XML 90 R75.htm IDEA: XBRL DOCUMENT
v3.22.4

Shareholders' Equity and Other Comprehensive Income - Summary of Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2019 | Jun. 21, 2018 | Dec. 31, 2022
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of stock |  | $ 200.0 |
Net Proceeds |  | $ 195.1 |
Liquidation preference (in dollars per share) |  | $ 25 |
Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of stock | $ 350.0 |  |
Net Proceeds | $ 342.0 |  |
Liquidation preference (in dollars per share) | $ 25 |  |
Up to and Excluding June 21, 2023 | Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D |  |  |
Class of Stock [Line Items] |  |  |
Dividend rate, percentage |  | 6.30% |
From and Including June 21, 2023 | Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D |  |  |
Class of Stock [Line Items] |  |  |
Dividend rate, percentage |  | 3.352% |
Until July 1, 2024 (Excluding July 1, 2024) | Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E |  |  |
Class of Stock [Line Items] |  |  |
Dividend rate, percentage | 5.875% |  | 5.875%
From July 1, 2024 (Including July 1, 2024) | Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E |  |  |
Class of Stock [Line Items] |  |  |
Dividend rate, percentage |  |  | 4.127%

X
- Definition Proceeds From Issuance Of Preferred Stock And Preference Stock, Net Of Issuance Costs + References No definition available. + Details
Name: | syn_ProceedsFromIssuanceOfPreferredStockAndPreferenceStockNetOfIssuanceCosts
Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21484-112644 + Details
Name: | us-gaap_PreferredStockLiquidationPreference
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesDPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesEPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | syn_TriggeringEventsAxis=syn_UpToAndExcludingJune212023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | syn_TriggeringEventsAxis=syn_FromandIncludingJune212023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | syn_TriggeringEventsAxis=syn_UntilJuly12024ExcludingJuly12024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | syn_TriggeringEventsAxis=syn_FromJuly12024IncludingJuly12024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |