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REGULATORY MATTERS - Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Corporation |  |
Capital |  |
Capital | $ 606,487 | $ 602,258
Capital to Risk Weighted Assets (percent) | 0.1346 | 0.158
Capital Required for Capital Adequacy | $ 472,950 | $ 400,201
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.105 | 0.105
Common equity capital | $ 559,755 | $ 562,492
Common Equity Capital to Risk Weighted Assets | 12.43% | 14.76%
Common equity capital required for capital adequacy | $ 315,300 | $ 266,800
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Tier I risk-based capital |  |
Tier One Risk Based Capital | $ 559,755 | $ 562,492
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1243 | 0.1476
Tier One Risk Based Capital Required for Capital Adequacy | $ 382,864 | $ 323,972
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.085 | 0.085
Tier I leverage capital |  |
Tier One Leverage Capital | $ 559,755 | $ 562,492
Tier One Leverage Capital to Average Assets (percent) | 0.1038 | 0.1214
Tier One Leverage Capital Required for Capital Adequacy | $ 215,779 | $ 185,309
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 0.04 | 0.04
First Financial Bank |  |
Capital |  |
Capital | $ 615,765 | $ 560,975
Capital to Risk Weighted Assets (percent) | 0.1381 | 0.1489
Capital Required for Capital Adequacy | $ 468,183 | $ 395,567
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.105 | 0.105
Capital Required to be Well Capitalized | $ 445,889 | $ 376,731
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.10 | 0.10
Common equity capital | $ 569,033 | $ 521,209
Common Equity Capital to Risk Weighted Assets | 12.76% | 13.84%
Common equity capital required for capital adequacy | $ 312,122 | $ 263,712
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Common equity capital required to be well capitalized | $ 289,828 | $ 244,875
Common Equity Capital required to be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Tier I risk-based capital |  |
Tier One Risk Based Capital | $ 569,033 | $ 521,209
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1276 | 0.1384
Tier One Risk Based Capital Required for Capital Adequacy with Buffer | $ 379,005 | $ 320,221
Tier One Risk Based Capital Required for Capital Adequacy with Buffer to Risk Weighted Assets (percent) | 0.085 | 0.085
Tier One Risk Based Capital Required to be Well Capitalized | $ 356,711 | $ 301,385
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.08 | 0.08
Tier I leverage capital |  |
Tier One Leverage Capital | $ 569,033 | $ 521,209
Tier One Leverage Capital to Average Assets (percent) | 0.1026 | 0.1073
Tier One Leverage Capital Required for Capital Adequacy | $ 221,899 | $ 194,384
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 0.04 | 0.04
Tier One Leverage Capital Required to be Well Capitalized | $ 277,374 | $ 242,981
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 0.05 | 0.05

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