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FINANCIAL INSTRUMENTS WITH CONCENTRATIONS OF CREDIT RISK (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Loans receivable:    
Legal Lending Limit $ 24,356,000 $ 21,815,000
Legal Lending Limit, percent 15.00%  
Policy Lending Limit $ 18,267,000 16,361,000
Policy Lending Limit, percent 75.00%  
Gross loans prior to deferred costs and allowance for loan losses $ 919,149,000 822,076,000
Securities Available for sale:    
Gross Amortized Cost 553,737,000 466,356,000
Total Consumer Real Estate [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 403,900,000 $ 345,600,000
Total Consumer Real Estate [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 43.90% 42.00%
Commercial Real Estate [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 400,800,000  
Commercial Real Estate [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 43.60%  
Commercial Real Estate Agriculture Mortgages [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 22.20% 21.40%
NAICS Dairy Cattle and Milk Production Loans [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 93,800,000  
NAICS Dairy Cattle and Milk Production Loans [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 10.20%  
NAICS Non-Residential Real Estate Investment Loans [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 118,000,000.0  
NAICS Non-Residential Real Estate Investment Loans [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 12.80%  
Broilers and other chicken production loans [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 51,800,000  
Broilers and other chicken production loans [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 5.60%  
Total Commercial and Industrial [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 109,300,000  
Commercial and Industrial Tax Free Loans [Member]    
Loans receivable:    
Gross loans prior to deferred costs and allowance for loan losses $ 23,000,000.0  
Commercial and Industrial Tax Free Loans [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 2.50%  
Obligations of states and political subdivisions - State of Pennsylvania [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 20.30%  
Obligations of States and Political Subdivisions - State of Texas [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 17.40%  
Obligations of States and Political Subdivisions - States of Texas [Member] | Loan [Member] | Credit concentration risk [Member]    
Loans receivable:    
Concentration risk (as a percentage) 7.70%  
Corporate Bonds [Member]    
Securities Available for sale:    
Gross Amortized Cost $ 82,617,000 $ 60,387,000
Corporate Bonds [Member] | Domestic Issuers [Member]    
Securities Available for sale:    
Gross Amortized Cost 66,600,000  
Corporate Bonds [Member] | Foreign Issuers [Member]    
Securities Available for sale:    
Gross Amortized Cost 16,000,000.0  
Corporate Bonds [Member] | Non-Financial Commercial Paper [Member]    
Securities Available for sale:    
Gross Amortized Cost 30,000,000.0  
Corporate Bonds [Member] | Non-Financial Commercial Paper [Member] | Real Estate Companies [Member]    
Securities Available for sale:    
Gross Amortized Cost 2,000,000.0  
Corporate Bonds [Member] | Non-Financial Commercial Paper [Member] | Healthcare [Member]    
Securities Available for sale:    
Gross Amortized Cost 5,600,000  
Corporate Bonds [Member] | Financial and Brokerage Issuers [Member]    
Securities Available for sale:    
Gross Amortized Cost $ 52,600,000  
Concentration Risk Percentage, as compared to total corporate bond securities 63.70%  
Energy companies [Member] | Non-Financial Commercial Paper [Member] | Corporate Bonds [Member]    
Securities Available for sale:    
Gross Amortized Cost $ 8,000,000.0  
Corporate Bonds [Member] | Financial and Brokerage Issuers [Member]    
Securities Available for sale:    
Gross Amortized Cost 11,900,000  
Insurance Companies [Member] | Non-Financial Commercial Paper [Member] | Corporate Bonds [Member]    
Securities Available for sale:    
Gross Amortized Cost 5,200,000  
Biotechnology [Member] | Non-Financial Commercial Paper [Member] | Corporate Bonds [Member]    
Securities Available for sale:    
Gross Amortized Cost $ 9,200,000