XML 81 R66.htm IDEA: XBRL DOCUMENT
v3.22.4

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructurings (TDRs) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 194 | 232 | 247
TDRs, amount | $ 5,629 | $ 8,239 | $ 6,984
Number of loans modified in TDR | 24 | 54 | 55
Loans modified in TDR during the year, amount | $ 784 | $ 3,087 | $ 1,756
Business lending loans | $ 500 |  |
Nonaccrual |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 62 | 81 | 73
TDRs, amount | $ 2,461 | $ 3,940 | $ 3,227
Accruing |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 132 | 151 | 174
TDRs, amount | $ 3,168 | $ 4,299 | $ 3,757
Commercial Portfolio Segment | Business Lending |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 4 | 14 | 10
TDRs, amount | $ 406 | $ 1,822 | $ 720
Number of loans modified in TDR | loan | 0 | 5 | 1
Loans modified in TDR during the year, amount | $ 0 | $ 1,371 | $ 4
Commercial Portfolio Segment | Business Lending | Nonaccrual |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 1 | 10 | 6
TDRs, amount | $ 135 | $ 1,011 | $ 529
Commercial Portfolio Segment | Business Lending | Accruing |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 3 | 4 | 4
TDRs, amount | $ 271 | $ 811 | $ 191
Residential Portfolio Segment | Consumer Mortgage |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 98 | 108 | 104
TDRs, amount | $ 4,332 | $ 5,114 | $ 4,679
Number of loans modified in TDR | loan | 7 | 24 | 17
Loans modified in TDR during the year, amount | $ 597 | $ 1,425 | $ 1,339
Residential Portfolio Segment | Consumer Mortgage | Nonaccrual |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 52 | 61 | 56
TDRs, amount | $ 2,218 | $ 2,694 | $ 2,413
Residential Portfolio Segment | Consumer Mortgage | Accruing |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 46 | 47 | 48
TDRs, amount | $ 2,114 | $ 2,420 | $ 2,266
Consumer Portfolio Segment | Consumer Indirect |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 56 | 72 | 86
TDRs, amount | $ 600 | $ 829 | $ 951
Number of loans modified in TDR | loan | 13 | 23 | 31
Loans modified in TDR during the year, amount | $ 178 | $ 284 | $ 333
Consumer Portfolio Segment | Consumer Indirect | Nonaccrual |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 0 | 0 | 0
TDRs, amount | $ 0 | $ 0 | $ 0
Consumer Portfolio Segment | Consumer Indirect | Accruing |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 56 | 72 | 86
TDRs, amount | $ 600 | $ 829 | $ 951
Consumer Portfolio Segment | Consumer Direct |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 18 | 16 | 23
TDRs, amount | $ 5 | $ 7 | $ 85
Number of loans modified in TDR | loan | 3 | 2 | 3
Loans modified in TDR during the year, amount | $ 5 | $ 7 | $ 10
Consumer Portfolio Segment | Consumer Direct | Nonaccrual |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 0 | 0 | 0
TDRs, amount | $ 0 | $ 0 | $ 0
Consumer Portfolio Segment | Consumer Direct | Accruing |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 18 | 16 | 23
TDRs, amount | $ 5 | $ 7 | $ 85
Consumer Portfolio Segment | Home Equity |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 18 | 22 | 24
TDRs, amount | $ 286 | $ 467 | $ 549
Number of loans modified in TDR | loan | 1 | 0 | 3
Loans modified in TDR during the year, amount | $ 4 | $ 0 | $ 70
Consumer Portfolio Segment | Home Equity | Nonaccrual |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 9 | 10 | 11
TDRs, amount | $ 108 | $ 235 | $ 285
Consumer Portfolio Segment | Home Equity | Accruing |  |  |
Troubled Debt Restructurings (TDRs) |  |  |
TDRs, number | loan | 9 | 12 | 13
TDRs, amount | $ 178 | $ 232 | $ 264

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | cbu_FinancingReceivableModificationsNumberOfContracts
Namespace Prefix: | cbu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of business lending loans from individual. + References No definition available. + Details
Name: | cbu_IndividualBusinessLendingLoans
Namespace Prefix: | cbu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cbu_NonaccrualTdrsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cbu_AccruingTdrsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cbu_ConsumerInstallmentIndirectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cbu_ConsumerInstallmentDirectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cbu_HomeEquityReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |