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Regulatory Capital Requirements - Actual Capital Amounts and Ratios and FDIC Minimum Capital Adequacy Requirements (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
FRB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, Actual Amount $ 1,157,505 $ 973,214
Tier 1 leverage capital, Actual Ratio 0.0930 0.1034
Tier 1 leverage capital, minimum capital adequacy requirements, Amount $ 497,794 $ 376,484
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio 0.0400 0.0400
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, Amount $ 497,794 $ 376,484
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 $ 622,243 $ 470,605
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Ratio 0.0500 0.0500
Common equity Tier 1 risk-based capital, Actual Amount $ 1,144,618 $ 973,214
Common equity Tier 1 risk-based capital, Actual Ratio 10.46% 12.74%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, Amount $ 492,359 $ 343,756
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 $ 765,892 $ 534,732
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, Ratio 7.00% 7.00%
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 711,185 $ 496,537
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 $ 1,157,505 $ 973,214
Tier 1 risk-based capital, Actual Ratio 0.1058 0.1274
Tier 1 risk-based capital, minimum capital adequacy requirements, Amount $ 656,478 $ 458,342
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio 0.0600 0.0600
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 930,011 $ 649,317
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 8.50% 8.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 875,305 $ 611,122
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio 0.0800 0.0800
Total risk-based capital, Actual Amount $ 1,306,494 $ 1,028,879
Total risk-based capital, Actual Ratio 0.1194 0.1347
Total risk-based capital, minimum capital adequacy requirements, Amount $ 875,305 $ 611,122
Total risk-based capital, minimum capital adequacy requirements, Ratio 0.0800 0.0800
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 1,148,837 $ 802,098
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 10.50% 10.50%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Amount $ 1,094,131 $ 763,903
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio 0.1000 0.1000
FDIC    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, Actual Amount $ 1,086,589 $ 923,471
Tier 1 leverage capital, Actual Ratio 0.0875 0.0981
Tier 1 leverage capital, minimum capital adequacy requirements, Amount $ 496,908 $ 376,449
Tier 1 leverage capital, minimum capital adequacy requirements, Ratio 0.0400 0.0400
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, Amount $ 496,908 $ 376,449
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 $ 621,135 $ 470,562
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, Ratio 0.0500 0.0500
Common equity Tier 1 risk-based capital, Actual Amount $ 1,086,589 $ 923,471
Common equity Tier 1 risk-based capital, Actual Ratio 9.96% 12.09%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, Amount $ 491,135 $ 343,716
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 $ 763,988 $ 534,670
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, Ratio 7.00% 7.00%
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 709,417 $ 496,479
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 $ 1,086,589 $ 923,471
Tier 1 risk-based capital, Actual Ratio 0.0996 0.1209
Tier 1 risk-based capital, minimum capital adequacy requirements, Amount $ 654,847 $ 458,288
Tier 1 risk-based capital, minimum capital adequacy requirements, Ratio 0.060 0.0600
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 927,700 $ 649,242
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 8.50% 8.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Amount $ 873,129 $ 611,051
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, Ratio 0.0800 0.0800
Total risk-based capital, Actual Amount $ 1,223,469 $ 979,136
Total risk-based capital, Actual Ratio 0.1121 0.1282
Total risk-based capital, minimum capital adequacy requirements, Amount $ 873,129 $ 611,051
Total risk-based capital, minimum capital adequacy requirements, Ratio 0.0800 0.0800
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Amount $ 1,145,982 $ 802,004
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, Ratio 10.50% 10.50%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Amount $ 1,091,411 $ 763,814
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, Ratio 0.1000 0.1000