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Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Other real estate owned, gain (loss)			$ (5)	$ 180
Fair Value, Nonrecurring [Member]
Collateral dependent loans, fair value	$ 0		0		$ 0
Collateral dependent loans	377	$ 0	377	0
Other real estate owned, fair value	0		0		0
Other real estate owned, gain (loss)	0	$ 0	0	$ 0
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	13,039		13,039		4,487
Other real estate owned, fair value	996		996		7,212
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	13,039		13,039		4,487
Other real estate owned, fair value	$ 996		$ 996		$ 7,212

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
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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
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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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