v3.25.2
Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Contractual Maturities and Estimated Fair Values (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Amortized Cost          
Due in one year or less, held-to-maturity debt securities amortized cost $ 3,200,000   $ 3,200,000    
Due after one year through five years, held-to-maturity debt securities amortized cost 1,200,000   1,200,000    
Amortized cost, held-to-maturity debt securities 4,400,000   4,400,000   $ 4,400,000
Fair Value          
Due in one year or less, held-to-maturity debt securities, Estimated fair value 3,200,000   3,200,000    
Due after one year through five years, held-to-maturity debt securities, Estimated fair value 1,200,000   1,200,000    
Estimated fair value 4,400,000   4,400,000   4,400,000
Available-for-sale debt securities amortized cost disclosures          
Due after five years through ten years, available-for-sale debt securities amortized cost 2,240,000   2,240,000    
Due after ten years, available-for-sale debt securities amortized cost 150,190,000   150,190,000    
Residential mortgage-backed securities, available-for-sale debt securities amortized cost 5,245,239,000   5,245,239,000    
Amortized cost, Available-for-sale securities 5,397,669,000   5,397,669,000   5,472,310,000
Available for sale debt securities, Estimated Fair Value Disclosures          
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value 2,238,000   2,238,000    
Due after ten years, available-for-sale debt securities, Estimated Fair Value 138,527,000   138,527,000    
Residential mortgage-backed securities, available-for-sale debt securities, Estimated Fair Value 4,869,078,000   4,869,078,000    
Estimated fair value, Available for sale securities 5,009,843,000   5,009,843,000   $ 4,987,916,000
Available for sale debt securities, Estimated Fair Value Disclosures          
Proceeds from sales and calls of available for sale securities 730,000 $ 0 4,235,000 $ 1,720,000  
Proceeds from sales of mortgage-backed securities 0 0 0 0  
Gross gains realized on sales 0 0 0 0  
Gross losses realized on sales 0 $ 0 0 $ 0  
Collateral pledged          
Available-for-sale debt securities amortized cost disclosures          
Amortized cost, Available-for-sale securities 1,720,908,000   1,720,908,000    
Available for sale debt securities, Estimated Fair Value Disclosures          
Fair value of available for sale investment securities pledged $ 1,532,931,000   $ 1,532,931,000