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LOANS HELD FOR INVESTMENT - Corporation's TDR Activity (Detail) - Entity Loan Modification Program [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Beginning Balance of TDRs	$ 450,078	$ 496,207	$ 479,196	$ 487,997
New TDRs	23,078	3,187	30,216	31,733
Increases to existing TDRs (disbursements)	0	2,210	57	5,821
Charge-offs post modification	(13,211)	(4,548)	(16,706)	(8,063)
Sales, net of charge-offs	(17,492)	0	(17,492)	0
Foreclosures	(1,074)	(309)	(2,684)	(1,947)
Removed from TDR classification	0	0	(6,023)	0
Paid-off and partial payments	(12,779)	(8,132)	(37,964)	(26,926)
Ending balance of TDRs	428,600	$ 488,615	428,600	$ 488,615
Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Sales, net of charge-offs	(52,500)		(52,500)
Residential Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Charge-offs post modification	$ (12,500)		$ (29,900)

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Disbursements during the period on existing commitments of TDRs loans.

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Recorded investment in loans that were modified under troubled debt restructurings during the period.

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Repayments related to Trouble Debt Restructuring Loans.

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Total loans that had been previously modified under troubled debt restructurings that are compliance with the terms of the restructuring agreement, and yield a market interest rate at the time of the restructuring.

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Financing Receivable, Troubled Debt Restructuring, Sales, Net of Charge Offs

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Amount of real estate investments acquired through foreclosure during the period related to troubled debt restructurings.

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Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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Reflects the amount of the write-down related to a troubled debt restructuring.

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