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MANDATORILY REDEEMABLE PREFERRED SECURITIES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Debt Instrument [Line Items]  
Number of wholly owned, unconsolidated subsidiary trusts 2cbu_NumberOfWhollyOwnedUnconsolidatedSubsidiaryTrusts
Percent ownership of unconsolidated subsidiary trusts (in hundredths) 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Community Statutory Trust III [Member]  
Terms of preferred securities for each trust [Abstract]  
Issuance Date Jul. 31, 2001
Par Amount $ 24.5us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cbu_CommunityStatutoryTrustIiiMember
Variable Interest Rate Basis 3 month LIBOR
Variable Interest Rate, Basis Spread (in hundredths) 3.58%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= cbu_CommunityStatutoryTrustIiiMember
Effective Interest Rate (in hundredths) 3.83%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= cbu_CommunityStatutoryTrustIiiMember
Maturity Date Jul. 31, 2031
Call Price Par
Community Capital Trust IV [Member]  
Terms of preferred securities for each trust [Abstract]  
Issuance Date Dec. 08, 2006
Par Amount $ 75.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cbu_CommunityCapitalTrustIvMember
Variable Interest Rate Basis 3 month LIBOR
Variable Interest Rate, Basis Spread (in hundredths) 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= cbu_CommunityCapitalTrustIvMember
Effective Interest Rate (in hundredths) 1.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= cbu_CommunityCapitalTrustIvMember
Maturity Date Dec. 15, 2036
Call Price Par