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Capital Requirements and Other Regulatory Matters - Additional Information (Details) | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017 | Jan. 01, 2016 | Dec. 31, 2014
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Schedule of Capitalization [Line Items] |  |  |  |  |
Common equity tier one risk based capital required for capital adequacy to risk weighted assets |  |  |  |  | 4.50%
Total capital to risk-weighted assets |  |  |  |  | 0.08
Tier 1 leverage ratio |  |  |  |  | 0.04
Capital conservation buffer percentage increase | 0.625% | 0.625% | 0.625% |  |
Capital Conservation Buffer Percentage | 2.50% |  |  | 0.625% |
Minimum [Member] |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |
Tier 1 capital to risk-weighted assets |  |  |  |  | 0.04
Maximum [Member] |  |  |  |  |
Schedule of Capitalization [Line Items] |  |  |  |  |
Tier 1 capital to risk-weighted assets |  |  |  |  | 0.06

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- Definition Common equity tier one risk based capital required for capital adequacy to risk weighted assets. + References No definition available. + Details
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- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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