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REGULATORY MATTERS: (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Corporation [Member] |  |
Capital [Abstract] |  |
Capital | $ 533,599 | $ 538,440
Capital to Risk Weighted Assets (percent) | 0.1563 | 0.1740
Capital Required for Capital Adequacy | $ 358,575 | $ 324,849
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.10500 | 0.10500
Common equity capital | $ 490,842 | $ 499,664
Commen Equity Capital to Risk Weighted Assets | 14.37% | 16.15%
Common equity capital required for capital adequacy | $ 239,050 | $ 216,566
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 | $ 490,842 | $ 499,664
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1437 | 0.1615
Tier One Risk Based Capital Required for Capital Adequacy | $ 290,275 | $ 262,973
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 | $ 490,842 | $ 499,664
Tier One Leverage Capital to Average Assets (percent) | 0.0983 | 0.1124
Tier One Leverage Capital Required for Capital Adequacy | $ 199,702 | $ 177,781
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 0.0400 | 0.0400
First Financial Bank [Member] |  |
Capital [Abstract] |  |
Capital | $ 487,416 | $ 507,869
Capital to Risk Weighted Assets (percent) | 0.1478 | 0.1703
Capital Required for Capital Adequacy | $ 346,248 | $ 313,075
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.10500 | 0.10500
Capital Required to be Well Capitalized | $ 329,760 | $ 298,166
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 0.1000 | 0.1000
Common equity capital | $ 446,189 | $ 470,551
Commen Equity Capital to Risk Weighted Assets | 13.53% | 15.78%
Common equity capital required for capital adequacy | $ 230,832 | $ 208,716
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Common equity capital required to be well capitalized | $ 214,344 | $ 193,808
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 | $ 446,189 | $ 470,551
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 0.1353 | 0.1578
Tier One Risk Based Capital Required for Capital Adequacy | $ 280,296 | $ 253,441
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 0.08500 | 0.08500
Tier One Risk Based Capital Required to be Well Capitalized | $ 263,808 | $ 238,533
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 | $ 446,189 | $ 470,551
Tier One Leverage Capital to Average Assets (percent) | 0.0918 | 0.1090
Tier One Leverage Capital Required for Capital Adequacy | $ 194,405 | $ 172,728
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 | $ 243,006 | $ 215,910
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 0.0500 | 0.0500

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