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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
Oct. 01, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Number of insurance-related subsidiaries | item       1      
Investment Securities              
Number of components in which other-than-temporary impairment is segregated | item       2      
Non-Accrual Loans              
Period of charge off for past due unsecured consumer loans       90 days      
Minimum period that past due unsecured loans outstanding may not be placed on nonaccrual status under special circumstances       90 days      
Maximum period of non-consumer loans outstanding that is used to evaluate whether loans should be placed on non-accrual status       90 days      
Other Real Estate Owned and Repossessed Assets              
Other real estate owned       $ 60,487,300 $ 71,103,000    
Repossessed assets         7,137,000    
Income Taxes              
Percentage of likelihood of realization of recognized tax benefit       50.00%      
Liability for unrecognized tax benefits       $ 0 0    
Interest expense related to uncertain tax positions       0 0 $ 0  
Penalties related to uncertain tax positions       0 0 $ 0  
Goodwill and Identified Intangible Assets              
Goodwill impairment loss   $ 0          
Impairment of identified intangible assets       $ 0      
Segments of an Enterprise and Related Information              
Number of operating segments | item       1      
Number of active operating bank subsidiaries | item       5      
New Accounting Standards              
One-time reclassification from AOCI to retained earnings, relating to the Tax Cuts and Jobs Act of 2017     $ 5,997,000        
Right-of-use asset amortization       $ 1,357,000 1,019,000    
Retained Earnings (Accumulated Deficit)       $ 2,289,626,000 $ 2,200,568,000    
ASU 2016-02              
New Accounting Standards              
Right of use asset, statement of Financial Position Location             us-gaap:OtherAssets
Lease liability, statement of Financial Position Location             us-gaap:OtherLiabilities
ASU 2016-02 | Adjusted Balance              
New Accounting Standards              
Right of use asset             $ 6,400,000
Lease liability             $ 6,400,000
ASU 2016-13 | Adjustment              
New Accounting Standards              
Percentage of Increase in Allowance for Loan Losses 17.20%            
Retained Earnings (Accumulated Deficit) $ 8,300,000