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LIMITS ON DIVIDENDS AND OTHER REVENUE SOURCES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
LIMITS ON DIVIDENDS AND OTHER REVENUE SOURCES [Abstract] |
Criteria for the bank to seek approval of the Office of the Comptroller of the Currency (OCC) for the payments dividends | The Company’s ability to pay dividends to its shareholders is largely dependent on the Bank’s ability to pay dividends to the Company. In addition to state law requirements and the capital requirements discussed below, the circumstances under which the Bank may pay dividends are limited by federal statutes, regulations, and policies. For example, as a national bank, the Bank must obtain the approval of the Office of the Comptroller of the Currency (“OCC”) for payments of dividends if the total of all dividends declared in any calendar year would exceed the total of the Bank’s net profits, as defined by applicable regulations, for that year, combined with its retained net profits for the preceding two years.
Undivided profits legally available for the payments of dividends | $ 121 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
Statutory restrictions on the company's banking subsidiary to transfer funds | Such transfer by the Bank to the Company generally is limited in amount to 10% of the Bank's capital and surplus, or 20% in the aggregate. Furthermore, such loans and extensions of credit are required to be collateralized in specific amounts.
Percentage of Bank's capital and surplus that can be transferred to Company, maximum (in hundredths) | 10.00%cbu_BankCapitalAndSurplusTransferableToCompanyMaximum
Aggregate percentage of Bank's capital and surplus that can be transferred to Company, maximum (in hundredths) | 20.00%cbu_AggregateBankCapitalAndSurplusTransferableToCompanyMaximum

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- Definition The aggregate maximum percentage of the Bank's capital and surplus that can be transferred to Company. + References No definition available. + Details
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- Definition The maximum percentage of the Bank's capital and surplus that can be transferred to Company. + References No definition available. + Details
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- Details
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- Definition Statement regarding federal and state laws and regulations related to restrictions on banking or savings institution's ability to pay dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Statement regarding restrictions on banking or savings institution's ability to extend credit or otherwise supply funds to affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of dividends available for payment after computation of statutory restrictions on capital surplus. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + Details
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