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Regulatory Capital Requirements (Tables)
12 Months Ended
Dec. 31, 2024
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule of Actual Capital Amounts and Ratios
The following table shows the Company’s actual capital amounts and ratios as of December 31, 2024 and 2023, compared to the FRB minimum capital adequacy requirements and the FRB requirements for classification as a well-capitalized institution (dollars in thousands).
 Actual capitalFRB minimum capital
adequacy requirements
FRB minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmountRatioAmount    Ratio    Amount    Ratio    
As of December 31, 2024
Tier 1 leverage capital$1,984,052 8.50 %$933,491 4.00 %$933,491 4.00 %$1,166,864 5.00 %
Common equity Tier 1 risk-based capital1,984,052 9.98 894,957 4.50 1,392,156 7.00 1,292,716 6.50 
Tier 1 risk-based capital1,984,052 9.98 1,193,276 6.00 1,690,475 8.50 1,591,035 8.00 
Total risk-based capital2,614,625 13.15 1,591,035 8.00 2,088,233 10.50 1,988,794 10.00 
 Actual capital
FRB minimum capital
adequacy requirements
FRB minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmount    Ratio    Amount    Ratio    AmountRatio    
As of December 31, 2023
Tier 1 leverage capital$1,396,512 10.22 %$546,662 4.00 %$546,662 4.00 %$683,327 5.00 %
Common equity Tier 1 risk-based capital1,383,625 11.45 543,720 4.50 845,786 7.00 785,373 6.50 
Tier 1 risk-based capital1,396,512 11.56 724,959 6.00 1,027,026 8.50 966,612 8.00 
Total risk-based capital1,496,545 12.39 966,612 8.00 1,268,679 10.50 1,208,266 10.00 
Schedule of FDIC Minimum Capital Adequacy Requirements
The following table shows the Bank’s actual capital amounts and ratios as of December 31, 2024 and 2023, compared to the FDIC minimum capital adequacy requirements and the FDIC requirements for classification as a well-capitalized institution (dollars in thousands).
 Actual capitalFDIC minimum capital
adequacy requirements
FDIC minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmount    Ratio    Amount    Ratio    Amount    Ratio    
As of December 31, 2024
Tier 1 leverage capital$2,265,907 9.72 %$932,593 4.00 %$932,593 4.00 %$1,165,742 5.00 %
Common equity Tier 1 risk-based capital 2,265,907 11.42 892,544 4.50 1,388,402 7.00 1,289,231 6.50 
Tier 1 risk-based capital2,265,907 11.42 1,190,059 6.00 1,685,917 8.50 1,586,745 8.00 
Total risk-based capital2,458,799 12.40 1,586,745 8.00 2,082,603 10.50 1,983,432 10.00 
 
 Actual capital
FDIC minimum capital
adequacy requirements
FRB minimum capital
adequacy requirements with capital conservation buffer
To be well-capitalized
under prompt corrective
action provisions
 AmountRatioAmount    Ratio    Amount    Ratio    Amount    Ratio    
As of December 31, 2023
Tier 1 leverage capital$1,343,223 9.84 %$546,168 4.00 %$546,168 4.00 %$682,709 5.00 %
Common equity Tier 1 risk-based capital1,343,223 11.12 543,465 4.50 845,390 7.00 785,005 6.50 
Tier 1 risk-based capital1,343,223 11.12 724,620 6.00 1,026,545 8.50 966,160 8.00 
Total risk-based capital1,443,256 11.95 966,160 8.00 1,268,085 10.50 1,207,700 10.00