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MORTGAGE BANKING OPERATIONS - Loans Serviced for Others (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced for others	$ 7,689,878	$ 7,758,833
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced for others	2,064,492	1,844,241
Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced for others	$ 5,625,386	$ 5,914,592

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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