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Long Term Subordinated Notes (Narrative) (Details) - Item
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
May 15, 2022
Senior Notes 4.868% [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 4.868%    
Maturity date Jun. 01, 2044 Jun. 01, 2044  
Subordinated Notes 6.60% [Member] | Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 6.60%    
Interest payment commencement date Nov. 15, 2007    
Right to defer interest, number of occasions 1    
Right to defer interest on one or more occasions for up to number of consecutive years 10 years    
Interest basis, 3 month LIBOR plus number of basis points, reset quarterly 2.385%    
Percentage of principal amount required for redemption 100.00%    
Maturity date May 01, 2067 May 01, 2067  
Subordinated Notes 6.60% [Member] | Subordinated Debt [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Reset quarterly interest rate     2.89%
Subordinated Notes 6.60% [Member] | Subordinated Debt [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Interest payment date May 3, 2007    
Redemption date May 15, 2017    
Subordinated Notes 6.60% [Member] | Subordinated Debt [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Interest payment date May 14, 2017    
Redemption date May 01, 2047