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Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Schedule Of Available For Sale Securities [Line Items] |  |
Available for Sale, Estimated Fair Value, Less than 12 Months | $ 76,297 | $ 55,991
Available for Sale, Unrealized Losses, Less than 12 Months | (412) | (420)
Available for Sale, Estimated Fair Value, 12 Months or More | 235,897 | 215,455
Available for Sale, Unrealized Losses, 12 Months or More | (4,207) | (3,793)
Available for Sale, Estimated Fair Value, Total | 312,194 | 271,446
Available for Sale, Unrealized Losses, Total | (4,619) | (4,213)
Held to Maturity, Estimated Fair Value, Less than 12 Months | 225,619 | 388,714
Held to Maturity, Unrealized Losses, Less than 12 Months | (2,578) | (5,467)
Held to Maturity, Estimated Fair Value, 12 Months or More | 8,418,833 | 8,882,499
Held to Maturity, Unrealized Losses, 12 Months or More | (1,112,406) | (1,370,118)
Held to Maturity, Estimated Fair Value, Total | 8,644,452 | 9,271,213
Held to Maturity, Unrealized Losses, Total | (1,114,984) | (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 | 9,480 | 8,160
Held to Maturity, Unrealized Losses, 12 Months or More | (2,520) | (3,840)
Held to Maturity, Estimated Fair Value, Total | 9,480 | 8,160
Held to Maturity, Unrealized Losses, Total | (2,520) | (3,840)
Collateralized Mortgage Obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for Sale, Estimated Fair Value, Less than 12 Months | 66,621 | 47,114
Available for Sale, Unrealized Losses, Less than 12 Months | (357) | (307)
Available for Sale, Estimated Fair Value, 12 Months or More | 142,720 | 125,942
Available for Sale, Unrealized Losses, 12 Months or More | (3,432) | (2,926)
Available for Sale, Estimated Fair Value, Total | 209,341 | 173,056
Available for Sale, Unrealized Losses, Total | (3,789) | (3,233)
Held to Maturity, Estimated Fair Value, Less than 12 Months | 26,962 | 28,362
Held to Maturity, Unrealized Losses, Less than 12 Months | (96) | (663)
Held to Maturity, Estimated Fair Value, 12 Months or More | 172,831 | 179,855
Held to Maturity, Unrealized Losses, 12 Months or More | (16,151) | (23,465)
Held to Maturity, Estimated Fair Value, Total | 199,793 | 208,217
Held to Maturity, Unrealized Losses, Total | (16,247) | (24,128)
Mortgage-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for Sale, Estimated Fair Value, Less than 12 Months | 9,676 | 6,837
Available for Sale, Unrealized Losses, Less than 12 Months | (55) | (53)
Available for Sale, Estimated Fair Value, 12 Months or More | 93,177 | 89,513
Available for Sale, Unrealized Losses, 12 Months or More | (775) | (867)
Available for Sale, Estimated Fair Value, Total | 102,853 | 96,350
Available for Sale, Unrealized Losses, Total | (830) | (920)
Held to Maturity, Estimated Fair Value, Less than 12 Months | 182,819 | 331,265
Held to Maturity, Unrealized Losses, Less than 12 Months | (2,432) | (4,647)
Held to Maturity, Estimated Fair Value, 12 Months or More | 8,201,868 | 8,646,541
Held to Maturity, Unrealized Losses, 12 Months or More | (1,091,627) | (1,340,416)
Held to Maturity, Estimated Fair Value, Total | 8,384,687 | 8,977,806
Held to Maturity, Unrealized Losses, Total | (1,094,059) | (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 | 5,930 | 5,817
Held to Maturity, Unrealized Losses, Less than 12 Months | (16) | (44)
Held to Maturity, Estimated Fair Value, Total | 5,930 | 5,817
Held to Maturity, Unrealized Losses, Total | (16) | (44)
States and Political Subdivisions [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Held to Maturity, Estimated Fair Value, Less than 12 Months | 9,908 | 23,270
Held to Maturity, Unrealized Losses, Less than 12 Months | (34) | (113)
Held to Maturity, Estimated Fair Value, 12 Months or More | 34,654 | 47,943
Held to Maturity, Unrealized Losses, 12 Months or More | (2,108) | (2,397)
Held to Maturity, Estimated Fair Value, Total | 44,562 | 71,213
Held to Maturity, Unrealized Losses, Total | $ (2,142) | $ (2,510)

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