v3.26.1
Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Actual Amount    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 2,951,103 $ 2,929,973
Tier 1 Capital (to Risk-Weighted Assets) 2,951,103 2,929,973
Total Capital (to Risk-Weighted Assets) 3,277,882 3,274,883
Tier 1 Capital (to Average Assets) $ 2,951,103 $ 2,929,973
Actual Ratio    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) 11.80% 11.10%
Tier 1 Capital (to Risk-Weighted Assets) 0.118 0.111
Total Capital (to Risk-Weighted Assets) 0.131 0.124
Tier 1 Capital (to Average Assets) 0.102 0.099
U.S. Basel III Minimum Requirements Plus Buffer, Amount    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 1,752,917 $ 1,849,590
Tier 1 Capital (to Risk-Weighted Assets) 2,128,543 2,245,930
Total Capital (to Risk-Weighted Assets) 2,629,376 2,774,384
Tier 1 Capital (to Average Assets) $ 1,161,093 $ 1,186,335
U.S. Basel III Minimum Requirements Plus Buffer, Ratio    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) 7.00% 7.00%
Tier 1 Capital (to Risk-Weighted Assets) 0.085 0.085
Total Capital (to Risk-Weighted Assets) 0.105 0.105
Tier 1 Capital (to Average Assets) 0.040 0.040