v3.26.1
Investment Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Amortized Cost            
Due after one year through five years $ 172,583     $ 172,583    
Due after five years through ten years 330,479     330,479    
Due after ten years 1,452,692     1,452,692    
Amortized Cost 1,955,754     1,955,754   $ 2,048,030
Fair Value            
Due after one year through five years 160,937     160,937    
Due after five years through ten years 287,326     287,326    
Due after ten years 1,192,779     1,192,779    
Fair Value 1,641,042     1,641,042   1,732,850
Amortized Cost            
Due in one year or less 25,660     25,660    
Due after one year through five years 415,952     415,952    
Due after five years through ten years 1,211,660     1,211,660    
Due after ten years 5,363,160     5,363,160    
Amortized Cost 7,016,432     7,016,432   6,696,576
Fair Value            
Due in one year or less 25,525     25,525    
Due after one year through five years 411,268     411,268    
Due after five years through ten years 1,143,401     1,143,401    
Due after ten years 5,017,983     5,017,983    
Fair Value 6,598,177     6,598,177   $ 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       1,129    
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)