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REGULATORY MATTERS: (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Corporation [Member] |  |
Capital [Abstract] |  |
Capital | $ 398,903 | $ 386,622
Capital to Risk Weighted Assets (percent) | 18.62% | 17.86%
Capital Required for Capital Adequacy | $ 171,346 | $ 173,211
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 8.00% | 8.00%
Common equity capital | $ 378,957 |
Commen Equity Capital to Risk Weighted Assets | 17.69% |
Common equity capital required for capital adequacy | $ 96,382 |
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 4.50% |
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 378,957 | $ 367,783
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 17.69% | 16.99%
Tier One Risk Based Capital Required for Capital Adequacy | $ 128,509 | $ 129,908
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 6.00% | 6.00%
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 378,957 | $ 367,783
Tier One Leverage Capital to Average Assets (percent) | 12.92% | 12.33%
Tier One Leverage Capital Required for Capital Adequacy | $ 117,352 | $ 119,356
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (percent) | 4.00% | 4.00%
First Financial Bank [Member] |  |
Capital [Abstract] |  |
Capital | $ 372,922 | $ 358,631
Capital to Risk Weighted Assets (percent) | 18.05% | 17.13%
Capital Required for Capital Adequacy | $ 165,261 | $ 167,472
Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 8.00% | 8.00%
Capital Required to be Well Capitalized | $ 206,576 | $ 209,340
Capital Required to be Well Capitalized to Risk Weighted Assets (percent) | 10.00% | 10.00%
Common equity capital | $ 355,853 |
Commen Equity Capital to Risk Weighted Assets | 17.23% |
Common equity capital required for capital adequacy | $ 92,959 |
Common Equity Capital required for Capital Adequacy to Risk Weighted Assets | 4.50% |
Common equity capital required to be well capitalized | $ 134,274 |
Common Equity Capital required to be Well Capitalized to Risk Weighted Assets | 6.50% |
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 355,853 | $ 342,452
Tier One Risk Based Capital to Risk Weighted Assets (percent) | 17.23% | 16.36%
Tier One Risk Based Capital Required for Capital Adequacy | $ 123,945 | $ 125,604
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (percent) | 6.00% | 6.00%
Tier One Risk Based Capital Required to be Well Capitalized | $ 165,261 | $ 167,472
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 | $ 355,853 | $ 342,452
Tier One Leverage Capital to Average Assets (percent) | 12.50% | 11.83%
Tier One Leverage Capital Required for Capital Adequacy | $ 113,888 | $ 115,770
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 | $ 142,360 | $ 144,712
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (percent) | 5.00% | 5.00%

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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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