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Junior Subordinated Deferrable Interest Debentures (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Junior subordinated interest deferrable debentures, major types of business trusts    
Number of statutory business trusts issuing trust preferred securities | item 5  
Junior subordinated deferrable interest debentures | $ $ 134,642,000 $ 134,642,000
Maximum number of consecutive quarterly period available for deferral of interest payment on Trusts VIII, IX, X, XI and XII | item 20  
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum 25.00%  
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum 25.00%  
Capital securities issued by the trust, qualifying as Tier I capital | $ $ 134,642,000 $ 134,642,000