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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Oct. 15, 2022
Amortized cost      
Amortized cost - Within 1 year $ 7,105,166    
Amortized cost - After 1 to 5 years 3,699,918    
Amortized cost - After 5 to 10 years 1,120,446    
Amortized cost - After 10 years 6,175,633    
Amortized Cost 18,101,163 $ 19,562,549  
Gross unrealized gains      
Gross unrealized gains 1,394 1,516  
Gross unrealized loss      
Gross unrealized losses 1,373,513 1,759,691  
Fair Value      
Fair value - Within 1 year 7,046,274    
Fair value - After 1 to 5 years 3,525,430    
Fair value - After 5 to 10 years 1,037,788    
Fair value - After 10 years 5,119,552    
Debt securities available-for-sale $ 16,729,044 $ 17,804,374  
Weighted average yield      
Weighted Average Yield 2.35% 1.75%  
US Treasury Securities      
Amortized cost      
Amortized cost - Within 1 year $ 7,103,518 $ 4,576,127  
Amortized cost - After 1 to 5 years 3,598,209 6,793,739  
Amortized cost - After 5 to 10 years 307,512 308,854  
Amortized Cost 11,009,239 11,678,720  
Gross unrealized gains      
Gross unrealized gain - Within 1 year 526 506  
Gross unrealized gain - After 1 to 5 years 84 0  
Gross unrealized gain - After 5 to 10 years 0 0  
Gross unrealized gains 610 506  
Gross unrealized loss      
Gross unrealized losses - Within 1 year 59,415 47,156  
Gross unrealized losses - After 1 to 5 years 170,209 410,858  
Gross unrealized losses - After 5 to 10 years 33,164 40,264  
Gross unrealized losses 262,788 498,278 $ 873,000
Fair Value      
Fair value - Within 1 year 7,044,629 4,529,477  
Fair value - After 1 to 5 years 3,428,084 6,382,881  
Fair value - After 5 to 10 years 274,348 268,590  
Debt securities available-for-sale $ 10,747,061 $ 11,180,948  
Weighted average yield      
Weighted average yield - Within 1 year 3.51% 2.42%  
Weighted average yield - After 1 to 5 years 1.35% 1.35%  
Weighted average yield - After 5 to 10 years 1.63% 1.63%  
Weighted Average Yield 2.75% 1.78%  
Collateralized Mortgage Obligations - Federal agencies      
Amortized cost      
Amortized cost - After 1 to 5 years $ 17,899 $ 3,914  
Amortized cost - After 5 to 10 years 20,503 47,979  
Amortized cost - After 10 years 108,280 127,639  
Amortized Cost 146,682 179,532  
Gross unrealized gains      
Gross unrealized gain - After 1 to 5 years 0 0  
Gross unrealized gain - After 5 to 10 years 2 0  
Gross unrealized gain - After 10 years 29 24  
Gross unrealized gains 31 24  
Gross unrealized loss      
Gross unrealized losses - After 1 to 5 years 838 213  
Gross unrealized losses - After 5 to 10 years 1,321 3,428  
Gross unrealized losses - After 10 years 9,868 10,719  
Gross unrealized losses 12,027 14,360  
Fair Value      
Fair value - After 1 to 5 years 17,061 3,701  
Fair value - After 5 to 10 years 19,184 44,551  
Fair value - After 10 years 98,441 116,944  
Debt securities available-for-sale $ 134,686 $ 165,196  
Weighted average yield      
Weighted average yield - After 1 to 5 years 1.55% 1.77%  
Weighted average yield - After 5 to 10 years 2.28% 1.73%  
Weighted average yield - After 10 years 2.54% 2.53%  
Weighted Average Yield 2.38% 2.30%  
Mortgage Backed Securities      
Amortized cost      
Amortized cost - Within 1 year $ 637    
Amortized cost - After 1 to 5 years 82,310 $ 74,328  
Amortized cost - After 5 to 10 years 792,431 866,757  
Amortized cost - After 10 years 6,067,353 6,762,150  
Amortized Cost 6,942,731 7,703,235  
Gross unrealized gains      
Gross unrealized gain - Within 1 year 0    
Gross unrealized gain - After 1 to 5 years 11 11  
Gross unrealized gain - After 5 to 10 years 75 43  
Gross unrealized gain - After 10 years 667 932  
Gross unrealized gains 753 986  
Gross unrealized loss      
Gross unrealized losses - Within 1 year 3    
Gross unrealized losses - After 1 to 5 years 3,536 3,428  
Gross unrealized losses - After 5 to 10 years 48,250 58,997  
Gross unrealized losses - After 10 years 1,046,909 1,184,626  
Gross unrealized losses 1,098,698 1,247,051  
Fair Value      
Fair value - Within 1 year 634    
Fair value - After 1 to 5 years 78,785 70,911  
Fair value - After 5 to 10 years 744,256 807,803  
Fair value - After 10 years 5,021,111 5,578,456  
Debt securities available-for-sale $ 5,844,786 $ 6,457,170  
Weighted average yield      
Weighted average yield - Within 1 year 3.72%    
Weighted average yield - After 1 to 5 years 2.34% 2.33%  
Weighted average yield - After 5 to 10 years 2.28% 2.16%  
Weighted average yield - After 10 years 1.64% 1.61%  
Weighted Average Yield 1.72% 1.68%  
Other      
Amortized cost      
Amortized cost - Within 1 year $ 1,011    
Amortized cost - After 1 to 5 years 1,500 $ 1,062  
Amortized Cost 2,511 1,062  
Gross unrealized gains      
Gross unrealized gain - Within 1 year 0    
Gross unrealized gain - After 1 to 5 years 0 0  
Gross unrealized gains 0 0  
Gross unrealized loss      
Gross unrealized losses - Within 1 year 0    
Gross unrealized losses - After 1 to 5 years 0 2  
Gross unrealized losses 0 2  
Fair Value      
Fair value - Within 1 year 1,011    
Fair value - After 1 to 5 years 1,500 1,060  
Debt securities available-for-sale $ 2,511 $ 1,060  
Weighted average yield      
Weighted average yield - Within 1 year 4.00%    
Weighted average yield - After 1 to 5 years 8.50% 3.98%  
Weighted Average Yield 6.69% 3.98%