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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value Disclosures [Abstract] |  |  |  |  |
Unpaid principal balance | $ 276,709 |  | $ 276,709 |  | $ 112,218
Fair value less aggregate unpaid principal balance | 9,190 |  | 9,190 |  | $ 2,955
Mortgage loans held for sale | $ 251 | $ 892 | $ 6,235 | $ 1,593 |

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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
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Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
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
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=75031198&loc=d3e14064-108612 + Details
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