XML 63 R52.htm IDEA: XBRL DOCUMENT v3.25.1

Derivative Instruments and Hedging Activities - Schedule of Pre-Tax Effect of Changes in Fair Value from Derivative Instruments Not Designated as Hedging Instruments (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ (5,111)	$ 1,421
Interest rate contracts
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	261	(160)
Mortgage Derivatives | Mortgage derivatives - interest rate lock commitments
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	739	400
Mortgage Derivatives | Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(538)	462
Risk participation agreements
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(5)	(1)
Foreign exchange contracts
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(3,368)	720
Visa derivative
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ (2,200)	$ 0

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

+ Details

Name:	us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=syn_MortgageDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=syn_ForwardCommitmentsToSellFixedRateMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=syn_RiskParticipationAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=syn_VisaDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: