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Leases - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Oct. 27, 2020 Branches
Leases [Abstract] |  |  |
Undiscounted contract amount operating leases not yet commenced |  | $ 2.9 |
PB | Branches closure |  |  |
Leases |  |  |
Asset impairment charges | $ 15.9 |  |
Number of branches closed | Branches |  |  | 11
Minimum |  |  |
Leases |  |  |
Remaining lease term of contract |  | 1 month 6 days |
Operating lease contract not yet commenced |  | 10 years |
Maximum |  |  |
Leases |  |  |
Remaining lease term of contract |  | 32 years 3 months 18 days |
Lessee remaining lease renewal term |  | 20 years |
Operating lease contract not yet commenced |  | 20 years |

X
- Definition Remaining term of lessee's operating and finance lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Remaining term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- 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 Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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