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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
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 4,796,527 4,254,960
Available for sale debt securities 4,215,390 4,213,920
Total Amortized cost 4,796,527 4,254,960
Total Gross unrealized gains 54 17,197
Total Gross unrealized losses 581,191 58,237
Estimated Fair Value    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,215,390 4,213,920
Reported Value Measurement    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,215,390 4,213,920
US Treasury Securities    
Available-for-sale securities    
Amortized cost 49,533  
Gross unrealized losses (541)  
US Treasury Securities | Estimated Fair Value    
Available-for-sale securities    
Available for sale debt securities 48,992  
US Treasury Securities | Reported Value Measurement    
Available-for-sale securities    
Available for sale debt securities 48,992  
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost 4,636,564 4,213,441
Gross unrealized gains 3 14,159
Gross unrealized losses (573,278) (58,237)
Residential mortgage-backed securities | Estimated Fair Value    
Available-for-sale securities    
Available for sale debt securities 4,063,289 4,169,363
Residential mortgage-backed securities | Reported Value Measurement    
Available-for-sale securities    
Available for sale debt securities 4,063,289 4,169,363
US Government Corporations and Agencies Securities [Member]    
Available-for-sale securities    
Available for sale debt securities 600,731 824,474
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities    
Available for sale debt securities 3,462,558 3,344,899
States and political subdivisions    
Available-for-sale securities    
Amortized cost 110,430 41,519
Gross unrealized gains 51 3,038
Gross unrealized losses (7,372)  
States and political subdivisions | Estimated Fair Value    
Available-for-sale securities    
Available for sale debt securities 103,109 44,557
States and political subdivisions | Reported Value Measurement    
Available-for-sale securities    
Available for sale debt securities 103,109 44,557
Other Debt Obligations    
Held-to-maturity securities    
Amortized cost 3,400 3,400
Estimated fair value 3,400 3,400
Carrying Value $ 3,400 $ 3,400