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Variable Interest Entities - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Tax Credit Structures
Sep. 30, 2014
Tax Credit Structures
Dec. 31, 2013
Tax Credit Structures
Sep. 30, 2014
Leveraged Leasing Transactions
Dec. 31, 2013
Leveraged Leasing Transactions
Sep. 30, 2014
Leveraged Leasing Transactions
Lower Limit
Sep. 30, 2013
Leveraged Leasing Transactions
Lower Limit
Sep. 30, 2014
Leveraged Leasing Transactions
Upper Limit
Sep. 30, 2013
Leveraged Leasing Transactions
Upper Limit
Variable Interest Entity [Line Items]                  
Funding of asset's cost via an equity interest           20.00% 20.00% 30.00% 30.00%
Funding of asset's cost via third party non recourse debt holders           70.00% 70.00% 80.00% 80.00%
Carrying amounts $ 224,100,000 $ 224,100,000 $ 222,300,000 $ 579,100,000 $ 671,200,000        
Exposure to loss from liquidity arrangements and obligations to purchase assets 0 0   0          
Liabilities related to unfunded commitments 27,400,000 27,400,000 19,800,000            
Affordable housing tax credits and other tax benefits $ 14,500,000 $ 43,200,000