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Investment Securities Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]      
Amortized cost $ 2,693,919    
Available-for-sale Securities, Fair Value Disclosure 2,758,597   $ 3,062,143
HTM, at amortized cost 853,413   278,281
HTM securities 843,743    
Proceeds from sales of AFS securities 59,342 $ 59,894  
Other securities losses (33,475) (46)  
Debt extinguishment costs 32,200    
Interest income 184,936 $ 199,378  
Debt extinguishment costs 841    
Unrealized Gain (Loss) on Securities (400)    
Visa      
Schedule of Investments [Line Items]      
Gain on sale of shares 34,000    
Residential Mortgage Backed Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 257,409    
Available-for-sale Securities, Fair Value Disclosure 255,364    
HTM, at amortized cost 467,461   278,281
HTM securities 475,739   296,857
US States and Political Subdivisions Debt Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 953,601    
Available-for-sale Securities, Fair Value Disclosure 994,760    
HTM, at amortized cost 376,200    
Auction Rate Securities [Member]      
Schedule of Investments [Line Items]      
Amortized cost 76,350    
Available-for-sale Securities, Fair Value Disclosure 76,204    
Proceeds from sales of AFS securities 24,600    
Collateral Pledged [Member]      
Schedule of Investments [Line Items]      
Securities pledged as collateral $ 1,100,000   $ 520,500