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Note 22 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other real estate owned, gain (loss)	$ 46	$ 163	$ (73)
Fair Value, Nonrecurring [Member]
Collateral dependent loans, fair value	0	0	0
Collateral dependent loans	303	891	59
Other real estate owned, fair value	0	0	0
Other real estate owned, gain (loss)	0	17	52
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0	0	0
Other real estate owned, fair value	0	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	20,637	4,487	7,546
Other real estate owned, fair value	677	7,212	281
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	20,637	4,487	7,546
Other real estate owned, fair value	$ 677	$ 7,212	$ 281

X

- Definition

The amount of gains (losses) on collateral dependent loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	sybt_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The fair value amount of impaired loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The fair value related to other real assets owned fair value disclosure.

+ References

No definition available.

+ Details

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Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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- Details

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