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Leases - Summary of Remaining Maturity of Undiscounted Lease Receivables (Details) $ in Millions | Jun. 30, 2021 USD ($)
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Leases [Abstract] |
2021 | $ 17
2022 | 53
2023 | 287
2024 | 308
2025 | 404
Thereafter | 880
Total lease payments | 1,949
Plus: deferred origination costs | 28
Less: unearned income | (103)
Total lease finance receivables, net | $ 1,874

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- Definition Direct Financing Leases, Lease Receivable, Payments to be Received, Five Years. + References No definition available. + Details
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Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases, Lease Receivable, Payments to be Received, Four Years. + References No definition available. + Details
Name: | nycb_DirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months + References No definition available. + Details
Name: | nycb_DirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases, Lease Receivable, Payments to be Received, Thereafter. + References No definition available. + Details
Name: | nycb_DirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases, Lease Receivable, Payments to be Received, Three Years. + References No definition available. + Details
Name: | nycb_DirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases, Lease Receivable, Payments to be Received, Total. + References No definition available. + Details
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Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases, Lease Receivable, Payments to be Received, Two Years. + References No definition available. + Details
Name: | nycb_DirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount + References No definition available. + Details
Name: | nycb_DirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121585684&loc=d3e40246-112709 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121585684&loc=d3e40588-112709 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121598990&loc=d3e40879-112712 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term, guaranteed by lessee or other third party unrelated to lessor, from direct financing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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