Loans And Leases Receivable, Measurement Input

No definition available.

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Namespace Prefix:	tcf_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of input used to measure derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DerivativeAssetMeasurementInput
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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ Details

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

+ Details

Name:	us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of input used to measure servicing asset.

+ References

+ Details

Name:	us-gaap_ServicingAssetMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Details

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Data Type:	na
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- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
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- Details

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- Details

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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Data Type:	na
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- Details

Name:	us-gaap_IncomeStatementLocationAxis=tcf_GainonsaleofloansnetMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_FinancialInstrumentAxis=tcf_LoansHeldForSaleMember
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Fair Value Measurements - Narrative (Details)	12 Months Ended
Fair Value Measurements - Narrative (Details)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Amount of loans recorded under the fair value option that were delinquent or on non-accrual status	$ 0	$ 0
Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities	$ 0	0
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Swap agreement, measurement input	0.14
Loans and leases, measurement input	0.100
Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Swap agreement, measurement input	0.04
Minimum \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan servicing rights, measurement input	0.10
Other real estate owned, measurement input	0.100
Minimum \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan servicing rights, measurement input	0.08
Maximum \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan servicing rights, measurement input	0.15
Maximum \| Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan servicing rights, measurement input	0.40
Gains on sales loans, net \| Loans held-for-sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net gain from initial measurement of the correspondent lending loans held for sale and subsequent changes in fair value for loans outstanding	$ 100,800,000	$ 27,900,000	$ 10,000,000.0