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Regulatory Capital Requirements (Tables)
12 Months Ended
Dec. 31, 2020
Regulatory Assets and Liabilities Disclosure [Abstract]  
Actual Capital Amounts and Ratios
The following table shows the Company’s actual capital amounts and ratios as of December 31, 2020 and 2019, compared to the FRB minimum capital adequacy requirements and the FRB requirements for classification as a well-capitalized institution (dollars in thousands).
 Actual capitalFRB minimum capital
adequacy requirements
FRB minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmountRatioAmount    Ratio    Amount    Ratio    
As of December 31, 2020
Tier 1 leverage capital$1,157,505 9.30 %$497,794 4.00 %$497,794 4.00 %$622,243 5.00 %
Common equity Tier 1 risk-based capital1,144,618 10.46 492,359 4.50 765,892 7.00 711,185 6.50 
Tier 1 risk-based capital1,157,505 10.58 656,478 6.00 930,011 8.50 875,305 8.00 
Total risk-based capital1,306,494 11.94 875,305 8.00 1,148,837 10.50 1,094,131 10.00 

 Actual capital
FRB minimum capital
adequacy requirements
FRB minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmount    Ratio    Amount    Ratio    AmountRatio    
As of December 31, 2019
Tier 1 leverage capital$973,214 10.34 %$376,484 4.00 %$376,484 4.00 %$470,605 5.00 %
Common equity Tier 1 risk-based capital973,214 12.74 343,756 4.50 534,732 7.00 496,537 6.50 
Tier 1 risk-based capital973,214 12.74 458,342 6.00 649,317 8.50 611,122 8.00 
Total risk-based capital1,028,879 13.47 611,122 8.00 802,098 10.50 763,903 10.00 
FDIC Minimum Capital Adequacy Requirements
The following table shows the Bank’s actual capital amounts and ratios as of December 31, 2020 and 2019, compared to the FDIC minimum capital adequacy requirements and the FDIC requirements for classification as a well-capitalized institution (dollars in thousands).
 Actual capitalFDIC minimum capital
adequacy requirements
FDIC minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmount    Ratio    Amount    Ratio    Amount    Ratio    
As of December 31, 2020
Tier 1 leverage capital$1,086,589 8.75 %$496,908 4.00 %$496,908 4.00 %$621,135 5.00 %
Common equity Tier 1 risk-based capital 1,086,589 9.96 491,135 4.50 763,988 7.00 709,417 6.50 
Tier 1 risk-based capital1,086,589 9.96 654,847 6.00 927,700 8.50 873,129 8.00 
Total risk-based capital1,223,469 11.21 873,129 8.00 1,145,982 10.50 1,091,411 10.00 
 
 Actual capital
FDIC minimum capital
adequacy requirements
FRB minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmount    Ratio    Amount    Ratio    Amount    Ratio    
As of December 31, 2019
Tier 1 leverage capital$923,471 9.81 %$376,449 4.00 %$376,449 4.00 %$470,562 5.00 %
Common equity Tier 1 risk-based capital923,471 12.09 343,716 4.50 534,670 7.00 496,479 6.50 
Tier 1 risk-based capital923,471 12.09 458,288 6.00 649,242 8.50 611,051 8.00 
Total risk-based capital979,136 12.82 611,051 8.00 802,004 10.50 763,814 10.00