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BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES: (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
branch
subsidiary
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]      
Number of investment subsidiaries (subsidiary) | subsidiary 2    
Transfer to other real estate | $ $ 43 $ 567 $ 458
Repayment of deferred fees and interest in years 10 years    
Expenses for deferred compensation | $ $ 117 111 109
Deferred compensation liability, current | $ $ 1,300    
Incentive award, payment period 15 years    
Compensation liability | $ $ 6,000 6,800  
Vesting period 3 years    
Officers' compensation expense | $ $ 2,300 2,200 1,900
Deferred compensation liablity incentive plan | $ $ 1,800 1,400  
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 3    
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    
Daviess 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) 3    
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) 3    
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) 2    
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) 1    
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) 2    
Richland County, Illinois      
Property, Plant and Equipment [Line Items]      
Number of branches entity operates (branches) 1    
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 | $ $ 910,100    
Service fees      
Property, Plant and Equipment [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax | $ $ 1,300 $ 1,300 $ 1,300