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Investment Securities - Gross Gains and Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized cost $ 2,707,799 $ 2,400,781
Gross unrealized gains 1,478 3
Gross unrealized losses (241,434) (367,982)
Fair value 2,467,843 2,032,802
Agency bond securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 179,227 240,628
Gross unrealized gains 0 0
Gross unrealized losses (22,252) (38,132)
Fair value 156,975 202,496
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 2,145,925 2,121,037
Gross unrealized gains 1,392 3
Gross unrealized losses (212,399) (323,467)
Fair value 1,934,918 1,797,573
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost   10,000
Gross unrealized gains   0
Gross unrealized losses   (110)
Fair value   9,890
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 28,137 29,116
Gross unrealized gains 0 0
Gross unrealized losses (5,581) (6,273)
Fair value 22,556 $ 22,843
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Gross unrealized gains 86  
Gross unrealized losses (1,202)  
Amortized cost 354,510  
Available-for-sale securities $ 353,394