Quarterly report pursuant to Section 13 or 15(d)

Available-for-Sale Securities, Weighted Average Life Classifications (Details)

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Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year $ 1,216  
Greater than 1 year and less than or equal to 3 years 56,417  
Greater than 3 years and less than or equal to 5 years 324,233  
Greater than 5 years and less than or equal to 10 years 6,587,924  
Greater than 10 years 928  
Available-for-sale securities, at fair value 6,970,718 $ 7,161,703
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 1,216  
Greater than 1 year and less than or equal to 3 years 55,273  
Greater than 3 years and less than or equal to 5 years 322,925  
Greater than 5 years and less than or equal to 10 years 6,577,846  
Greater than 10 years 928  
Available-for-sale securities, at fair value 6,958,188 7,149,399
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 0  
Greater than 1 year and less than or equal to 3 years 1,144  
Greater than 3 years and less than or equal to 5 years 1,308  
Greater than 5 years and less than or equal to 10 years 10,078  
Greater than 10 years 0  
Available-for-sale securities, at fair value $ 12,530 $ 12,304