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Regulatory Matters - Additional Information (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Banking and Thrift [Abstract] |  |
Minimum ratio of tier 1 capital to total adjusted assets | 4.00% |
Minimum ratio of common equity tier 1 to risk-weighted assets | 6.375% |
Minimum ratio of tier 1 leverage ratio, For capital adequacy purposes | 7.875% | 4.00%
Minimum ratio of total capital to risk-weighted assets | 9.875% |
Tier 1 capital ratio, To be well capitalized | 5.00% |
Common equity tier 1 risk-based ratio, To be well capitalized | 6.50% |
Tier 1 risk-based capital, To be well capitalized under prompt corrective action ratio | 8.00% |
Total risk-based capital, To be well capitalized under prompt corrective action ratio | 10.00% |

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- Definition Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets + References No definition available. + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + 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=84167132&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 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: 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=84167132&loc=d3e65071-112826 + Details
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