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Regulatory Capital Requirements - Additional Information (Detail)
12 Months Ended
Jan. 01, 2019
Jan. 01, 2018
Jan. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Capital conservation buffer, percentage of common equity Tier 1 capital to risk-weighted assets       2.50%  
Minimum [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Capital conservation buffer, percentage of common equity Tier 1 capital to risk-weighted assets     0.625% 1.25%  
Maximum [Member] | Scenario, Forecast [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Capital conservation buffer, percentage of common equity Tier 1 capital to risk-weighted assets 2.50%        
FDIC [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio       4.00% 4.00%
Common equity Tier 1 capital to risk-based assets ratio       4.50% 4.50%
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio       6.00% 6.00%
Total risk-based capital, minimum capital adequacy requirements, Ratio       8.00% 8.00%
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Ratio       5.00% 5.00%
Common equity Tier 1 risk-based capital ratio       6.50% 6.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio       8.00% 8.00%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio       10.00% 10.00%
Subsequent Event [Member] | Minimum [Member]          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Capital conservation buffer, percentage of common equity Tier 1 capital to risk-weighted assets   1.875%