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Long-term Debt and Short-term Borrowings - Principal Payments on Long-term Debt (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 10, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
2022 |  | $ 300,000 |  |
2023 |  | 400,000 |  |
2024 |  | 0 |  |
2025 |  | 0 |  |
2026 |  | 0 |  |
Thereafter |  | 510,000 |  |
Total |  | 1,210,000 |  |
Repayments of long-term debt, net |  | 0 | $ 2,408,939 | $ 157,226
Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
2022 |  | 0 |  |
2023 |  | 400,000 |  |
2024 |  | 0 |  |
2025 |  | 0 |  |
2026 |  | 0 |  |
Thereafter |  | 200,000 |  |
Total |  | 600,000 |  |
Synovus Bank | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt, net | $ 405,300 |  |  |
Parent Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
2022 |  | 300,000 |  |
2023 |  | 0 |  |
2024 |  | 0 |  |
2025 |  | 0 |  |
2026 |  | 0 |  |
Thereafter |  | 310,000 |  |
Total |  | 610,000 |  |
Repayments of long-term debt, net |  | $ 0 | $ 250,000 | $ 0

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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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