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Securities Securities - Amortized Cost, Allowance for Credit Losses and Estimated Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 18,329,017 | $ 19,908,432
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 140 | 17,158
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,212,068 | 1,681,985
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 16,117,089 | 18,243,605
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,459,758 | 5,450,546
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 416,606 | 398,959
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 5,043,152 | 5,051,587
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,589,404 | 7,316,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 140 | 8,050
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,282,910 | 948,638
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 6,306,634 | 6,376,236
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,237,185 | 7,098,635
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 9,108
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 512,552 | 334,388
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 4,724,633 | 6,773,355
Other Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 42,670 | 42,427
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | $ 42,670 | $ 42,427

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