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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating activities: |  |  |
Net income | $ 91,353 us-gaap_NetIncomeLoss | $ 78,829 us-gaap_NetIncomeLoss | $ 77,068 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 13,082 us-gaap_Depreciation | 12,236 us-gaap_Depreciation | 11,482 us-gaap_Depreciation
Amortization of intangible assets | 4,287 us-gaap_AmortizationOfIntangibleAssets | 4,469 us-gaap_AmortizationOfIntangibleAssets | 4,607 us-gaap_AmortizationOfIntangibleAssets
Net accretion/amortization on securities, loans and borrowings | (3,533)cbu_AccretionAmortizationOnInvestmentsLoansAndBorrowings | (5,959)cbu_AccretionAmortizationOnInvestmentsLoansAndBorrowings | (9,379)cbu_AccretionAmortizationOnInvestmentsLoansAndBorrowings
Stock-based compensation | 3,993 us-gaap_ShareBasedCompensation | 3,961 us-gaap_ShareBasedCompensation | 3,668 us-gaap_ShareBasedCompensation
Provision for loan losses | 7,178 us-gaap_ProvisionForLoanAndLeaseLosses | 7,992 us-gaap_ProvisionForLoanAndLeaseLosses | 9,108 us-gaap_ProvisionForLoanAndLeaseLosses
Provision for deferred income taxes | 7,461 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 7,130 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 12,032 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Amortization of mortgage servicing rights | 444 us-gaap_AmortizationOfMortgageServicingRightsMSRs | 529 us-gaap_AmortizationOfMortgageServicingRightsMSRs | 687 us-gaap_AmortizationOfMortgageServicingRightsMSRs
Income from bank-owned life insurance policies | (1,037)us-gaap_BankOwnedLifeInsuranceIncome | (1,066)us-gaap_BankOwnedLifeInsuranceIncome | (1,121)us-gaap_BankOwnedLifeInsuranceIncome
Gain on sales of investment securities, net | 0 us-gaap_MarketableSecuritiesRealizedGainLoss | (80,768)us-gaap_MarketableSecuritiesRealizedGainLoss | (291)us-gaap_MarketableSecuritiesRealizedGainLoss
Loss on debt extinguishments | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 87,336 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt
Net (gain) loss on sale of loans and other assets | (154)cbu_NetGainOnSaleOfLoansAndOtherAssets | 257 cbu_NetGainOnSaleOfLoansAndOtherAssets | 247 cbu_NetGainOnSaleOfLoansAndOtherAssets
Net change in loans originated for sale | 137 us-gaap_IncreaseDecreaseInLoansHeldForSale | (515)us-gaap_IncreaseDecreaseInLoansHeldForSale | 608 us-gaap_IncreaseDecreaseInLoansHeldForSale
Change in other assets and liabilities | (10)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (11,247)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (292)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities | 123,201 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 103,184 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 108,424 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities: |  |  |
Proceeds from sales of available-for-sale investment securities | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 713,694 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 5,378 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from sales of held-to-maturity investment securities | 0 us-gaap_ProceedsFromSaleOfHeldToMaturitySecurities | 450,032 us-gaap_ProceedsFromSaleOfHeldToMaturitySecurities | 0 us-gaap_ProceedsFromSaleOfHeldToMaturitySecurities
Proceeds from maturities of available-for-sale investment securities | 137,282 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 234,021 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 215,223 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from maturities of held-to-maturity investment securities | 0 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities | 31,595 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities | 28,340 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Proceeds from maturities of other securities | 13 us-gaap_ProceedsFromSaleOfOtherInvestments | 26,649 us-gaap_ProceedsFromSaleOfOtherInvestments | 278 us-gaap_ProceedsFromSaleOfOtherInvestments
Purchases of available-for-sale investment securities | (310,517)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (923,588)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (752,891)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Purchases of held-to-maturity investment securities | 0 us-gaap_PaymentsToAcquireHeldToMaturitySecurities | (8,308)us-gaap_PaymentsToAcquireHeldToMaturitySecurities | (110,925)us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Purchases of other securities | (7,500)us-gaap_PaymentsToAcquireOtherInvestments | 0 us-gaap_PaymentsToAcquireOtherInvestments | (615)us-gaap_PaymentsToAcquireOtherInvestments
Net change in loans | (137,207)cbu_PaymentsForProceedsFromOriginationLoansReceivable | (248,962)cbu_PaymentsForProceedsFromOriginationLoansReceivable | (239,174)cbu_PaymentsForProceedsFromOriginationLoansReceivable
Cash received for acquisitions, net of cash acquired of $0, $291,990, and $5,510, respectively | (924)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 291,980 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 600,972 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchases of premises and equipment, net | (13,376)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (13,855)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (10,846)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash (used in)/provided by investing activities | (332,229)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 553,258 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (264,260)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities: |  |  |
Net change in deposits | 39,220 us-gaap_IncreaseDecreaseInDeposits | (35,451)us-gaap_IncreaseDecreaseInDeposits | 34,832 us-gaap_IncreaseDecreaseInDeposits
Net change in borrowings, net of payments of $13, $815,384 and $220 | 196,087 us-gaap_ProceedsFromRepaymentsOfDebt | (673,484)us-gaap_ProceedsFromRepaymentsOfDebt | (220)us-gaap_ProceedsFromRepaymentsOfDebt
Issuance of common stock | 9,989 us-gaap_ProceedsFromIssuanceOfCommonStock | 15,239 us-gaap_ProceedsFromIssuanceOfCommonStock | 64,145 us-gaap_ProceedsFromIssuanceOfCommonStock
Purchases of treasury stock | (4,368)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Sales of treasury stock | 959 us-gaap_ProceedsFromSaleOfTreasuryStock | 0 us-gaap_ProceedsFromSaleOfTreasuryStock | 0 us-gaap_ProceedsFromSaleOfTreasuryStock
Cash dividends paid | (46,178)us-gaap_PaymentsOfDividendsCommonStock | (43,482)us-gaap_PaymentsOfDividendsCommonStock | (40,765)us-gaap_PaymentsOfDividendsCommonStock
Tax benefits from share-based payment arrangements | 2,068 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 1,825 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 1,524 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by/(used in) financing activities | 197,777 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (735,353)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 59,516 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Change in cash and cash equivalents | (11,251)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (78,911)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (96,320)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 149,647 us-gaap_CashAndCashEquivalentsAtCarryingValue | 228,558 us-gaap_CashAndCashEquivalentsAtCarryingValue | 324,878 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 138,396 us-gaap_CashAndCashEquivalentsAtCarryingValue | 149,647 us-gaap_CashAndCashEquivalentsAtCarryingValue | 228,558 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information: |  |  |
Cash paid for interest | 11,937 us-gaap_InterestPaidNet | 30,141 us-gaap_InterestPaidNet | 51,541 us-gaap_InterestPaidNet
Cash paid for income taxes | 29,457 us-gaap_IncomeTaxesPaid | 23,648 us-gaap_IncomeTaxesPaid | 16,462 us-gaap_IncomeTaxesPaid
Supplemental disclosures of noncash financing and investing activities: |  |  |
Dividends declared and unpaid | 12,254 us-gaap_DividendsPayableCurrentAndNoncurrent | 11,332 us-gaap_DividendsPayableCurrentAndNoncurrent | 10,699 us-gaap_DividendsPayableCurrentAndNoncurrent
Transfers from loans to other real estate | 2,546 us-gaap_TransferToOtherRealEstate | 8,325 us-gaap_TransferToOtherRealEstate | 5,059 us-gaap_TransferToOtherRealEstate
Transfer of investment securities from held-to-maturity to available-for-sale | 0 cbu_TransferOfInvestmentSecuritiesFromHeldToMaturityToAvailableForSale | 198,890 cbu_TransferOfInvestmentSecuritiesFromHeldToMaturityToAvailableForSale | 0 cbu_TransferOfInvestmentSecuritiesFromHeldToMaturityToAvailableForSale
Acquisitions: |  |  |
Fair value of assets acquired, excluding acquired cash and intangibles | 164 us-gaap_FairValueOfAssetsAcquired | 3,678 us-gaap_FairValueOfAssetsAcquired | 165,885 us-gaap_FairValueOfAssetsAcquired
Fair value of liabilities assumed | $ 0 us-gaap_LiabilitiesAssumed1 | $ 303,494 us-gaap_LiabilitiesAssumed1 | $ 798,031 us-gaap_LiabilitiesAssumed1

X
- Definition The sum of periodic adjustments charged to earnings related to investment securities, loans and borrowings. As a noncash item this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases and other assets that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_TransferToOtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration