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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 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 18,860,732 | $ 19,908,432
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6,203 | 17,158
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,617,678 | 1,681,985
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 17,249,257 | 18,243,605
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,456,656 | 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 | 383,768 | 398,959
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 5,072,888 | 5,051,587
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,725,403 | 7,316,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5,105 | 8,050
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 937,733 | 948,638
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 6,792,775 | 6,376,236
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,636,095 | 7,098,635
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,098 | 9,108
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 296,177 | 334,388
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 5,341,016 | 6,773,355
Other Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 42,578 | 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 | $ 42,578 | $ 42,427

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