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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 63,065 $ 156,771
Available for Sale, Unrealized Losses, Less than 12 Months (1,480) (5,639)
Available for Sale, Estimated Fair Value, 12 Months or More 206,969 99,470
Available for Sale, Unrealized Losses, 12 Months or More (3,180) (40)
Available for Sale, Estimated Fair Value, Total 270,034 256,241
Available for Sale, Unrealized Losses, Total (4,660) (5,679)
Held to Maturity, Estimated Fair Value, Less than 12 Months 133,665 5,550,115
Held to Maturity, Unrealized Losses, Less than 12 Months (1,408) (442,015)
Held to Maturity, Estimated Fair Value, 12 Months or More 10,595,558 6,606,126
Held to Maturity, Unrealized Losses, 12 Months or More (1,383,297) (1,194,183)
Held to Maturity, Estimated Fair Value, Total 10,729,223 12,156,241
Held to Maturity, Unrealized Losses, Total (1,384,705) (1,636,198)
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 7,300  
Available for Sale, Unrealized Losses, Less than 12 Months (738)  
Available for Sale, Estimated Fair Value, Total 7,300  
Available for Sale, Unrealized Losses, Total (738)  
Held to Maturity, Estimated Fair Value, Less than 12 Months   9,480
Held to Maturity, Unrealized Losses, Less than 12 Months   (2,520)
Held to Maturity, Estimated Fair Value, 12 Months or More 7,800  
Held to Maturity, Unrealized Losses, 12 Months or More (4,200)  
Held to Maturity, Estimated Fair Value, Total 7,800 9,480
Held to Maturity, Unrealized Losses, Total (4,200) (2,520)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 54,611 61,559
Available for Sale, Unrealized Losses, Less than 12 Months (729) (3,012)
Available for Sale, Estimated Fair Value, 12 Months or More 114,758 99,179
Available for Sale, Unrealized Losses, 12 Months or More (2,075) (27)
Available for Sale, Estimated Fair Value, Total 169,369 160,738
Available for Sale, Unrealized Losses, Total (2,804) (3,039)
Held to Maturity, Estimated Fair Value, Less than 12 Months 50,147 214,538
Held to Maturity, Unrealized Losses, Less than 12 Months (470) (22,557)
Held to Maturity, Estimated Fair Value, 12 Months or More 192,205 4,358
Held to Maturity, Unrealized Losses, 12 Months or More (20,394) (365)
Held to Maturity, Estimated Fair Value, Total 242,352 218,896
Held to Maturity, Unrealized Losses, Total (20,864) (22,922)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 1,154 95,212
Available for Sale, Unrealized Losses, Less than 12 Months (13) (2,627)
Available for Sale, Estimated Fair Value, 12 Months or More 92,211 291
Available for Sale, Unrealized Losses, 12 Months or More (1,105) (13)
Available for Sale, Estimated Fair Value, Total 93,365 95,503
Available for Sale, Unrealized Losses, Total (1,118) (2,640)
Held to Maturity, Estimated Fair Value, Less than 12 Months 52,853 5,276,315
Held to Maturity, Unrealized Losses, Less than 12 Months (807) (416,053)
Held to Maturity, Estimated Fair Value, 12 Months or More 10,354,514 6,585,470
Held to Maturity, Unrealized Losses, 12 Months or More (1,356,476) (1,191,448)
Held to Maturity, Estimated Fair Value, Total 10,407,367 11,861,785
Held to Maturity, Unrealized Losses, Total (1,357,283) (1,607,501)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 7,580  
Held to Maturity, Unrealized Losses, Less than 12 Months (52)  
Held to Maturity, Estimated Fair Value, Total 7,580  
Held to Maturity, Unrealized Losses, Total (52)  
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 23,085 49,782
Held to Maturity, Unrealized Losses, Less than 12 Months (79) (885)
Held to Maturity, Estimated Fair Value, 12 Months or More 41,039 16,298
Held to Maturity, Unrealized Losses, 12 Months or More (2,227) (2,370)
Held to Maturity, Estimated Fair Value, Total 64,124 66,080
Held to Maturity, Unrealized Losses, Total $ (2,306) $ (3,255)