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Variable Interest Entities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entities    
Affordable housing investments $ 203,010,000cyn_AffordableHousingInvestments $ 188,207,000cyn_AffordableHousingInvestments
Affordable Housing VIEs - not primary beneficiary    
Variable Interest Entities    
Affordable housing investments 203,000,000cyn_AffordableHousingInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 188,200,000cyn_AffordableHousingInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember
Unfunded commitments for affordable housing investments 66,100,000cyn_UnfundedCommitmentsAffordableHousingInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		  
Aggregate carrying value of private equity and alternative investment funds $ 29,200,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 $ 34,000,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember