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Borrowing Arrangements - Line of Credit with a Corresponding Bank (Details) - Parent Company - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Line of credit | Maximum    
Borrowing Arrangements    
Line of credit $ 20,000,000  
Line of credit | Minimum    
Borrowing Arrangements    
Line of credit 10,000,000  
Line of credit    
Borrowing Arrangements    
Line of credit 20,000,000 $ 10,000,000
Amount outstanding $ 0  
Amount outstanding   $ 0