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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale    
Less than 12 months Fair Value $ 15,393,537 $ 890,461
Less than 12 months Gross Unrealized Losses 273,007 1,877
12 months or more Fair Value 596,135 555
12 months or more Gross Unrealized Losses 25,341 11
Total Fair Value 15,989,672 891,016
Total Gross Unrealized Losses 298,348 1,888
US Treasury Securities    
Debt Securities, Available-for-sale    
Less than 12 months Fair Value 9,590,448  
Less than 12 months Gross Unrealized Losses 102,059  
12 months or more Fair Value 0  
12 months or more Gross Unrealized Losses 0  
Total Fair Value 9,590,448  
Total Gross Unrealized Losses 102,059  
Collateralized Mortgage Obligations - Federal agencies    
Debt Securities, Available-for-sale    
Less than 12 months Fair Value 35,533 4,029
Less than 12 months Gross Unrealized Losses 334 43
12 months or more Fair Value 1,084 0
12 months or more Gross Unrealized Losses 29 0
Total Fair Value 36,617 4,029
Total Gross Unrealized Losses 363 43
Mortgage Backed Securities    
Debt Securities, Available-for-sale    
Less than 12 months Fair Value 5,767,556 886,432
Less than 12 months Gross Unrealized Losses 170,614 1,834
12 months or more Fair Value 595,051 555
12 months or more Gross Unrealized Losses 25,312 11
Total Fair Value 6,362,607 886,987
Total Gross Unrealized Losses $ 195,926 $ 1,845