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Securities (Securities Available for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 16,602,158 | $ 17,965,338
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,845 | 14,828
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,563,378 | 1,401,795
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 15,043,625 | 16,578,371
US Treasury [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,692,215 | 5,212,894
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 249,895 | 285,305
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 3,442,320 | 4,927,589
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 8,024,704 | 7,463,954
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,352 | 9,066
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,029,154 | 876,338
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 6,997,902 | 6,596,682
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,842,060 | 5,245,721
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,493 | 5,762
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 284,329 | 240,152
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 4,560,224 | 5,011,331
Other [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 43,179 | 42,769
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | $ 43,179 | $ 42,769

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