XML 43 R31.htm IDEA: XBRL DOCUMENT
v3.24.3

COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2024
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS |
Schedule of the contract amounts of commitments and contingencies | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
(000’s omitted) | ​ | 2024 | ​ | 2023
Commitments to extend credit | ​ | $ | 1,682,414 | ​ | $ | 1,494,549
Standby letters of credit | ​ |  | 78,105 | ​ |  | 61,352
Total | ​ | $ | 1,760,519 | ​ | $ | 1,555,901

X
- Definition Tabular disclosure of the nature and terms of the financial instruments with off-balance sheet risk. + References No definition available. + Details
Name: | cbu_OffBalanceSheetFinancialInstrumentsTableTextBlock
Namespace Prefix: | cbu_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration