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Fair Value Accounting - Changes in Fair Value Included in Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value Disclosures [Abstract] |  |  |
Mortgage loans held for sale | $ (1,541) | $ (3,942) | $ 3,400
Fair value | 51,136 | 108,198 | 216,647
Unpaid principal balance | 50,264 | 105,785 | 210,292
Fair value less aggregate unpaid principal balance | $ 872 | $ 2,413 | $ 6,355

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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_
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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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Data Type: | xbrli:monetaryItemType
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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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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 https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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Balance Type: | credit
Period Type: | instant