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Regulatory Capital Requirements - Capital Conservation Buffer (Details) | Sep. 30, 2021 | Dec. 31, 2020
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Effective CET1 capital to risk-weighted assets (as a percent) | 4.50 | 4.50
Effective Tier 1 capital to risk-weighted assets (as a percent) | 12.63 | 12.47
Effective total capital to risk-weighted assets (as a percent) | 13.88 | 13.73
Capital conservation buffer |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Effective CET1 capital to risk-weighted assets (as a percent) | 7 |
Effective Tier 1 capital to risk-weighted assets (as a percent) | 8.5 |
Effective total capital to risk-weighted assets (as a percent) | 10.5 |
Capital requirements above regulatory rate (as a percent) | 2.50% |

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- Definition Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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