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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 73,574 $ 63,065
Available for Sale, Unrealized Losses, Less than 12 Months (1,269) (1,480)
Available for Sale, Estimated Fair Value, 12 Months or More 227,998 206,969
Available for Sale, Unrealized Losses, 12 Months or More (3,572) (3,180)
Available for Sale, Estimated Fair Value, Total 301,572 270,034
Available for Sale, Unrealized Losses, Total (4,841) (4,660)
Held to Maturity, Estimated Fair Value, Less than 12 Months 217,592 133,665
Held to Maturity, Unrealized Losses, Less than 12 Months (3,272) (1,408)
Held to Maturity, Estimated Fair Value, 12 Months or More 10,146,776 10,595,558
Held to Maturity, Unrealized Losses, 12 Months or More (1,505,359) (1,383,297)
Held to Maturity, Estimated Fair Value, Total 10,364,368 10,729,223
Held to Maturity, Unrealized Losses, Total (1,508,631) (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 5,265 7,300
Available for Sale, Unrealized Losses, Less than 12 Months (335) (738)
Available for Sale, Estimated Fair Value, Total 5,265 7,300
Available for Sale, Unrealized Losses, Total (335) (738)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,160 7,800
Held to Maturity, Unrealized Losses, 12 Months or More (3,840) (4,200)
Held to Maturity, Estimated Fair Value, Total 8,160 7,800
Held to Maturity, Unrealized Losses, Total (3,840) (4,200)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 58,266 54,611
Available for Sale, Unrealized Losses, Less than 12 Months (874) (729)
Available for Sale, Estimated Fair Value, 12 Months or More 136,540 114,758
Available for Sale, Unrealized Losses, 12 Months or More (2,500) (2,075)
Available for Sale, Estimated Fair Value, Total 194,806 169,369
Available for Sale, Unrealized Losses, Total (3,374) (2,804)
Held to Maturity, Estimated Fair Value, Less than 12 Months 47,876 50,147
Held to Maturity, Unrealized Losses, Less than 12 Months (1,261) (470)
Held to Maturity, Estimated Fair Value, 12 Months or More 183,228 192,205
Held to Maturity, Unrealized Losses, 12 Months or More (23,815) (20,394)
Held to Maturity, Estimated Fair Value, Total 231,104 242,352
Held to Maturity, Unrealized Losses, Total (25,076) (20,864)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 10,043 1,154
Available for Sale, Unrealized Losses, Less than 12 Months (60) (13)
Available for Sale, Estimated Fair Value, 12 Months or More 91,458 92,211
Available for Sale, Unrealized Losses, 12 Months or More (1,072) (1,105)
Available for Sale, Estimated Fair Value, Total 101,501 93,365
Available for Sale, Unrealized Losses, Total (1,132) (1,118)
Held to Maturity, Estimated Fair Value, Less than 12 Months 147,256 52,853
Held to Maturity, Unrealized Losses, Less than 12 Months (1,836) (807)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,900,482 10,354,514
Held to Maturity, Unrealized Losses, 12 Months or More (1,475,191) (1,356,476)
Held to Maturity, Estimated Fair Value, Total 10,047,738 10,407,367
Held to Maturity, Unrealized Losses, Total (1,477,027) (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 7,583 7,580
Held to Maturity, Unrealized Losses, Less than 12 Months (107) (52)
Held to Maturity, Estimated Fair Value, Total 7,583 7,580
Held to Maturity, Unrealized Losses, Total (107) (52)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 14,877 23,085
Held to Maturity, Unrealized Losses, Less than 12 Months (68) (79)
Held to Maturity, Estimated Fair Value, 12 Months or More 54,906 41,039
Held to Maturity, Unrealized Losses, 12 Months or More (2,513) (2,227)
Held to Maturity, Estimated Fair Value, Total 69,783 64,124
Held to Maturity, Unrealized Losses, Total $ (2,581) $ (2,306)