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EMPLOYEE BENEFIT PLANS, Noncontributory Defined Benefit Pension Plan Fair Value of Plan Assets (Details) - Pension Plan [Member] - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 13,247,000 $ 13,277,000 $ 18,212,000
Allocation 100.00% 100.00%  
Expected employer contribution to pension plan $ 0    
Expected future benefit payments [Abstract]      
2021 1,048,000    
2022 570,000    
2023 639,000    
2024 809,000    
2025 1,199,000    
2026 - 2030 5,146,000    
Level I [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 10,575,000 $ 10,183,000  
Level II [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 2,672,000 3,094,000  
Level III [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Cash and Cash Equivalents [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 456,000 $ 924,000  
Allocation 3.40% 7.00%  
Cash and Cash Equivalents [Member] | Level I [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 456,000 $ 924,000  
Cash and Cash Equivalents [Member] | Level II [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Cash and Cash Equivalents [Member] | Level III [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Equity Securities [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 5,709,000 $ 5,084,000  
Allocation 43.10% 38.30%  
Equity Securities [Member] | Minimum [Member]      
Target Allocations of Assets [Abstract]      
Target plan asset allocations 50.00%    
Equity Securities [Member] | Maximum [Member]      
Target Allocations of Assets [Abstract]      
Target plan asset allocations 70.00%    
Equity Securities [Member] | Level I [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 5,709,000 $ 5,084,000  
Equity Securities [Member] | Level II [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Equity Securities [Member] | Level III [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Mutual Funds and ETF's [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 4,410,000 $ 4,175,000  
Allocation 33.30% 31.40%  
Mutual Funds and ETF's [Member] | Level I [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 4,410,000 $ 4,175,000  
Mutual Funds and ETF's [Member] | Level II [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Mutual Funds and ETF's [Member] | Level III [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Corporate Bonds [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 2,672,000 $ 3,094,000  
Allocation 20.20% 23.30%  
Corporate Bonds [Member] | Minimum [Member]      
Target Allocations of Assets [Abstract]      
Target plan asset allocations 30.00%    
Corporate Bonds [Member] | Maximum [Member]      
Target Allocations of Assets [Abstract]      
Target plan asset allocations 50.00%    
Corporate Bonds [Member] | Level I [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 0 $ 0  
Corporate Bonds [Member] | Level II [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 2,672,000 3,094,000  
Corporate Bonds [Member] | Level III [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets 0 0  
Common Stock [Member]      
Plan assets at fair value [Abstract]      
Fair value of plan assets $ 627,000 $ 681,000  
Allocation 4.70% 5.10%