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REGULATORY MATTERS: (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Corporation [Member] |  |
Capital [Abstract] |  |
Capital | $ 451,036 | $ 412,525
Capital to Risk Weighted Assets (percent) | 19.36% | 17.88%
Capital Required for Capital Adequacy | $ 230,091 | $ 213,446
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 9.875% | 9.25%
Common equity capital | $ 430,600 | $ 392,615
Commen Equity Capital to Risk Weighted Assets | 18.48% | 17.01%
Common equity capital required for capital adequacy | $ 148,540 | $ 132,682
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 6.375% | 5.75%
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 430,600 | $ 392,615
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 18.48% | 17.01%
Tier One Risk Based Capital Required for Capital Adequacy | $ 183,490 | $ 167,295
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 7.875% | 7.25%
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 430,600 | $ 392,615
Tier One Leverage Capital to Average Assets (percent) | 14.59% | 13.31%
Tier One Leverage Capital Required for Capital Adequacy | $ 118,072 | $ 117,956
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 4.00% | 4.00%
First Financial Bank [Member] |  |
Capital [Abstract] |  |
Capital | $ 421,553 | $ 386,593
Capital to Risk Weighted Assets (percent) | 18.71% | 17.30%
Capital Required for Capital Adequacy | $ 222,453 | $ 206,745
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 9.875% | 9.25%
Capital Required to be Well Capitalized | $ 225,268 | $ 223,508
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 10.00% | 10.00%
Common equity capital | $ 405,181 | $ 370,061
Commen Equity Capital to Risk Weighted Assets | 17.99% | 16.56%
Common equity capital required for capital adequacy | $ 143,609 | $ 128,517
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 6.375% | 5.75%
Common equity capital required to be well capitalized | $ 146,424 | $ 145,280
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 | $ 405,181 | $ 370,061
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 17.99% | 16.56%
Tier One Risk Based Capital Required for Capital Adequacy | $ 177,399 | $ 162,044
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 7.875% | 7.25%
Tier One Risk Based Capital Required to be Well Capitalized | $ 180,215 | $ 178,807
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 | $ 405,181 | $ 370,061
Tier One Leverage Capital to Average Assets (percent) | 14.19% | 12.81%
Tier One Leverage Capital Required for Capital Adequacy | $ 114,213 | $ 115,553
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 | $ 142,767 | $ 144,441
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 5.00% | 5.00%

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