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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost      
Due in one year or less, held-to-maturity debt securities amortized cost $ 2,200,000    
Due after one year through five years, held-to-maturity debt securities amortized cost 1,200,000    
Amortized cost, held-to-maturity debt securities 3,400,000 $ 3,400,000  
Fair Value      
Due in one year or less, held-to-maturity debt securities, Estimated fair value 2,200,000    
Due after one year through five years, held-to-maturity debt securities, Estimated fair value 1,200,000    
Estimated fair value 3,400,000 3,400,000  
Available-for-sale debt securities amortized cost disclosures      
Due after ten years, available-for-sale debt securities amortized cost 41,519,000    
Residential mortgage-backed securities, amortized cost 4,213,441,000    
Amortized cost, Available-for-sale securities 4,254,960,000 3,054,289,000  
Available for sale debt securities, Estimated Fair Value Disclosures      
Due after ten years, available-for-sale debt securities, Estimated Fair Value 44,557,000    
Residential mortgage-backed securities, Estimated Fair Value 4,169,363,000    
Estimated fair value, Available for sale securities 4,213,920,000 3,080,768,000  
Available for sale debt securities, Estimated Fair Value Disclosures      
Proceeds from sales and calls of available for sale securities 5,890,000 42,350,000 $ 94,585,000
Proceeds from sales and calls of available for sale securities 5,890,000 42,350,000 94,585,000
Proceeds from sales of mortgage-backed securities 0 0 0
Gross gains realized on sales 0 1,000 3,000
Gross losses realized on sales 16,000 $ 6,000 $ 15,000
Collateral Pledged      
Available-for-sale debt securities amortized cost disclosures      
Amortized cost, Available-for-sale securities 1,519,652,000    
Available for sale debt securities, Estimated Fair Value Disclosures      
Fair value of available for sale investment securities pledged $ 1,497,929,000