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Note Regulatory capital requirements - Additional Information (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Trust Preferred Securities Subject To Phase Out Provision Of Dodd Frank Act $ 427
Basel III  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%
Trust Preferred Securities That Will Qualify for Tier 2 Treatment $ 427
Capital Conservation Buffer 2.50%
Common Equity Tier 1 Based Capital Minimum Requirement Ratio 6.50%