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Commitments and Contingencies - Textuals (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2035
Dec. 31, 2023
Dec. 31, 2022
Other Commitments [Line Items]            
Investments in Affordable Housing Limited Entities $ 116,300,000 $ 96,400,000        
Affordable Housing Tax Credits and Other Tax Benefits, Amount 11,400,000 7,500,000 $ 5,700,000      
Amortization Method Qualified Affordable Housing Project Investments, Amortization 9,700,000 6,500,000 5,000,000      
Qualified Affordable Housing Project Investments, Commitment 41,500,000 53,800,000        
Impairment losses on LIHTC investments 0 0 0      
Carrying value of NMTC 9,800,000 25,200,000        
Investment income $ 247,000 $ 694,000 $ 701,000      
Forecast            
Other Commitments [Line Items]            
Qualified Affordable Housing Project Investments, Future Commitment       $ 7,300,000 $ 23,600,000 $ 10,600,000