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REGULATORY MATTERS - Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Corporation |  |
Capital |  |
Capital | $ 602,258 | $ 561,347
Capital to Risk Weighted Assets (percent) | 0.1580 | 0.1461
Capital Required for Capital Adequacy | $ 400,201 | $ 403,400
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.10500 | 0.10500
Common equity capital | $ 562,492 | $ 521,568
Common Equity Capital to Risk Weighted Assets | 14.76% | 13.58%
Common equity capital required for capital adequacy | $ 266,800 | $ 268,933
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 | $ 562,492 | $ 521,568
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1476 | 0.1358
Tier One Risk Based Capital Required for Capital Adequacy | $ 323,972 | $ 326,562
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.08500 | 0.08500
Tier I leverage capital |  |
Tier One Leverage Capital | $ 562,492 | $ 521,568
Tier One Leverage Capital to Average Assets (percent) | 0.1214 | 0.1078
Tier One Leverage Capital Required for Capital Adequacy | $ 185,309 | $ 193,476
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 0.0400 | 0.0400
First Financial Bank |  |
Capital |  |
Capital | $ 560,975 | $ 498,246
Capital to Risk Weighted Assets (percent) | 0.1489 | 0.1314
Capital Required for Capital Adequacy | $ 395,567 | $ 398,179
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.10500 | 0.10500
Capital Required to be Well Capitalized | $ 376,731 | $ 379,219
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.1000 | 0.1000
Common equity capital | $ 521,209 | $ 458,467
Common Equity Capital to Risk Weighted Assets | 13.84% | 12.09%
Common equity capital required for capital adequacy | $ 263,712 | $ 265,453
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Common equity capital required to be well capitalized | $ 244,875 | $ 246,492
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 | $ 521,209 | $ 458,467
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1384 | 0.1209
Tier One Risk Based Capital Required for Capital Adequacy with Buffer | $ 320,221 | $ 322,336
Tier One Risk Based Capital Required for Capital Adequacy with Buffer to Risk Weighted Assets (percent) | 0.08500 | 0.08500
Tier One Risk Based Capital Required to be Well Capitalized | $ 301,385 | $ 303,375
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.0800 | 0.0800
Tier I leverage capital |  |
Tier One Leverage Capital | $ 521,209 | $ 458,467
Tier One Leverage Capital to Average Assets (percent) | 0.1073 | 0.0950
Tier One Leverage Capital Required for Capital Adequacy | $ 194,384 | $ 193,073
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 0.0400 | 0.0400
Tier One Leverage Capital Required to be Well Capitalized | $ 242,981 | $ 241,341
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 0.0500 | 0.0500

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