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Note Regulatory capital requirements (Capital Requirements Basel 3) (Detail)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Capital Required to be Well Capitalized to Risk Weighted Assets         10.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets         5.00%
Basel III          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets         6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets         8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets         10.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets         5.00%
Capital Adequacy Minimum Requirement | Basel III          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets         4.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets         6.00%
Capital Required to be Well Capitalized to Risk Weighted Assets         8.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets         4.00%
Capital Adequacy Minimum Requirement Plus Capital Conservation Buffer | Basel III          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets 7.00% 6.375% 5.75% 5.125%  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.50% 7.875% 7.25% 6.625%  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.50% 9.875% 9.25% 8.625%