loans | Fair Value
Assets:
Other assets - GNMA EBO loans	$ 31,553	$ 101,750

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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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Amount excluding accrued interest, after allowance for credit loss, of financing receivable.

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

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