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MORTGAGE BANKING OPERATIONS - Revenue from Mortgage Servicing (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Servicing income, net:
Servicing fees and other	$ 9,245	$ 7,860	$ 18,158	$ 15,853
Amortization of single family MSRs	(5,181)	(4,351)	(10,874)	(7,845)
Amortization of multifamily and SBA MSRs	(2,133)	(1,259)	(3,477)	(2,734)
Net servicing income	1,931	2,250	3,807	5,274
Risk management, single family MSRs:
Changes in fair value of MSRs due to assumptions	(5,024)	(2,166)	6,439	(19,010)
Mortgage servicing rights, risk management	0	152	(1,128)	3,229
Loan servicing income	1,931	2,402	2,679	8,503
Servicing contracts
Risk management, single family MSRs:
Net gain (loss) from derivative hedging	$ 5,024	$ 2,318	$ (7,567)	$ 22,239

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Changes in the fair value of mortgage servicing rights due to modeled amortization.

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Changes in MSR fair value due to changes in model inputs and assumptions, net of risk management derivatives.

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Servicing and other related fees, net of payments.

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Risk Management, Single Family MSRs [Abstract]

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Servicing fees and other.

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Servicing Fees Net, Including Discontinued Operations

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Servicing Income, Net [Abstract]

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The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(ii)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

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