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Securities (Securities Available for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 19,908,432 | $ 13,445,888
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 17,158 | 518,805
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,681,985 | 40,065
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 18,243,605 | 13,924,628
US Treasury [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,450,546 | 2,165,702
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 23,333
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 398,959 | 9,602
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 5,051,587 | 2,179,433
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,316,824 | 4,059,692
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 8,050 | 31,662
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 948,638 | 25,089
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 6,376,236 | 4,066,265
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,098,635 | 7,178,135
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 9,108 | 463,810
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 334,388 | 5,374
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 6,773,355 | 7,636,571
Other [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 42,427 | 42,359
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 | $ 42,427 | $ 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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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