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Regulatory Capital Requirements (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of regulatory capital ratios | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | First Hawaiian | ​ | Minimum | ​ | Well- | ​
​ | ​ | First Hawaiian, Inc. | ​ | Bank | ​ | Capital | ​ | Capitalized | ​
(dollars in thousands) |  | Amount |  | Ratio | ​ | Amount |  | Ratio | ​ | Ratio(1) |  | Ratio(1) | ​
June 30, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common equity tier 1 capital to risk-weighted assets | ​ | $ | 1,695,933 | ​ | 11.84 | % | $ | 1,685,158 | ​ | 11.76 | % | 4.50 | % | 6.50 | %
Tier 1 capital to risk-weighted assets | ​ | ​ | 1,695,933 | ​ | 11.84 | % | ​ | 1,685,158 | ​ | 11.76 | % | 6.00 | % | 8.00 | %
Total capital to risk-weighted assets | ​ | ​ | 1,835,068 | ​ | 12.81 | % | ​ | 1,824,293 | ​ | 12.73 | % | 8.00 | % | 10.00 | %
Tier 1 capital to average assets (leverage ratio) | ​ | ​ | 1,695,933 | ​ | 8.75 | % | ​ | 1,685,158 | ​ | 8.70 | % | 4.00 | % | 5.00 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2018: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common equity tier 1 capital to risk-weighted assets | ​ | $ | 1,661,542 | ​ | 11.97 | % | $ | 1,658,172 | ​ | 11.94 | % | 4.50 | % | 6.50 | %
Tier 1 capital to risk-weighted assets | ​ | ​ | 1,661,542 | ​ | 11.97 | % | ​ | 1,658,172 | ​ | 11.94 | % | 6.00 | % | 8.00 | %
Total capital to risk-weighted assets | ​ | ​ | 1,803,860 | ​ | 12.99 | % | ​ | 1,800,490 | ​ | 12.97 | % | 8.00 | % | 10.00 | %
Tier 1 capital to average assets (leverage ratio) | ​ | ​ | 1,661,542 | ​ | 8.72 | % | ​ | 1,658,172 | ​ | 8.70 | % | 4.00 | % | 5.00 | %
(1) | As defined by the regulations issued by the Board of Governors of the Federal Reserve System, the Office of the Comptroller of the Currency, and Federal Deposit Insurance Corporation (“FDIC”).

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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=117337116&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=117337116&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=117337116&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=117337116&loc=SL5958570-112826 + Details
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