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Regulatory Matters (Tables)
3 Months Ended
Mar. 31, 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:
 ActualRequired For Capital Adequacy PurposesMinimum Capital Adequacy
With Capital Conservation Buffer
Required To Be Well Capitalized
Under Prompt Corrective Action Provisions
As of March 31, 2021AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,588,161 11.08 %$645,247 4.50 %$1,003,718 7.00 % N/A  N/A
Bank$1,878,163 13.10 %$644,970 4.50 %$1,003,286 7.00 %$931,623 6.50 %
Total capital
(to risk-weighted assets):
Company$1,867,993 13.03 %$1,147,106 8.00 %$1,505,577 10.50 % N/A  N/A
Bank$2,057,351 14.35 %$1,146,613 8.00 %$1,504,929 10.50 %$1,433,266 10.00 %
Tier 1 capital
(to risk-weighted assets):
Company$1,688,728 11.78 %$860,330 6.00 %$1,218,800 8.50 % N/A  N/A
Bank$1,878,163 13.10 %$859,960 6.00 %$1,218,276 8.50 %$1,146,613 8.00 %
Tier 1 capital
(to average assets):
Company$1,688,728 10.15 %$665,230 4.00 %N/AN/A N/A  N/A
Bank$1,878,163 11.29 %$665,200 4.00 %N/AN/A$831,501 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 %