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Investment Securities - Gross unrealized losses (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less Than 12 Months $ 2,558,000 $ 1,415,000
Total fair value 2,558,000 1,415,000
Unrealized (Losses)    
Less Than 12 Months (132,000)  
Total unrealized (losses) (132,000)  
Declines deemed to be other-than-temporary 0 0
FHLMC | Mortgage-Backed Securities    
Fair Value    
Less Than 12 Months 2,558,000 1,415,000
Total fair value 2,558,000 $ 1,415,000
Unrealized (Losses)    
Less Than 12 Months (132,000)  
Total unrealized (losses) $ (132,000)