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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2024
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:
 ActualRatio Required for Capital Adequacy PurposesRatio Required To Be Well-CapitalizedRatio Required for Minimum Capital Adequacy With Capital Conservation Buffer
December 31, 2024AmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,900,601 13.06 %4.50 %N/A7.00 %
Bank$1,978,969 13.61 %4.50 %6.50 %7.00 %
Tier 1 capital
(to risk-weighted assets):
Company$2,005,840 13.79 %6.00 %N/A8.50 %
Bank$1,978,969 13.61 %6.00 %8.00 %8.50 %
Total capital
(to risk-weighted assets):
Company$2,150,810 14.78 %8.00 %N/A10.50 %
Bank$2,123,939 14.61 %8.00 %10.00 %10.50 %
Leverage capital
(to average assets):
Company$2,005,840 11.83 %4.00 %N/AN/A
Bank$1,978,969 11.68 %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, 2023AmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,869,774 12.28 %4.50 %N/A7.00 %
Bank$1,940,303 12.75 %4.50 %6.50 %7.00 %
Tier 1 capital
(to risk-weighted assets):
Company$1,973,698 12.96 %6.00 %N/A8.50 %
Bank$1,940,303 12.75 %6.00 %8.00 %8.50 %
Total capital
(to risk-weighted assets):
Company$2,120,157 13.92 %8.00 %N/A10.50 %
Bank$2,086,762 13.71 %8.00 %10.00 %10.50 %
Leverage capital
(to average assets):
Company$1,973,698 10.11 %4.00 %N/AN/A
Bank$1,940,303 9.94 %4.00 %5.00 %N/A