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RETIREMENT PLANS (Narrative) (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
person
Dec. 31, 2020
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
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 346  
Actuarial gain (loss), mortality assumptions $ (1,509,000) $ (3,699,000)
Corporation common stock included in equity securities, percentage of total plan assets 5.00% 4.00%
Employee contribution percentage, maximum 100.00%  
Additional compensation contributed to plan 50.00%  
Percentage over employees' gross pay 2.00%  
Balance accrued included in other liabilities $ 3,768,000 $ 3,491,000
Annual expense included in salaries and benefits expense $ 505,000 524,000
Banking Subsidiary    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer Match Percentage of Income 3.00%  
Employer Contributions to and Expenses for the Plan $ 921,000 887,000
Insurance Subsidiary    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer Contributions to and Expenses for the Plan $ 124,000 126,000
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%  
Corporation common stock    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair value of plan assets $ 2,543,000 $ 1,963,000