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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2025
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:
 ActualRatio Required for Capital Adequacy PurposesRatio Required To Be Well-CapitalizedRatio Required for Minimum Capital Adequacy With Capital Conservation Buffer
December 31, 2025AmountRatio
 (Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
Company$1,904,868 12.27 %4.50 %N/A7.00 %
Bank$1,989,051 12.82 %4.50 %6.50 %7.00 %
Tier 1 capital
(to risk-weighted assets):
Company$2,011,484 12.96 %6.00 %N/A8.50 %
Bank$1,989,051 12.82 %6.00 %8.00 %8.50 %
Total capital
(to risk-weighted assets):
Company$2,171,256 13.99 %8.00 %N/A10.50 %
Bank$2,148,823 13.85 %8.00 %10.00 %10.50 %
Leverage capital
(to average assets):
Company$2,011,484 11.05 %4.00 %N/AN/A
Bank$1,989,051 10.93 %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, 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