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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($)
$ in Thousands
Jun. 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 4,648,031 4,254,960
Available for sale debt securities 4,294,360 4,213,920
Total Amortized cost 4,648,031 4,254,960
Total Gross unrealized gains 684 17,197
Total Gross unrealized losses 354,355 58,237
Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,294,360 4,213,920
Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,294,360 4,213,920
US Treasury Securities [Member]    
Available-for-sale securities    
Amortized cost 49,314  
Gross unrealized losses (363)  
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 48,951  
US Treasury Securities [Member] | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 48,951  
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost 4,557,327 4,213,441
Gross unrealized gains 423 14,159
Gross unrealized losses (353,819) (58,237)
Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 4,203,931 4,169,363
Residential mortgage-backed securities | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 4,203,931 4,169,363
US Government Corporations and Agencies Securities [Member]    
Available-for-sale securities    
Available for sale debt securities 680,229 824,474
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities    
Available for sale debt securities 3,523,702 3,344,899
States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities    
Amortized cost 41,390 41,519
Gross unrealized gains 261 3,038
Gross unrealized losses (173)  
States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 41,478 44,557
States and Political Subdivisions Debt Securities [Member] | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 41,478 44,557
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