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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Held-to-maturity securities    
Amortized cost $ 3,400 $ 3,400
Estimated fair value 3,400 3,400
Carrying Value 3,400 3,400
Available-for-sale securities    
Amortized cost 4,148,673 3,054,289
Available for sale debt securities 4,171,881 3,080,768
Total Amortized cost 4,148,673 3,054,289
Total Gross unrealized gains 29,901 35,832
Total Gross unrealized losses 6,693 9,353
Estimate of Fair Value Measurement    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,171,881 3,080,768
Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,171,881 3,080,768
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost 4,103,989 3,006,592
Gross unrealized gains 26,331 32,701
Gross unrealized losses (6,684) (9,339)
Residential mortgage-backed securities | Estimate of Fair Value Measurement    
Available-for-sale securities    
Available for sale debt securities 4,123,636 3,029,954
Residential mortgage-backed securities | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 4,123,636 3,029,954
US Government Corporations and Agencies Securities [Member]    
Available-for-sale securities    
Available for sale debt securities 917,895 371,407
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities    
Available for sale debt securities 3,205,741 2,658,547
States and political subdivisions    
Available-for-sale securities    
Amortized cost 44,684 47,697
Gross unrealized gains 3,570 3,131
Gross unrealized losses (9) (14)
States and political subdivisions | Estimate of Fair Value Measurement    
Available-for-sale securities    
Available for sale debt securities 48,245 50,814
States and political subdivisions | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 48,245 50,814
Other Debt Obligations [Member]    
Held-to-maturity securities    
Amortized cost 3,400 3,400
Estimated fair value 3,400 3,400
Carrying Value $ 3,400 $ 3,400