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Investment Securities - Schedule Of Unrealized Loss On Investments Securities Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 1,947,515 $ 409,725
Less than 12 months, gross unrealized losses (14,241) (2,666)
12 months or longer, fair value 3,405,155 7,513,154
12 months or longer, gross unrealized losses (520,697) (1,331,466)
Total, fair value 5,352,670 7,922,879
Total, gross unrealized losses (534,938) (1,334,132)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 675,205  
Less than 12 months, gross unrealized losses (4,167)  
12 months or longer, fair value 0  
12 months or longer, gross unrealized losses 0  
Total, fair value 675,205  
Total, gross unrealized losses (4,167)  
U.S. Government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 0 0
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 28,844 28,940
12 months or longer, gross unrealized losses (1,150) (1,053)
Total, fair value 28,844 28,940
Total, gross unrealized losses (1,150) (1,053)
Mortgage-backed securities issued by U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 441,549 159,402
Less than 12 months, gross unrealized losses (2,310) (1,268)
12 months or longer, fair value 673,891 565,358
12 months or longer, gross unrealized losses (116,733) (96,717)
Total, fair value 1,115,440 724,760
Total, gross unrealized losses (119,043) (97,985)
Mortgage-backed securities issued by U.S. Government sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 127,603 215,917
Less than 12 months, gross unrealized losses (3,143) (1,193)
12 months or longer, fair value 1,837,414 6,045,914
12 months or longer, gross unrealized losses (253,793) (1,093,019)
Total, fair value 1,965,017 6,261,831
Total, gross unrealized losses (256,936) (1,094,212)
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 0 0
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 547,997 587,595
12 months or longer, gross unrealized losses (111,709) (104,892)
Total, fair value 547,997 587,595
Total, gross unrealized losses (111,709) (104,892)
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 703,158 34,406
Less than 12 months, gross unrealized losses (4,621) (205)
12 months or longer, fair value 308,126 276,675
12 months or longer, gross unrealized losses (37,136) (35,448)
Total, fair value 1,011,284 311,081
Total, gross unrealized losses (41,757) (35,653)
Corporate debt securities and other debt securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 0 0
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 8,883 8,672
12 months or longer, gross unrealized losses (176) (337)
Total, fair value 8,883 8,672
Total, gross unrealized losses $ (176) $ (337)