Loans Held For Investment, Loans Held For Sale, Notes, Certificates and Secured Borrowings - Allowance For Credit Losses (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
Feb. 01, 2021	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning of period			$ 36,132	$ 0
Credit loss expense for loans and leases held for investment			34,976	58,529
Initial allowance for PCD loans acquired during the period			0	12,440
Charge-offs, gross			(246)	(246)
Charge-offs, net of recoveries	$ 12,400		219	358
Allowance for loan and lease losses, end of period			71,081	71,081
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, beginning of period			410	0
Credit loss expense for unfunded lending commitments			(20)	390
Reserve for unfunded lending commitments, end of period			390	390
Initial allowance for PCD assets acquired during the period at acquisition date				30,378
PCD Loans Acquired
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge-offs, gross		$ (18,000)
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning of period			19,785	0
Credit loss expense for loans and leases held for investment			34,317	53,499
Initial allowance for PCD loans acquired during the period			0	603
Charge-offs, gross			(90)	(90)
Charge-offs, net of recoveries			46	46
Allowance for loan and lease losses, end of period			54,058	54,058
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, beginning of period			6	0
Credit loss expense for unfunded lending commitments			(6)	0
Reserve for unfunded lending commitments, end of period			0	0
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning of period			16,347	0
Credit loss expense for loans and leases held for investment			659	5,030
Initial allowance for PCD loans acquired during the period			0	11,837
Charge-offs, gross			(156)	(156)
Charge-offs, net of recoveries			173	312
Allowance for loan and lease losses, end of period			17,023	17,023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, beginning of period			404	0
Credit loss expense for unfunded lending commitments			(14)	390
Reserve for unfunded lending commitments, end of period			$ 390	$ 390

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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