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Variable Interest Entities (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Variable Interest Entities    
Affordable housing investments $ 190,347,000cyn_AffordableHousingInvestments $ 186,423,000cyn_AffordableHousingInvestments
Affordable Housing VIEs - not primary beneficiary    
Variable Interest Entities    
Affordable housing investments 190,300,000cyn_AffordableHousingInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember		 186,400,000cyn_AffordableHousingInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember
Unfunded commitments for affordable housing investments 67,800,000cyn_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		 $ 29,200,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember