XML 59 R49.htm IDEA: XBRL DOCUMENT v3.24.0.1

Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2023

Regulatory Matters [Abstract]

Actual and Required Capital Ratios

The following table presents actual and required capital ratios as of December 31, 2023 and 2022 for the Company and the Bank under the Basel III Capital Rules. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules (dollars in thousands):

		Actual								Minimum Capital Required – Basel III								Required to be Considered Well Capitalized
		Amount				Ratio				Amount				Ratio				Amount				Ratio
2023
Tier 1 leverage:
Company		$	509,412				8.18	%		$	248,974				4.00	%		$	311,217				5.00	%
Bank			562,775				9.06				248,385				4.00				310,481				5.00
CET1 capital:
Company			492,120				9.43				365,311				7.00				339,217				6.50
Bank			562,775				10.82				364,191				7.00				338,177				6.50
Tier 1 capital:
Company			509,412				9.76				443,592				8.50				417,498				8.00
Bank			562,775				10.82				442,232				8.50				416,218				8.00
Total capital:
Company			632,860				12.13				547,966				10.50				521,872				10.00
Bank			611,691				11.76				546,286				10.50				520,272				10.00
2022
Tier 1 leverage:
Company		$	478,852				8.33	%		$	229,928				4.00	%		$	287,410				5.00	%
Bank			525,997				9.17				229,434				4.00				286,793				5.00
CET1 capital:
Company			461,560				9.42				342,852				7.00				318,363				6.50
Bank			525,997				10.77				341,944				7.00				317,520				6.50
Tier 1 capital:
Company			478,852				9.78				416,321				8.50				391,831				8.00
Bank			525,997				10.77				415,218				8.50				390,794				8.00
Total capital:
Company			593,969				12.13				514,278				10.50				489,789				10.00
Bank			566,891				11.60				512,917				10.50				488,492				10.00

X

- Definition

Regulatory Matters [Abstract]

+ References

No definition available.

+ Details

Name:	fisi_RegulatoryMattersAbstract
Namespace Prefix:	fisi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

+ Details

Name:	us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration