v3.26.3
Regulatory Capital - U.S. Basel III Regulatory Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Actual Amount    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 2,958,577 $ 2,929,973
Tier 1 Capital (to Risk-Weighted Assets) 2,958,577 2,929,973
Total Capital (to Risk-Weighted Assets) 3,304,955 3,274,883
Tier 1 Capital (to Average Assets) $ 2,958,577 $ 2,929,973
Actual Ratio    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) 11.20% 11.10%
Tier 1 Capital (to Risk-Weighted Assets) 0.112 0.111
Total Capital (to Risk-Weighted Assets) 0.125 0.124
Tier 1 Capital (to Average Assets) 0.103 0.099
U.S. Basel III Minimum Requirements Plus Buffer, Amount    
Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 1,855,452 $ 1,849,590
Tier 1 Capital (to Risk-Weighted Assets) 2,253,049 2,245,930
Total Capital (to Risk-Weighted Assets) 2,783,178 2,774,384
Tier 1 Capital (to Average Assets) $ 1,147,761 $ 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