XML 56 R44.htm IDEA: XBRL DOCUMENT
v3.22.1

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Aged analysis of the company's loans |  |
Total loans | $ 7,422,253 | $ 7,373,639
Interest income on nonaccrual loans | 0 |
Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 62,050 | 73,495
Nonaccrual | 32,213 | 41,665
Total loans | 7,422,253 | 7,373,639
Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 26,021 |
Total loans |  | 28,022
Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 3,816 | 3,808
Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 7,360,203 | 7,300,144
Business Lending |  |
Aged analysis of the company's loans |  |
Total past due | 3,102,533 | 3,075,904
Consumer Mortgage |  |
Aged analysis of the company's loans |  |
Total past due | 2,592,586 | 2,556,114
Consumer Indirect |  |
Aged analysis of the company's loans |  |
Total past due | 1,176,373 | 1,189,749
Consumer Direct |  |
Aged analysis of the company's loans |  |
Total past due | 152,445 | 153,811
Home Equity |  |
Aged analysis of the company's loans |  |
Total past due | 398,316 | 398,061
Commercial Portfolio Segment | Business Lending |  |
Aged analysis of the company's loans |  |
Total loans | 3,102,533 | 3,075,904
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 20,755 | 29,744
Nonaccrual | 13,759 | 24,105
Total loans | 3,102,533 | 3,075,904
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 6,957 | 5,540
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 39 | 99
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 3,081,778 | 3,046,160
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 28,387 | 28,652
Nonaccrual | 16,097 | 15,027
Total loans | 2,592,586 | 2,556,114
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 8,768 | 10,297
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 3,522 | 3,328
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 2,564,199 | 2,527,462
Consumer Portfolio Segment | Consumer Mortgage |  |
Aged analysis of the company's loans |  |
Total loans | 2,592,586 | 2,556,114
Consumer Portfolio Segment | Consumer Indirect |  |
Aged analysis of the company's loans |  |
Total loans | 1,176,373 | 1,189,749
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 7,969 | 9,698
Nonaccrual | 0 | 0
Total loans | 1,176,373 | 1,189,749
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 7,936 | 9,611
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 33 | 87
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 1,168,404 | 1,180,051
Consumer Portfolio Segment | Consumer Direct |  |
Aged analysis of the company's loans |  |
Total loans | 152,445 | 153,811
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 751 | 819
Nonaccrual | 1 | 1
Total loans | 152,445 | 153,811
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 750 | 796
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 0 | 22
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 151,694 | 152,992
Consumer Portfolio Segment | Home Equity |  |
Aged analysis of the company's loans |  |
Total loans | 398,316 | 398,061
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 4,188 | 4,582
Nonaccrual | 2,356 | 2,532
Total loans | 398,316 | 398,061
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 1,610 | 1,778
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 222 | 272
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | $ 394,128 | $ 393,479

X
- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=cbu_FinancingReceivables30To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
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: |

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