XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.22.0.1

COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS |
Schedule of The contract amounts of commitments and contingencies | The contract amounts of commitments and contingencies are as follows at December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​
(000’s omitted) |  | 2021 |  | 2020
Commitments to extend credit | ​ | $ | 1,443,879 | ​ | $ | 1,313,568
Standby letters of credit | ​ |  | 42,684 | ​ |  | 39,213
Total | ​ | $ | 1,486,563 | ​ | $ | 1,352,781

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