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Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 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)

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