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Organization and Basis of Presentation - Reorganization and Stock Offerings (Details) - USD ($) $ / shares in Units, $ in Billions | Feb. 17, 2017 | Aug. 09, 2016 | Apr. 01, 2016 | Sep. 30, 2017 | Jun. 30, 2015
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Reorganization Transactions |  |  |  |  |
Threshold of U.S. non-branch assets of foreign banking organization which will require a U.S. intermediate holding company |  |  |  |  | $ 50
BNP Paribas | First Hawaiian, Inc. |  |  |  |  |
Reorganization Transactions |  |  |  |  |
Outstanding common stock owned after sales of shares (as a percent) | 62.00% |  |  |  |
Outstanding common stock owned (as a percent) |  |  |  | 62.00% |
Initial public offering | BNP Paribas | First Hawaiian, Inc. |  |  |  |  |
Reorganization Transactions |  |  |  |  |
Ownership interest sold (as a percent) |  | 17.00% |  |  |
Number of shares sold |  | 24,250,000 |  |  |
Offering price (in dollars per share) |  | $ 23.00 |  |  |
Reorganization Transactions on April 1, 2016 | BancWest Corporation (BancWest) | Bank of the West (BOW) | BancWest Holding Inc. (BWHI) |  |  |  |  |
Reorganization Transactions |  |  |  |  |
Ownership prior to transactions (as a percent) |  |  | 100.00% |  |
Secondary offering | BNP Paribas | First Hawaiian, Inc. |  |  |  |  |
Reorganization Transactions |  |  |  |  |
Number of shares sold | 28,750,000 |  |  |  |
Offering price (in dollars per share) | $ 32.00 |  |  |  |
Underwriters’ option | BNP Paribas | First Hawaiian, Inc. |  |  |  |  |
Reorganization Transactions |  |  |  |  |
Number of shares sold | 3,750,000 | 3,163,043 |  |  |

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