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Regulatory Matters (Tables)
6 Months Ended
Jun. 30, 2021
Banking Regulation [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
The Company’s and the Bank’s levels and ratios are presented in the tables below for the dates indicated and include the effects of the Company’s election to utilize the five-year transition described above:
 ActualRequired For Capital Adequacy PurposesMinimum Capital Adequacy
With Capital Conservation Buffer
Required To Be Well Capitalized
Under Prompt Corrective Action Provisions
As of June 30, 2021AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,642,492 11.44 %$645,961 4.50 %$1,004,828 7.00 % N/A  N/A
Bank$1,932,546 13.47 %$645,615 4.50 %$1,004,289 7.00 %$932,555 6.50 %
Total capital
(to risk-weighted assets):
Company$1,888,996 13.16 %$1,148,375 8.00 %$1,507,242 10.50 % N/A  N/A
Bank$2,078,189 14.49 %$1,147,759 8.00 %$1,506,434 10.50 %$1,434,699 10.00 %
Tier 1 capital
(to risk-weighted assets):
Company$1,743,353 12.14 %$861,281 6.00 %$1,220,148 8.50 % N/A  N/A
Bank$1,932,546 13.47 %$860,820 6.00 %$1,219,494 8.50 %$1,147,759 8.00 %
Tier 1 capital
(to average assets):
Company$1,743,353 10.43 %$668,540 4.00 %N/AN/A N/A  N/A
Bank$1,932,546 11.56 %$668,416 4.00 %N/AN/A$835,520 5.00 %

 ActualRequired For Capital Adequacy PurposesMinimum Capital Adequacy
With Capital Conservation Buffer
Required To Be Well Capitalized
Under Prompt Corrective Action Provisions
As of December 31, 2020AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,568,508 10.94 %$645,366 4.50 %$1,003,902 7.00 %N/AN/A
Bank$1,850,091 12.90 %$645,277 4.50 %$1,003,764 7.00 %$932,066 6.50 %
Total capital
(to risk-weighted assets):
Company$1,846,229 12.87 %$1,147,317 8.00 %$1,505,853 10.50 %N/AN/A
Bank$2,027,534 14.14 %$1,147,159 8.00 %$1,505,646 10.50 %$1,433,948 10.00 %
Tier 1 capital
(to risk-weighted assets):
Company$1,668,786 11.64 %$860,487 6.00 %$1,219,024 8.50 %N/AN/A
Bank$1,850,091 12.90 %$860,369 6.00 %$1,218,856 8.50 %$1,147,159 8.00 %
Tier 1 capital
(to average assets):
Company$1,668,786 10.22 %$653,163 4.00 %N/AN/AN/AN/A
Bank$1,850,091 11.33 %$653,241 4.00 %N/AN/A$816,551 5.00 %