v3.26.1
Capital (Tables)
3 Months Ended
Mar. 31, 2026
Banking Regulation, Total Capital [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] The following table summarizes the Bank’s compliance with those capital requirements as of March 31, 2026 and December 31, 2025 (dollars in thousands):
 March 31, 2026December 31, 2025
 RequiredActualRequiredActual
Regulatory capital requirements:    
Risk-based capital$1,237,030 $6,161,658 $1,230,921 $6,573,370 
Total capital$3,882,883 $6,161,658 $4,340,481 $6,573,370 
Total capital-to-assets ratio4.00 %6.35 %4.00 %6.06 %
Leverage capital$4,853,603 $9,242,487 $5,425,601 $9,860,055 
Leverage capital-to-assets ratio5.00 %9.52 %5.00 %9.09 %