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Investment Securities - Schedule of Gross Unrealized Losses on Investment Securities and the Fair Value of the Related Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 2,979,465 $ 409,725
Less than 12 months, gross unrealized losses (37,202) (2,666)
12 months or longer, fair value 2,956,231 7,513,154
12 months or longer, gross unrealized losses (500,723) (1,331,466)
Total, fair value 5,935,696 7,922,879
Total, gross unrealized losses (537,925) (1,334,132)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 716,367  
Less than 12 months, gross unrealized losses (4,824)  
12 months or longer, fair value 0  
12 months or longer, gross unrealized losses 0  
Total, fair value 716,367  
Total, gross unrealized losses (4,824)  
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 29,163 28,940
12 months or longer, gross unrealized losses (830) (1,053)
Total, fair value 29,163 28,940
Total, gross unrealized losses (830) (1,053)
Mortgage-backed securities issued by U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 716,268 159,402
Less than 12 months, gross unrealized losses (8,431) (1,268)
12 months or longer, fair value 577,468 565,358
12 months or longer, gross unrealized losses (112,958) (96,717)
Total, fair value 1,293,736 724,760
Total, gross unrealized losses (121,389) (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 456,887 215,917
Less than 12 months, gross unrealized losses (12,503) (1,193)
12 months or longer, fair value 1,542,618 6,045,914
12 months or longer, gross unrealized losses (248,412) (1,093,019)
Total, fair value 1,999,505 6,261,831
Total, gross unrealized losses (260,915) (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 29,040 0
Less than 12 months, gross unrealized losses (820) 0
12 months or longer, fair value 521,161 587,595
12 months or longer, gross unrealized losses (106,432) (104,892)
Total, fair value 550,201 587,595
Total, gross unrealized losses (107,252) (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 1,060,903 34,406
Less than 12 months, gross unrealized losses (10,624) (205)
12 months or longer, fair value 276,850 276,675
12 months or longer, gross unrealized losses (31,952) (35,448)
Total, fair value 1,337,753 311,081
Total, gross unrealized losses (42,576) (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 8,971 8,672
12 months or longer, gross unrealized losses (139) (337)
Total, fair value 8,971 8,672
Total, gross unrealized losses $ (139) $ (337)