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Securities (Securities Available for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 13,445,888 | $ 9,727,401
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 518,805 | 710,168
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 40,065 | 4
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 13,924,628 | 10,437,565
US Treasury [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,165,702 | 1,084,542
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 23,333 | 35,091
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 9,602 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 2,179,433 | 1,119,633
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,059,692 | 1,916,581
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 31,662 | 71,102
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 25,089 | 4
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 4,066,265 | 1,987,679
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,178,135 | 6,683,927
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 463,810 | 603,975
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,374 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale | 7,636,571 | 7,287,902
Other [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 42,359 | 42,351
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 | $ 42,359 | $ 42,351

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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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