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REGULATORY MATTERS: (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Corporation [Member] |  |
Capital [Abstract] |  |
Capital | $ 495,817 | $ 451,036
Capital to Risk Weighted Assets (percent) | 16.16% | 19.36%
Capital Required for Capital Adequacy | $ 322,091 | $ 230,091
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 10.50% | 9.875%
Common equity capital | $ 475,874 | $ 430,600
Commen Equity Capital to Risk Weighted Assets | 15.51% | 18.48%
Common equity capital required for capital adequacy | $ 214,728 | $ 148,540
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 6.375%
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 475,874 | $ 430,600
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 15.51% | 18.48%
Tier One Risk Based Capital Required for Capital Adequacy | $ 260,741 | $ 183,490
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 8.50% | 7.875%
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 475,874 | $ 430,600
Tier One Leverage Capital to Average Assets (percent) | 12.04% | 14.59%
Tier One Leverage Capital Required for Capital Adequacy | $ 158,081 | $ 118,072
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 4.00% | 4.00%
First Financial Bank [Member] |  |
Capital [Abstract] |  |
Capital | $ 472,995 | $ 421,553
Capital to Risk Weighted Assets (percent) | 15.91% | 18.71%
Capital Required for Capital Adequacy | $ 312,111 | $ 222,453
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 10.50% | 9.875%
Capital Required to be Well Capitalized | $ 297,249 | $ 225,268
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 10.00% | 10.00%
Common equity capital | $ 457,649 | $ 405,181
Commen Equity Capital to Risk Weighted Assets | 15.40% | 17.99%
Common equity capital required for capital adequacy | $ 208,074 | $ 143,609
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 7.00% | 6.375%
Common equity capital required to be well capitalized | $ 193,212 | $ 146,424
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 | $ 457,649 | $ 405,181
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 15.40% | 17.99%
Tier One Risk Based Capital Required for Capital Adequacy | $ 252,661 | $ 177,399
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 8.50% | 7.875%
Tier One Risk Based Capital Required to be Well Capitalized | $ 237,799 | $ 180,215
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 8.00% | 8.00%
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 457,649 | $ 405,181
Tier One Leverage Capital to Average Assets (percent) | 11.93% | 14.19%
Tier One Leverage Capital Required for Capital Adequacy | $ 153,453 | $ 114,213
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 4.00% | 4.00%
Tier One Leverage Capital Required to be Well Capitalized | $ 191,816 | $ 142,767
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 5.00% | 5.00%

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