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Supplementary Regulatory Capital Disclosure (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | WEX Bank’s actual and regulatory minimum capital amounts and ratios are presented in the following table:
(In thousands) | Actual Amount |  | Ratio |  | Minimum for Capital Adequacy Purposes Amount |  | Ratio |  | Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions Amount |  | Ratio
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Total Capital to risk-weighted assets | $ | 353,314 |  |  | 12.61 | % |  | $ | 224,084 |  |  | 8.0 | % |  | $ | 280,104 |  |  | 10.0 | %
Tier 1 Capital to average assets | $ | 335,847 |  |  | 10.93 | % |  | $ | 122,925 |  |  | 4.0 | % |  | $ | 153,656 |  |  | 5.0 | %
Common equity to risk-weighted assets | $ | 335,847 |  |  | 11.99 | % |  | $ | 126,047 |  |  | 4.5 | % |  | $ | 182,068 |  |  | 6.5 | %
Tier 1 Capital to risk-weighted assets | $ | 335,847 |  |  | 11.99 | % |  | $ | 168,063 |  |  | 6.0 | % |  | $ | 224,084 |  |  | 8.0 | %
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Total Capital to risk-weighted assets | $ | 316,129 |  |  | 13.38 | % |  | $ | 188,991 |  |  | 8.0 | % |  | $ | 236,239 |  |  | 10.0 | %
Tier 1 Capital to average assets | $ | 304,555 |  |  | 12.50 | % |  | $ | 97,452 |  |  | 4.0 | % |  | $ | 121,815 |  |  | 5.0 | %
Common equity to risk-weighted assets | $ | 304,555 |  |  | 12.89 | % |  | $ | 106,308 |  |  | 4.5 | % |  | $ | 153,555 |  |  | 6.5 | %
Tier 1 Capital to risk-weighted assets | $ | 304,555 |  |  | 12.89 | % |  | $ | 141,743 |  |  | 6.0 | % |  | $ | 188,991 |  |  | 8.0 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 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=84167132&loc=d3e65071-112826 Reference 3: 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 4: 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 + Details
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