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Regulatory Matters (Tables)
6 Months Ended
Jun. 30, 2023
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:
 ActualRatio Required for Capital Adequacy PurposesRatio Required To Be Well-CapitalizedRatio Required for Minimum Capital Adequacy With Capital Conservation Buffer
June 30, 2023AmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,839,586 11.05 %4.50 % N/A 7.00 %
Bank$1,905,339 11.46 %4.50 %6.50 %7.00 %
Total capital
(to risk-weighted assets):
Company$2,102,625 12.64 %8.00 % N/A 10.50 %
Bank$2,065,091 12.42 %8.00 %10.00 %10.50 %
Tier 1 capital
(to risk-weighted assets):
Company$1,942,873 11.68 %6.00 % N/A 8.50 %
Bank$1,905,339 11.46 %6.00 %8.00 %8.50 %
Leverage capital
(to average assets):
Company$1,942,873 9.57 %4.00 % N/A N/A
Bank$1,905,339 9.39 %4.00 %5.00 %N/A

 ActualRatio Required for Capital Adequacy PurposesRatio Required To Be Well-CapitalizedRatio Required for Minimum Capital Adequacy With Capital Conservation Buffer
December 31, 2022AmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,799,020 10.55 %4.50 %N/A7.00 %
Bank$2,049,973 12.03 %4.50 %6.50 %7.00 %
Total capital
(to risk-weighted assets):
Company$2,041,319 11.97 %8.00 %N/A10.50 %
Bank$2,189,607 12.85 %8.00 %10.00 %10.50 %
Tier 1 capital
(to risk-weighted assets):
Company$1,901,685 11.15 %6.00 %N/A8.50 %
Bank$2,049,973 12.03 %6.00 %8.00 %8.50 %
Leverage capital
(to average assets):
Company$1,901,685 10.15 %4.00 %N/AN/A
Bank$2,049,973 10.94 %4.00 %5.00 %N/A