XML 24 R50.htm IDEA: XBRL DOCUMENT
v3.2.0.727

COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) ClassAction | Dec. 31, 2014 USD ($)
Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Face value disclosure off-balance sheet risks face amount liability | $ 747,236 | $ 747,236 | $ 757,743
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, lower range | 0 | 0 |
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, upper range | 1,000 | $ 1,000 |
Number of class actions in which the Bank is involved | ClassAction |  | 2 |
Legal settlement, amount | 2,800 |  |
Commitments to Extend Credit [Member] |  |  |
Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Face value disclosure off-balance sheet risks face amount liability | 729,174 | $ 729,174 | 733,827
Standby Letters of Credit [Member] |  |  |
Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Face value disclosure off-balance sheet risks face amount liability | $ 18,062 | $ 18,062 | $ 23,916

X
- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability
Namespace Prefix: | cbu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to the number of class actions in which the Bank is involved. + References No definition available. + Details
Name: | cbu_NumberOfClassActionsInWhichTheBankIsInvolved
Namespace Prefix: | cbu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossMinimum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |