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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 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 16,616,594 | $ 13,445,888
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 144,335 | 518,805
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 576,390 | 40,065
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 16,184,539 | 13,924,628
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,658,506 | 2,165,702
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,883 | 23,333
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 152,643 | 9,602
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 3,507,746 | 2,179,433
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,696,906 | 4,059,692
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7,246 | 31,662
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 328,113 | 25,089
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 5,376,039 | 4,066,265
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,218,821 | 7,178,135
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 135,206 | 463,810
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 95,634 | 5,374
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Securities available for sale, at estimated fair value | 7,258,393 | 7,636,571
Other Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 42,361 | 42,359
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 | $ 42,361 | $ 42,359

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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