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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Impaired Loans, Excluding Purchased Impaired (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Impaired loans |  |  |  |  |
Loans with allowance allocation | $ 5,353 |  | $ 5,353 |  | $ 7,102
Loans without allowance allocation | 3,302 |  | 3,302 |  | 7,417
Carrying balance | 8,655 |  | 8,655 |  | 14,519
Contractual balance | 11,046 |  | 11,046 |  | 16,963
Specifically allocated allowance | 504 |  | 504 |  | $ 566
Average carrying balance of individually assessed loans | 8,700 | $ 32,900 | $ 12,200 | $ 34,600 |
Interest income on individually assessed loans | $ 0 | $ 0 |  |  |

X
- Definition Amount of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References No definition available. + Details
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Namespace Prefix: | cbu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of contractual balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References No definition available. + Details
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Namespace Prefix: | cbu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of allowance for credit losses related to specifically allocated. + References No definition available. + Details
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Namespace Prefix: | cbu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References No definition available. + Details
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- Definition Amount of impaired financing receivables for which there is a related allowance for credit losses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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