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REGULATORY MATTERS - Regulatory Capital Requirements under Banking Regulations (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
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