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Regulatory Matters (Tables)
12 Months Ended
Dec. 31, 2022
Banking Regulation [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
The Company’s and the Bank’s capital levels and regulatory 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
December 31, 2022AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,799,020 10.55 %$767,223 4.50 %$1,193,459 7.00 % N/A  N/A
Bank$2,049,973 12.03 %$766,971 4.50 %$1,193,066 7.00 %$1,107,847 6.50 %
Total capital
(to risk-weighted assets):
Company$2,041,319 11.97 %$1,363,953 8.00 %$1,790,188 10.50 % N/A  N/A
Bank$2,189,607 12.85 %$1,363,504 8.00 %$1,789,598 10.50 %$1,704,380 10.00 %
Tier 1 capital
(to risk-weighted assets):
Company$1,901,685 11.15 %$1,022,965 6.00 %$1,449,200 8.50 % N/A  N/A
Bank$2,049,973 12.03 %$1,022,628 6.00 %$1,448,723 8.50 %$1,363,504 8.00 %
Tier 1 capital
(to average assets):
Company$1,901,685 10.15 %$749,743 4.00 %N/AN/A N/A  N/A
Bank$2,049,973 10.94 %$749,540 4.00 %N/AN/A$936,925 5.00 %
 ActualRequired For Capital Adequacy PurposesMinimum Capital Adequacy
With Capital Conservation Buffer
Required To Be Well Capitalized
Under Prompt Corrective Action Provisions
December 31, 2021AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,657,754 11.03 %$676,633 4.50 %$1,052,540 7.00 %N/AN/A
Bank$1,947,914 12.96 %$676,328 4.50 %$1,052,066 7.00 %$976,919 6.50 %
Total capital
(to risk-weighted assets):
Company$1,867,968 12.42 %$1,202,903 8.00 %$1,578,811 10.50 %N/AN/A
Bank$2,056,675 13.68 %$1,202,361 8.00 %$1,578,099 10.50 %$1,502,952 10.00 %
Tier 1 capital
(to risk-weighted assets):
Company$1,759,207 11.70 %$902,178 6.00 %$1,278,085 8.50 %N/AN/A
Bank$1,947,914 12.96 %$901,771 6.00 %$1,277,509 8.50 %$1,202,361 8.00 %
Tier 1 capital
(to average assets):
Company$1,759,207 10.11 %$695,795 4.00 %N/AN/AN/AN/A
Bank$1,947,914 11.20 %$695,593 4.00 %N/AN/A$869,491 5.00 %