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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Available for sale:    
Fair value, less than 12 months $ 1,672,076 $ 1,462,232
Unrealized losses, less than 12 Months (6,661) (9,339)
Fair value, 12 months or more 12,811 757
Unrealized losses, 12 Months or More (32) (14)
Fair value, Total 1,684,887 1,462,989
Unrealized losses, Total (6,693) (9,353)
Residential mortgage-backed securities    
Available for sale:    
Fair value, less than 12 months 1,672,076 1,462,232
Unrealized losses, less than 12 Months (6,661) (9,339)
Fair value, 12 months or more 12,275  
Unrealized losses, 12 Months or More (23)  
Fair value, Total 1,684,351 1,462,232
Unrealized losses, Total (6,684) (9,339)
States and political subdivisions    
Available for sale:    
Fair value, 12 months or more 536 757
Unrealized losses, 12 Months or More (9) (14)
Fair value, Total 536 757
Unrealized losses, Total $ (9) $ (14)