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Regulatory Capital Requirements - Actual Capital Amounts and Ratios and FDIC Minimum Capital Adequacy Requirements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
FRB [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, Actual Amount $ 887,924 $ 835,282
Tier 1 leverage capital, Actual Ratio 9.65% 9.25%
Tier 1 leverage capital, minimum capital adequacy requirements, Amount $ 367,999 $ 361,183
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio 4.00% 4.00%
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, Amount $ 367,999 $ 361,183
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, Ratio 4.00% 4.00%
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Amount $ 459,999 $ 451,479
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, Actual Amount $ 887,924 $ 835,282
Common equity Tier 1 risk-based capital, Actual Ratio 11.87% 11.64%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, Amount $ 336,736 $ 323,048
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, Ratio 4.50% 4.50%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, Amount $ 430,260 $ 367,916
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, Ratio 5.75% 5.125%
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 486,381 $ 466,625
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio 6.50% 6.50%
Tier 1 risk-based capital, Actual Amount $ 887,924 $ 835,282
Tier 1 risk-based capital, Actual Ratio 11.87% 11.64%
Tier 1 risk-based capital, minimum capital adequacy requirements, Amount $ 448,981 $ 430,731
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio 6.00% 6.00%
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 542,502 $ 475,599
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 7.25% 6.625%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 598,623 $ 574,308
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio 8.00% 8.00%
Total risk-based capital, Actual Amount $ 948,119 $ 897,165
Total risk-based capital, Actual Ratio 12.67% 12.50%
Total risk-based capital, minimum capital adequacy requirements, Amount $ 598,642 $ 574,308
Total risk-based capital, minimum capital adequacy requirements, Ratio 8.00% 8.00%
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 692,157 $ 619,176
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 9.25% 8.625%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Amount $ 748,278 $ 717,885
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio 10.00% 10.00%
FDIC [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, Actual Amount $ 834,084 $ 760,708
Tier 1 leverage capital, Actual Ratio 9.07% 8.42%
Tier 1 leverage capital, minimum capital adequacy requirements, Amount $ 367,986 $ 361,172
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio 4.00% 4.00%
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, Amount $ 367,986 $ 361,172
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, Ratio 4.00% 4.00%
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Amount $ 459,983 $ 451,465
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, Actual Amount $ 834,084 $ 760,708
Common equity Tier 1 risk-based capital, Actual Ratio 11.15% 10.60%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, Amount $ 336,721 $ 323,040
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, Ratio 4.50% 4.50%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, Amount $ 430,254 $ 367,907
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, Ratio 5.75% 5.125%
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 486,374 $ 466,613
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio 6.50% 6.50%
Tier 1 risk-based capital, Actual Amount $ 834,084 $ 760,708
Tier 1 risk-based capital, Actual Ratio 11.15% 10.60%
Tier 1 risk-based capital, minimum capital adequacy requirements, Amount $ 448,961 $ 430,720
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio 6.00% 6.00%
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 542,494 $ 475,587
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 7.25% 6.625%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 598,615 $ 574,293
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio 8.00% 8.00%
Total risk-based capital, Actual Amount $ 894,430 $ 822,743
Total risk-based capital, Actual Ratio 11.95% 11.46%
Total risk-based capital, minimum capital adequacy requirements, Amount $ 598,615 $ 574,293
Total risk-based capital, minimum capital adequacy requirements, Ratio 8.00% 8.00%
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 692,148 $ 619,160
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 9.25% 8.625%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Amount $ 748,268 $ 717,867
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio 10.00% 10.00%