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Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 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 | $ 55,991 | $ 63,065
Available for Sale, Unrealized Losses, Less than 12 Months | (420) | (1,480)
Available for Sale, Estimated Fair Value, 12 Months or More | 215,455 | 206,969
Available for Sale, Unrealized Losses, 12 Months or More | (3,793) | (3,180)
Available for Sale, Estimated Fair Value, Total | 271,446 | 270,034
Available for Sale, Unrealized Losses, Total | (4,213) | (4,660)
Held to Maturity, Estimated Fair Value, Less than 12 Months | 388,714 | 133,665
Held to Maturity, Unrealized Losses, Less than 12 Months | (5,467) | (1,408)
Held to Maturity, Estimated Fair Value, 12 Months or More | 8,882,499 | 10,595,558
Held to Maturity, Unrealized Losses, 12 Months or More | (1,370,118) | (1,383,297)
Held to Maturity, Estimated Fair Value, Total | 9,271,213 | 10,729,223
Held to Maturity, Unrealized Losses, Total | (1,375,585) | (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 | 2,040 | 7,300
Available for Sale, Unrealized Losses, Less than 12 Months | (60) | (738)
Available for Sale, Estimated Fair Value, Total | 2,040 | 7,300
Available for Sale, Unrealized Losses, Total | (60) | (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 | 47,114 | 54,611
Available for Sale, Unrealized Losses, Less than 12 Months | (307) | (729)
Available for Sale, Estimated Fair Value, 12 Months or More | 125,942 | 114,758
Available for Sale, Unrealized Losses, 12 Months or More | (2,926) | (2,075)
Available for Sale, Estimated Fair Value, Total | 173,056 | 169,369
Available for Sale, Unrealized Losses, Total | (3,233) | (2,804)
Held to Maturity, Estimated Fair Value, Less than 12 Months | 28,362 | 50,147
Held to Maturity, Unrealized Losses, Less than 12 Months | (663) | (470)
Held to Maturity, Estimated Fair Value, 12 Months or More | 179,855 | 192,205
Held to Maturity, Unrealized Losses, 12 Months or More | (23,465) | (20,394)
Held to Maturity, Estimated Fair Value, Total | 208,217 | 242,352
Held to Maturity, Unrealized Losses, Total | (24,128) | (20,864)
Mortgage-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for Sale, Estimated Fair Value, Less than 12 Months | 6,837 | 1,154
Available for Sale, Unrealized Losses, Less than 12 Months | (53) | (13)
Available for Sale, Estimated Fair Value, 12 Months or More | 89,513 | 92,211
Available for Sale, Unrealized Losses, 12 Months or More | (867) | (1,105)
Available for Sale, Estimated Fair Value, Total | 96,350 | 93,365
Available for Sale, Unrealized Losses, Total | (920) | (1,118)
Held to Maturity, Estimated Fair Value, Less than 12 Months | 331,265 | 52,853
Held to Maturity, Unrealized Losses, Less than 12 Months | (4,647) | (807)
Held to Maturity, Estimated Fair Value, 12 Months or More | 8,646,541 | 10,354,514
Held to Maturity, Unrealized Losses, 12 Months or More | (1,340,416) | (1,356,476)
Held to Maturity, Estimated Fair Value, Total | 8,977,806 | 10,407,367
Held to Maturity, Unrealized Losses, Total | (1,345,063) | (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 | 5,817 | 7,580
Held to Maturity, Unrealized Losses, Less than 12 Months | (44) | (52)
Held to Maturity, Estimated Fair Value, Total | 5,817 | 7,580
Held to Maturity, Unrealized Losses, Total | (44) | (52)
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 | 23,085
Held to Maturity, Unrealized Losses, Less than 12 Months | (113) | (79)
Held to Maturity, Estimated Fair Value, 12 Months or More | 47,943 | 41,039
Held to Maturity, Unrealized Losses, 12 Months or More | (2,397) | (2,227)
Held to Maturity, Estimated Fair Value, Total | 71,213 | 64,124
Held to Maturity, Unrealized Losses, Total | $ (2,510) | $ (2,306)

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