v3.26.1
Loans, Leases and Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]          
Unamortized loan fees $ 127.0   $ 127.0   $ 120.0
Financing receivable, unamortized premium 200.0   200.0   186.0
Loans Past Due 90 Days or More and Still Accruing 303.0   303.0   356.0
Interest income associated with loans on nonaccrual status 10.5 $ 8.0 19.7 $ 16.0  
Modified loans current with contractual payments 164.0   164.0   114.0
Modified loans on nonaccrual status 56.0   56.0   89.0
Amortized cost basis 36.0 1.0 69.0 238.0  
Interest receivable 300.0   300.0   287.0
Loan purchases 1,500.0 755.0 2,500.0 1,100.0  
Loan sales 50.0 161.0 157.0 379.0  
Charge-off 0.0 1.7 6.1 1.7  
Loss on sale of loan   (0.2)   (2.8)  
Residential EBO          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans Past Due 90 Days or More and Still Accruing 248.0   248.0   290.0
Amortized cost basis 222.0 142.0 307.0 287.0  
Interest receivable, allowance 1.2   1.2   1.2
Loan purchases 0.0 175.0 0.0 302.0  
Residential EBO | Financial Asset, Current to 89 Days Past Due          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Modified loans 71.0   71.0   27.0
Residential EBO | Over 90 days Past Due          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Modified loans 43.0   43.0   123.0
Residential          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans Past Due 90 Days or More and Still Accruing 54.0   54.0   51.0
Recorded investment for which formal foreclosure proceedings are in process 102.0   102.0   107.0
CRE - owner occupied          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Loans Past Due 90 Days or More and Still Accruing 0.0   0.0   $ 0.0
CRE - owner occupied | Real Estate Collateral          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Credit quality deterioration, purchase 51.0 $ 0.0 64.0 $ 0.0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Current $ 0.0   $ 0.0