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Regulatory Capital Requirements - Capital Conservation Buffer (Details) | Sep. 30, 2019 | Dec. 31, 2018 | Jan. 01, 2016
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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) | 12.15% | 11.97% |
Effective total capital to risk-weighted assets (as a percent) | 13.11% | 12.99% |
Capital conservation buffer |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Phased in rate (as a percent) |  |  | 0.625%
Annual increase after initial year (as a percent) | 0.625% |  |
Capital requirements above regulatory rate (as a percent) | 2.50% |  |
Effective CET1 capital to risk-weighted assets (as a percent) | 7.00% |  |
Effective Tier 1 capital to risk-weighted assets (as a percent) | 8.50% |  |
Effective total capital to risk-weighted assets (as a percent) | 10.50% |  |

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- Definition The maximum capital conservation buffer as a percentage of risk weighted assets as defined by regulations. + References No definition available. + Details
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- Definition Capital conservation buffer as a percentage of risk weighted assets in year one as defined by regulations. + References No definition available. + Details
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- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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- Definition Percentage of Common Equity Tier One Risk-based Capital to total 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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