v3.26.3
Investment Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Amortized Cost            
Due in one year or less $ 35,395     $ 35,395    
Due after one year through five years 153,946     153,946    
Due after five years through ten years 297,776     297,776    
Due after ten years 1,418,182     1,418,182    
Amortized Cost 1,905,299     1,905,299   $ 2,048,030
Fair Value            
Due in one year or less 34,270     34,270    
Due after one year through five years 137,793     137,793    
Due after five years through ten years 248,151     248,151    
Due after ten years 1,099,062     1,099,062    
Fair Value 1,519,276     1,519,276   1,732,850
Amortized Cost            
Due in one year or less 33,882     33,882    
Due after one year through five years 465,164     465,164    
Due after five years through ten years 1,277,694     1,277,694    
Due after ten years 5,335,106     5,335,106    
Amortized Cost 7,111,846     7,111,846   6,696,576
Fair Value            
Due in one year or less 33,340     33,340    
Due after one year through five years 450,117     450,117    
Due after five years through ten years 1,159,011     1,159,011    
Due after ten years 4,750,841     4,750,841    
Fair Value 6,393,309     6,393,309   $ 6,313,756
Information with respect to sales of available-for-sale securities            
Sale proceeds         $ 2,874,110  
Gross realized gains         8,892  
Gross realized losses         (237,703)  
Net realized losses         (228,811)  
Sold securities 0 $ 0 $ 1,800,000 0    
Realized gains or losses     $ 0      
Information with respect to sales of held-to-maturity            
Proceeds from sales of investment securities held to maturity $ 0 $ 0   $ 0 0  
Gross unrealized losses       1,273    
Sales of Securities Acquired from Independent            
Information with respect to sales of available-for-sale securities            
Sale proceeds         1,279,717  
Investment Securities Sales            
Information with respect to sales of available-for-sale securities            
Sale proceeds         1,594,393  
Gross realized gains         8,892  
Gross realized losses         (237,703)  
Net realized losses         $ (228,811)