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REGULATORY MATTERS - Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Corporation [Member] |  |
Capital [Abstract] |  |
Capital | $ 561,347 | $ 533,599
Capital to Risk Weighted Assets (percent) | 0.1461 | 0.1563
Capital Required for Capital Adequacy | $ 403,400 | $ 358,575
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.10500 | 0.10500
Common equity capital | $ 521,568 | $ 490,842
Common Equity Capital to Risk Weighted Assets | 0.1358% | 0.1437%
Common equity capital required for capital adequacy | $ 268,933 | $ 239,050
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 521,568 | $ 490,842
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1358 | 0.1437
Tier One Risk Based Capital Required for Capital Adequacy | $ 326,562 | $ 290,275
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.08500 | 0.08500
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 521,568 | $ 490,842
Tier One Leverage Capital to Average Assets (percent) | 0.1078 | 0.0983
Tier One Leverage Capital Required for Capital Adequacy | $ 193,476 | $ 199,702
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 0.0400 | 0.0400
First Financial Bank |  |
Capital [Abstract] |  |
Capital | $ 498,246 | $ 487,416
Capital to Risk Weighted Assets (percent) | 0.1314 | 0.1478
Capital Required for Capital Adequacy | $ 398,179 | $ 346,248
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.10500 | 0.10500
Capital Required to be Well Capitalized | $ 379,219 | $ 329,760
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.1000 | 0.1000
Common equity capital | $ 458,467 | $ 446,189
Common Equity Capital to Risk Weighted Assets | 0.1209% | 0.1353%
Common equity capital required for capital adequacy | $ 265,453 | $ 230,832
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Common equity capital required to be well capitalized | $ 246,492 | $ 214,344
Common Equity Capital required to be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 458,467 | $ 446,189
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1209 | 0.1353
Tier One Risk Based Capital Required for Capital Adequacy with Buffer | $ 322,336 | $ 280,296
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 | $ 303,375 | $ 263,808
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.0800 | 0.0800
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 458,467 | $ 446,189
Tier One Leverage Capital to Average Assets (percent) | 0.0950 | 0.0918
Tier One Leverage Capital Required for Capital Adequacy | $ 193,073 | $ 194,405
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 | $ 241,341 | $ 243,006
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 0.0500 | 0.0500

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