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GOVERNMENT AND GOVERNMENT-BACKED SECURITIES - Schedule of Agency and Treasury Securities by Designation (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Weighted Average Life (Years) 3 years 9 months 18 days  
Agency    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 10,066,127  
Gross unrealized gains 208,667  
Gross unrealized losses (374)  
Carrying value $ 10,110,166 $ 8,533,130
Number of Securities | security 46  
Weighted Average Coupon 4.80%  
Weighted average yield 4.80%  
Weighted Average Life (Years) 4 years 6 months  
Securities Designated as Available-for-Sale:    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 70,544  
Gross unrealized gains 0  
Gross unrealized losses 0  
Carrying value $ 64,089 65,496
Number of Securities | security 1  
Weighted Average Coupon 3.50%  
Weighted average yield 3.50%  
Weighted Average Life (Years) 7 years 9 months 18 days  
Securities Measured at Fair Value through Net Income:    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 6,745,583  
Gross unrealized gains 168,784  
Gross unrealized losses (374)  
Carrying value $ 6,748,811 8,467,634
Number of Securities | security 42  
Weighted Average Coupon 5.00%  
Weighted average yield 5.00%  
Weighted Average Life (Years) 5 years 8 months 12 days  
US Treasury    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 3,250,000  
Gross unrealized gains 39,883  
Gross unrealized losses 0  
Carrying value $ 3,297,266 $ 0
Number of Securities | security 3  
Weighted Average Coupon 4.50%  
Weighted average yield 4.50%  
Weighted Average Life (Years) 1 year 10 months 24 days