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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Held-to-maturity securities    
Amortized cost $ 3,400,000 $ 3,400,000
Estimated fair value 3,400,000 3,400,000
Carrying Value 3,400,000 3,400,000
Available-for-sale securities    
Amortized cost 4,254,960,000 3,054,289,000
Gross unrealized gains 17,197,000 35,832,000
Gross unrealized losses (58,237,000) (9,353,000)
Available for sale debt securities 4,213,920,000 3,080,768,000
Total Amortized cost 4,254,960,000 3,054,289,000
Available for sale debt securities and equity securities 4,213,920,000  
Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,213,920,000 3,080,768,000
Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities and equity securities 4,213,920,000 3,080,768,000
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized cost 4,213,441,000 3,006,592,000
Gross unrealized gains 14,159,000 32,701,000
Gross unrealized losses (58,237,000) (9,339,000)
Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 4,169,363,000 3,029,954,000
Residential mortgage-backed securities | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 4,169,363,000 3,029,954,000
US Government Corporations and Agencies Securities [Member]    
Available-for-sale securities    
Available for sale debt securities 824,474,000 371,407
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities    
Available for sale debt securities 3,344,889,000 2,658,247
States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities    
Amortized cost 41,519,000 47,697,000
Gross unrealized gains 3,038,000 3,131,000
Gross unrealized losses   (14,000)
States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 44,557,000 50,814,000
States and Political Subdivisions Debt Securities [Member] | Reported Value Measurement [Member]    
Available-for-sale securities    
Available for sale debt securities 44,557,000 50,814,000
Other Debt Obligations [Member]    
Held-to-maturity securities    
Amortized cost 3,400,000 3,400,000
Estimated fair value 3,400,000 3,400,000
Carrying Value $ 3,400,000 $ 3,400,000