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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 50,926 $ 63,065
Available for Sale, Unrealized Losses, Less than 12 Months (260) (1,480)
Available for Sale, Estimated Fair Value, 12 Months or More 222,546 206,969
Available for Sale, Unrealized Losses, 12 Months or More (2,911) (3,180)
Available for Sale, Estimated Fair Value, Total 273,472 270,034
Available for Sale, Unrealized Losses, Total (3,171) (4,660)
Held to Maturity, Estimated Fair Value, Less than 12 Months 2,096 133,665
Held to Maturity, Unrealized Losses, Less than 12 Months (13) (1,408)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,609,644 10,595,558
Held to Maturity, Unrealized Losses, 12 Months or More (1,012,168) (1,383,297)
Held to Maturity, Estimated Fair Value, Total 9,611,740 10,729,223
Held to Maturity, Unrealized Losses, Total (1,012,181) (1,384,705)
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, 12 Months or More 3,450  
Available for Sale, Unrealized Losses, 12 Months or More (50)  
Available for Sale, Estimated Fair Value, Total 3,450 7,300
Available for Sale, Unrealized Losses, Total (50) (738)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,400 7,800
Held to Maturity, Unrealized Losses, 12 Months or More (3,600) (4,200)
Held to Maturity, Estimated Fair Value, Total 8,400 7,800
Held to Maturity, Unrealized Losses, Total (3,600) (4,200)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 36,514 54,611
Available for Sale, Unrealized Losses, Less than 12 Months (204) (729)
Available for Sale, Estimated Fair Value, 12 Months or More 129,093 114,758
Available for Sale, Unrealized Losses, 12 Months or More (1,921) (2,075)
Available for Sale, Estimated Fair Value, Total 165,607 169,369
Available for Sale, Unrealized Losses, Total (2,125) (2,804)
Held to Maturity, Estimated Fair Value, Less than 12 Months 29 50,147
Held to Maturity, Unrealized Losses, Less than 12 Months   (470)
Held to Maturity, Estimated Fair Value, 12 Months or More 196,396 192,205
Held to Maturity, Unrealized Losses, 12 Months or More (14,323) (20,394)
Held to Maturity, Estimated Fair Value, Total 196,425 242,352
Held to Maturity, Unrealized Losses, Total (14,323) (20,864)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 14,412 1,154
Available for Sale, Unrealized Losses, Less than 12 Months (56) (13)
Available for Sale, Estimated Fair Value, 12 Months or More 90,003 92,211
Available for Sale, Unrealized Losses, 12 Months or More (940) (1,105)
Available for Sale, Estimated Fair Value, Total 104,415 93,365
Available for Sale, Unrealized Losses, Total (996) (1,118)
Held to Maturity, Estimated Fair Value, Less than 12 Months 1,420 52,853
Held to Maturity, Unrealized Losses, Less than 12 Months (12) (807)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,353,645 10,354,514
Held to Maturity, Unrealized Losses, 12 Months or More (992,274) (1,356,476)
Held to Maturity, Estimated Fair Value, Total 9,355,065 10,407,367
Held to Maturity, Unrealized Losses, Total (992,286) (1,357,283)
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, 12 Months or More 1,989  
Held to Maturity, Unrealized Losses, 12 Months or More (3)  
Held to Maturity, Estimated Fair Value, Total 1,989 7,580
Held to Maturity, Unrealized Losses, Total (3) (52)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 647 23,085
Held to Maturity, Unrealized Losses, Less than 12 Months (1) (79)
Held to Maturity, Estimated Fair Value, 12 Months or More 49,214 41,039
Held to Maturity, Unrealized Losses, 12 Months or More (1,968) (2,227)
Held to Maturity, Estimated Fair Value, Total 49,861 64,124
Held to Maturity, Unrealized Losses, Total $ (1,969) $ (2,306)