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Affordable Housing Projects Tax Credit Partnerships - Additional Information (Details) - USD ($) | 9 Months Ended |
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Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Equity Method Investments And Joint Ventures [Abstract] |  |  |
Net affordable housing tax credit investments and related unfunded commitments | $ 126,900,000 |  | $ 138,900,000
Write down from impairment of LIHTC Investments | $ 0 | $ 0 |

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- Definition Amount of write-down from impairment of an investment in a qualified affordable housing project. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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