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Investment Securities - Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair value    
Less than 12 months $ 826,487 $ 15,311
12 months or more 1,228,953 2,016,530
Total fair value 2,055,440 2,031,841
Unrealized loss    
Less than 12 months (2,966) (937)
12 months or more (238,468) (367,045)
Total unrealized loss (241,434) (367,982)
Corporate bonds    
Fair value    
Less than 12 months   0
12 months or more   9,890
Total fair value   9,890
Unrealized loss    
Less than 12 months   0
12 months or more   (110)
Total unrealized loss   (110)
Agency bond securities    
Fair value    
Less than 12 months 0 0
12 months or more 156,975 202,496
Total fair value 156,975 202,496
Unrealized loss    
Less than 12 months 0 0
12 months or more (22,252) (38,132)
Total unrealized loss (22,252) (38,132)
Agency mortgage-backed securities    
Fair value    
Less than 12 months 504,676 15,311
12 months or more 1,049,422 1,781,301
Total fair value 1,554,098 1,796,612
Unrealized loss    
Less than 12 months (1,764) (937)
12 months or more (210,635) (322,530)
Total unrealized loss (212,399) (323,467)
Municipal bonds    
Fair value    
Less than 12 months 0 0
12 months or more 22,556 22,843
Total fair value 22,556 22,843
Unrealized loss    
Less than 12 months 0 0
12 months or more (5,581) (6,273)
Total unrealized loss (5,581) $ (6,273)
Asset-backed securities    
Fair value    
Less than 12 months 321,811  
12 months or more 0  
Total fair value 321,811  
Unrealized loss    
Less than 12 months (1,202)  
12 months or more 0  
Total unrealized loss $ (1,202)