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BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES: (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) subsidiary branch | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of investment subsidiaries (subsidiary) | subsidiary | 2 |  |
Transfer to other real estate | $ | $ 458 | $ 600 | $ 900
Repayment of deferred fees and interest in years | 10 years |  |
Expenses for deferred compensation | $ | $ 109 | 98 | 95
Deferred compensation liability, current | $ | $ 1,700 | 2,600 |
Payment of incentive rewards | 15 years |  |
Compensation liability | $ | $ 7,600 | 8,500 |
Vesting period | 3 years |  |
Officers' compensation expense | $ | $ 1,900 | 1,700 | 1,600
Deferred compensation liablity incentive plan | $ | $ 1,030 | 899 |
Income tax examination, description | The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. |  |
Likelihood of unfavorable settlement (percent) | 50.00% |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-lived intangible asset, useful life | 10 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-lived intangible asset, useful life | 12 years |  |
Furniture and Fixtures | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | P3Y |  |
Furniture and Fixtures | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 5 |  |
Buildings And Leasehold Improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 33 |  |
Buildings And Leasehold Improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, estimated useful lives | 39 |  |
Vigo County |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 11 |  |
Daviess County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Gibson County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Greene County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Putnam County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Sullivan County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 4 |  |
Vanderburgh County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Vermillion County, Indiana |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 4 |  |
Clark County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Coles County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 3 |  |
Crawford County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Franklin County, Illinois [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Jasper County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Lawrence County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
Livingston County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Marion County, Illinois [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
McLean County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 3 |  |
Richland County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 2 |  |
Wayne County, Illinois |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of branches entity operates (branches) | 1 |  |
First Financial Bank [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Investments in subsidiaries | $ | $ 784,400 |  |
Service fees |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ | $ 1,300 | $ 1,300 | $ 1,300

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