XML 51 R41.htm IDEA: XBRL DOCUMENT v3.23.1
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Amortized Cost      
Due in one year or less, held-to-maturity debt securities amortized cost $ 1,075,000    
Due after one year through five years, held-to-maturity debt securities amortized cost 2,325,000    
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 1,075,000    
Due after one year through five years, held-to-maturity debt securities, Estimated fair value 2,325,000    
Estimated fair value 3,400,000   3,400,000
Available-for-sale debt securities amortized cost disclosures      
Due in one year or less, available-for-sale debt securities amortized cost 49,967,000    
Due after five years through ten years, available-for-sale debt securities amortized cost 440,000    
Due after ten years, available-for-sale debt securities amortized cost 162,507,000    
Residential mortgage-backed securities, amortized cost 5,184,217,000    
Amortized cost, Available for sale securities 5,397,131,000   $ 5,018,996,000
Available for sale debt securities, Estimated Fair Value Disclosures      
Due in one year or less, available-for-sale debt securities, Estimated Fair Value 49,925,000    
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value 440,000    
Due after ten years, available-for-sale debt securities, Estimated Fair Value 162,224,000    
Residential mortgage-backed securities, Estimated Fair Value 4,647,229,000    
Available for sale debt securities, Estimated Fair Value Disclosures      
Proceeds from sales and calls of available for sale securities 450,000 $ 0  
Proceeds from sales of mortgage-backed securities 0 0  
Gross gains realized on sales 0 0  
Gross losses realized on sales 0 $ 0  
Collateral Pledged      
Available for sale debt securities, Estimated Fair Value Disclosures      
Fair value of available for sale investment securities pledged $ 1,249,080,000