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BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES: (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
branch
subsidiary
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]      
Number of investment subsidiaries (subsidiary) | subsidiary 2    
Transfer to other real estate | $ $ 600 $ 500 $ 600
Repayment of deferred fees and interest in years 10 years    
Expenses for deferred compensation | $ $ 111 109 98
Deferred compensation liability, current | $ $ 1,500    
Payment of incentive rewards 15 years    
Compensation liability | $ $ 6,800 7,600  
Vesting period 3 years    
Officers' compensation expense | $ $ 2,200 1,900 1,700
Deferred compensation liablity incentive plan | $ $ 1,400 1,000  
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) 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 | $ $ 747,900    
Service fees      
Property, Plant and Equipment [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax | $ $ 1,300 $ 1,300 $ 1,300