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Fair Value Accounting (Mortgage Loans Held for Sale and Changes in Fair Value Included in Consolidated Statements of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value Disclosures [Abstract] |  |  |  |  |
Fair value | $ 152,258 |  | $ 152,258 |  | $ 216,647
Unpaid principal balance | 148,202 |  | 148,202 |  | 210,292
Fair value less aggregate unpaid principal balance | 4,056 |  | 4,056 |  | $ 6,355
Mortgage loans held for sale | $ (1,761) | $ 251 | $ (2,299) | $ 6,235 |

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- Definition Changes in the fair value of mortgage loans held for sale that were included in the consolidated statements of income during the reporting period. + References No definition available. + Details
Name: | syn_ChangeInMortgageLoansHeldForSaleIncludedInNetIncome
Namespace Prefix: | syn_
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Balance Type: | credit
Period Type: | duration

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- Definition Fair value option, aggregate unpaid principal balance of mortgage loans held for sale. + References No definition available. + Details
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Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
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