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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Interest income: |  |  |
Interest and fees on loans | $ 185,527 us-gaap_InterestAndFeeIncomeLoansAndLeases | $ 188,197 us-gaap_InterestAndFeeIncomeLoansAndLeases | $ 192,710 us-gaap_InterestAndFeeIncomeLoansAndLeases
Interest and dividends on taxable investments | 50,247 us-gaap_InterestIncomeSecuritiesTaxable | 54,995 us-gaap_InterestIncomeSecuritiesTaxable | 65,165 us-gaap_InterestIncomeSecuritiesTaxable
Interest and dividends on nontaxable investments | 20,446 us-gaap_InterestIncomeSecuritiesTaxExempt | 20,967 us-gaap_InterestIncomeSecuritiesTaxExempt | 23,525 us-gaap_InterestIncomeSecuritiesTaxExempt
Total interest income | 256,220 us-gaap_InterestAndDividendIncomeOperating | 264,159 us-gaap_InterestAndDividendIncomeOperating | 281,400 us-gaap_InterestAndDividendIncomeOperating
Interest expense: |  |  |
Interest on deposits | 8,191 us-gaap_InterestExpenseDeposits | 10,732 us-gaap_InterestExpenseDeposits | 18,162 us-gaap_InterestExpenseDeposits
Interest on borrowings | 1,124 us-gaap_InterestExpenseBorrowings | 12,813 us-gaap_InterestExpenseBorrowings | 30,098 us-gaap_InterestExpenseBorrowings
Interest on subordinated debt held by unconsolidated subsidiary trusts | 2,477 us-gaap_InterestExpenseJuniorSubordinatedDebentures | 2,520 us-gaap_InterestExpenseJuniorSubordinatedDebentures | 2,716 us-gaap_InterestExpenseJuniorSubordinatedDebentures
Total interest expense | 11,792 us-gaap_InterestExpense | 26,065 us-gaap_InterestExpense | 50,976 us-gaap_InterestExpense
Net interest income | 244,428 us-gaap_InterestIncomeExpenseNet | 238,094 us-gaap_InterestIncomeExpenseNet | 230,424 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 7,178 us-gaap_ProvisionForLoanAndLeaseLosses | 7,992 us-gaap_ProvisionForLoanAndLeaseLosses | 9,108 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses | 237,250 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 230,102 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 221,316 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income: |  |  |
Deposit service fees | 52,756 us-gaap_FeesAndCommissionsDepositorAccounts | 49,357 us-gaap_FeesAndCommissionsDepositorAccounts | 46,064 us-gaap_FeesAndCommissionsDepositorAccounts
Other banking services | 5,814 cbu_OtherBankingServices | 5,245 cbu_OtherBankingServices | 4,069 cbu_OtherBankingServices
Employee benefit services | 42,580 cbu_EmployeeBenefitServices | 38,596 cbu_EmployeeBenefitServices | 35,946 cbu_EmployeeBenefitServices
Wealth management services | 17,870 cbu_TrustInvestmentAndAssetManagementFees | 15,550 cbu_TrustInvestmentAndAssetManagementFees | 12,876 cbu_TrustInvestmentAndAssetManagementFees
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
Total noninterest income | 119,020 us-gaap_NoninterestIncome | 102,180 us-gaap_NoninterestIncome | 99,246 us-gaap_NoninterestIncome
Noninterest expenses: |  |  |
Salaries and employee benefits | 123,077 us-gaap_LaborAndRelatedExpense | 121,629 us-gaap_LaborAndRelatedExpense | 112,034 us-gaap_LaborAndRelatedExpense
Occupancy and equipment | 27,948 us-gaap_OccupancyNet | 27,045 us-gaap_OccupancyNet | 25,799 us-gaap_OccupancyNet
Data processing and communications | 29,294 us-gaap_CommunicationsAndInformationTechnology | 27,186 us-gaap_CommunicationsAndInformationTechnology | 23,696 us-gaap_CommunicationsAndInformationTechnology
Amortization of intangible assets | 4,287 us-gaap_AmortizationOfIntangibleAssets | 4,469 us-gaap_AmortizationOfIntangibleAssets | 4,607 us-gaap_AmortizationOfIntangibleAssets
Legal and professional fees | 7,247 us-gaap_ProfessionalFees | 7,008 us-gaap_ProfessionalFees | 7,950 us-gaap_ProfessionalFees
Office supplies and postage | 6,270 us-gaap_SuppliesAndPostageExpense | 6,122 us-gaap_SuppliesAndPostageExpense | 5,742 us-gaap_SuppliesAndPostageExpense
Business development and marketing | 7,125 us-gaap_BusinessDevelopment | 6,815 us-gaap_BusinessDevelopment | 5,919 us-gaap_BusinessDevelopment
FDIC insurance premiums | 3,899 us-gaap_FederalDepositInsuranceCorporationPremiumExpense | 3,829 us-gaap_FederalDepositInsuranceCorporationPremiumExpense | 3,804 us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Acquisition expenses | 123 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 2,181 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 5,747 us-gaap_BusinessCombinationAcquisitionRelatedCosts
Other expenses | 17,310 us-gaap_OtherNoninterestExpense | 14,971 us-gaap_OtherNoninterestExpense | 16,459 us-gaap_OtherNoninterestExpense
Total noninterest expenses | 226,580 us-gaap_OperatingExpenses | 221,255 us-gaap_OperatingExpenses | 211,757 us-gaap_OperatingExpenses
Income before income taxes | 129,690 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 111,027 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 108,805 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income taxes | 38,337 us-gaap_IncomeTaxExpenseBenefit | 32,198 us-gaap_IncomeTaxExpenseBenefit | 31,737 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 91,353 us-gaap_NetIncomeLoss | $ 78,829 us-gaap_NetIncomeLoss | $ 77,068 us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share) | $ 2.24 us-gaap_EarningsPerShareBasic | $ 1.96 us-gaap_EarningsPerShareBasic | $ 1.95 us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) | $ 2.22 us-gaap_EarningsPerShareDiluted | $ 1.94 us-gaap_EarningsPerShareDiluted | $ 1.93 us-gaap_EarningsPerShareDiluted

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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 9 + Details
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- Definition Interest expense incurred during the reporting period on junior subordinated debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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