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RETIREMENT PLANS (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
person
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated Benefit Obligation $ 30,228 $ 27,508  
Corporation Common Stock Included in Equity Securities $ 2,114 $ 2,175  
Corporation Common Stock Included in Equity Securities, Percentage of Total Plan Assets 5.00% 6.00%  
Percentage of participants average monthly pay used to calculate benefit accruals 0.75%    
Maximum years of benefit used to calculate benefit accruals 25 years    
Number of active, vested terminated, and retired persons in the Plan | person 353    
Employee contribution percentage, maximum 100.00%    
Balance accrued included in other liabilities $ 2,803 $ 2,550  
Annual expense included in salaries and benefits expense $ 279 383 $ 360
Banking Subsidiary      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer Match Percentage of Income 4.00%    
Employer Contributions to and Expenses for the Plan $ 626 541 547
Insurance Subsidiary      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer Contributions to and Expenses for the Plan $ 86 $ 83 $ 74
Non highly compensated employees | Insurance Subsidiary      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer Match Percentage of Income 6.00%    
Highly Compensated Employees | Insurance Subsidiary      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer Match Percentage of Income 3.00%