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Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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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)

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