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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value $ 618,574 $ 356,234
Less Than 12 Months, Unrealized Losses (11,103) (12,782)
12 Months or More, Fair Value 974,040 1,778,899
12 Months or More, Unrealized Losses (56,938) (116,764)
Fair Value 1,592,614 2,135,133
Unrealized Losses (68,041) (129,546)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value   0
Less Than 12 Months, Unrealized Losses   0
12 Months or More, Fair Value   64,029
12 Months or More, Unrealized Losses   (4,027)
Fair Value   64,029
Unrealized Losses   (4,027)
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 266,568 0
Less Than 12 Months, Unrealized Losses (3,745) 0
12 Months or More, Fair Value 0 116,908
12 Months or More, Unrealized Losses 0 (12,681)
Fair Value 266,568 116,908
Unrealized Losses (3,745) (12,681)
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 126,602  
Less Than 12 Months, Unrealized Losses (2,717)  
12 Months or More, Fair Value 100,144  
12 Months or More, Unrealized Losses (13,395)  
Fair Value 226,746  
Unrealized Losses (16,112)  
Agency-guaranteed commercial collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 85,902  
Less Than 12 Months, Unrealized Losses (2,819)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Fair Value 85,902  
Unrealized Losses (2,819)  
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 35,710 29,241
Less Than 12 Months, Unrealized Losses (265) (392)
12 Months or More, Fair Value 205,639 438,551
12 Months or More, Unrealized Losses (1,928) (10,626)
Fair Value 241,349 467,792
Unrealized Losses (2,193) (11,018)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 77,708 121,636
12 Months or More, Unrealized Losses (999) (4,249)
Fair Value 77,708 121,636
Unrealized Losses (999) (4,249)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 74,373 23,243
Less Than 12 Months, Unrealized Losses (976) (1,147)
12 Months or More, Fair Value 239,509 424,768
12 Months or More, Unrealized Losses (16,064) (33,764)
Fair Value 313,882 448,011
Unrealized Losses (17,040) (34,911)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 29,419 303,750
Less Than 12 Months, Unrealized Losses (581) (11,243)
12 Months or More, Fair Value 351,040 613,007
12 Months or More, Unrealized Losses (24,552) (51,417)
Fair Value 380,459 916,757
Unrealized Losses $ (25,133) $ (62,660)