v3.26.3
Investment Securities (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2026
USD ($)
rental
security
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Number of positions | security 462  
Number of securities which impairment considered insignificant | security 109  
Available-for-sale securities, gross unrealized loss, considered insignificant | $ $ 0.9  
Securities in unrealized loss position | $ 453.1 $ 267.1
Accumulated gross unrealized gain (loss) | $ 186.0  
Available-for-sale Securities    
Debt Securities, Available-for-sale [Line Items]    
Interest receivable | $ 29.0 30.0
Securities pledged as collateral | $ $ 5,500.0 $ 8,000.0
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 15  
U.S. Government agency and sponsored enterprise residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 106  
U.S. Government agency and sponsored enterprise commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 35  
SBA securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 12  
Private label residential MBS and CMOs    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 147  
Percentage of weighted average collateral loss 3.30%  
Percentage of weighted average credit support 18.90%  
Percentage of securities rated AA 2.00%  
Percentage of securities rated A 10.00%  
Percentage of securities not rated 2.00%  
Private label commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 19  
Percentage of weighted average collateral loss 8.30%  
Percentage of weighted average credit support 38.40%  
Percentage of securities rated AAA 80.00%  
Percentage of securities rated AA 2.00%  
Percentage of securities rated A 18.00%  
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 7  
Percentage of weighted average collateral loss 14.60%  
Percentage of weighted average credit support 41.00%  
Percentage of securities rated AAA 84.00%  
Percentage of securities rated AA 16.00%  
Non-mortgage asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 3  
Percentage of weighted average collateral loss 3.30%  
Percentage of weighted average credit support 40.20%  
Percentage of securities rated AAA 19.00%  
Percentage of securities rated AA 81.00%  
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 9  
Percentage of securities rated AAA 7.00%  
Percentage of securities rated AA 88.00%  
Percentage of securities rated A 5.00%