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Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 14, 2021
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
May 31, 2011
Debt Instrument [Line Items]          
Redeemed debt instrument on puttable notice     $ (10)    
5.875% Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, term     10 years    
Face value of debt       $ 24,200 $ 100,000
Debt instrument, interest rate   5.875% 5.875% 5.875% 5.875%
Debt instrument, maturity date     Jun. 01, 2021    
Subordinated Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, term     2 years    
Face value of debt $ 52,200 $ 52,200 $ 52,200    
Dividends declared related to issuance of debt (in dollars per share)   $ 2.00 $ 2.00    
Debt instrument reserved to be issued upon vesting of RSA's $ 1,900        
Debt instrument, interest rate for period ending June 15, 2022 4.00%        
Debt instrument, interest rate for period ending June 15, 2023 5.00%        
Debt instrument, maturity date     Jun. 15, 2023    
Percentage of redemption price 100.00%        
Redeemed debt instrument on puttable notice   $ (10)      
Debt instrument outstanding   52,100 $ 52,100    
Subordinated Notes [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Notice period of redemption     60 days    
Subordinated Notes [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Notice period of redemption     90 days    
Subordinated Notes [Member] | Computershare Trust Company, N.A. [Member]          
Debt Instrument [Line Items]          
Debt instrument, term     2 years    
Subordinated Notes [Member] | Computershare Trust Company, N.A. [Member] | Class A [Member]          
Debt Instrument [Line Items]          
Dividends declared related to issuance of debt (in dollars per share) $ 2.00        
Subordinated Notes [Member] | Computershare Trust Company, N.A. [Member] | Class B [Member]          
Debt Instrument [Line Items]          
Dividends declared related to issuance of debt (in dollars per share) $ 2.00        
Subordinated Notes [Member] | Computershare Trust Company, N.A. [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Face value of debt $ 54,000        
Subordinated Notes [Member] | New Subordinated Debt [Member]          
Debt Instrument [Line Items]          
Face value of debt   $ 22 $ 22