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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 74,900 $ 55,991
Available for Sale, Unrealized Losses, Less than 12 Months (457) (420)
Available for Sale, Estimated Fair Value, 12 Months or More 237,427 215,455
Available for Sale, Unrealized Losses, 12 Months or More (3,343) (3,793)
Available for Sale, Estimated Fair Value, Total 312,327 271,446
Available for Sale, Unrealized Losses, Total (3,800) (4,213)
Held to Maturity, Estimated Fair Value, Less than 12 Months 5,344 388,714
Held to Maturity, Unrealized Losses, Less than 12 Months (50) (5,467)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,307,773 8,882,499
Held to Maturity, Unrealized Losses, 12 Months or More (928,079) (1,370,118)
Held to Maturity, Estimated Fair Value, Total 8,313,117 9,271,213
Held to Maturity, Unrealized Losses, Total (928,129) (1,375,585)
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months   2,040
Available for Sale, Unrealized Losses, Less than 12 Months   (60)
Available for Sale, Estimated Fair Value, Total   2,040
Available for Sale, Unrealized Losses, Total   (60)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,840 8,160
Held to Maturity, Unrealized Losses, 12 Months or More (2,160) (3,840)
Held to Maturity, Estimated Fair Value, Total 9,840 8,160
Held to Maturity, Unrealized Losses, Total (2,160) (3,840)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 65,479 47,114
Available for Sale, Unrealized Losses, Less than 12 Months (395) (307)
Available for Sale, Estimated Fair Value, 12 Months or More 147,510 125,942
Available for Sale, Unrealized Losses, 12 Months or More (2,604) (2,926)
Available for Sale, Estimated Fair Value, Total 212,989 173,056
Available for Sale, Unrealized Losses, Total (2,999) (3,233)
Held to Maturity, Estimated Fair Value, Less than 12 Months 566 28,362
Held to Maturity, Unrealized Losses, Less than 12 Months (5) (663)
Held to Maturity, Estimated Fair Value, 12 Months or More 171,256 179,855
Held to Maturity, Unrealized Losses, 12 Months or More (12,478) (23,465)
Held to Maturity, Estimated Fair Value, Total 171,822 208,217
Held to Maturity, Unrealized Losses, Total (12,483) (24,128)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 9,421 6,837
Available for Sale, Unrealized Losses, Less than 12 Months (62) (53)
Available for Sale, Estimated Fair Value, 12 Months or More 89,917 89,513
Available for Sale, Unrealized Losses, 12 Months or More (739) (867)
Available for Sale, Estimated Fair Value, Total 99,338 96,350
Available for Sale, Unrealized Losses, Total (801) (920)
Held to Maturity, Estimated Fair Value, Less than 12 Months 4,778 331,265
Held to Maturity, Unrealized Losses, Less than 12 Months (45) (4,647)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,101,183 8,646,541
Held to Maturity, Unrealized Losses, 12 Months or More (912,010) (1,340,416)
Held to Maturity, Estimated Fair Value, Total 8,105,961 8,977,806
Held to Maturity, Unrealized Losses, Total (912,055) (1,345,063)
U.S. Government Agencies [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months   5,817
Held to Maturity, Unrealized Losses, Less than 12 Months   (44)
Held to Maturity, Estimated Fair Value, 12 Months or More 1,972  
Held to Maturity, Unrealized Losses, 12 Months or More (1)  
Held to Maturity, Estimated Fair Value, Total 1,972 5,817
Held to Maturity, Unrealized Losses, Total (1) (44)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months   23,270
Held to Maturity, Unrealized Losses, Less than 12 Months   (113)
Held to Maturity, Estimated Fair Value, 12 Months or More 23,522 47,943
Held to Maturity, Unrealized Losses, 12 Months or More (1,430) (2,397)
Held to Maturity, Estimated Fair Value, Total 23,522 71,213
Held to Maturity, Unrealized Losses, Total $ (1,430) $ (2,510)