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Related Party Transactions - Split Dollar Agreements - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Chairman, Board of Directors          
Related Party Transaction [Line Items]          
Payments for life insurance policies $ 600,000 $ 600,000 $ 1,100,000 $ 1,100,000  
Chief Executive Officer          
Related Party Transaction [Line Items]          
Payments for life insurance policies 0 $ 0 700,000 $ 700,000  
Executive Officers          
Related Party Transaction [Line Items]          
Life insurance assets, carrying amount $ 24,000,000   $ 24,000,000   $ 22,200,000