v3.26.1
Investment Securities (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2026
USD ($)
rental
security
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Number of positions | security 369  
Number of securities which impairment considered insignificant | security 105  
Available-for-sale securities, gross unrealized loss, considered insignificant | $ $ 0.9  
Securities in unrealized loss position | $ 282.3 $ 267.1
Accumulated gross unrealized gain (loss) | $ 15.2  
Available-for-sale Securities    
Debt Securities, Available-for-sale [Line Items]    
Interest receivable | $ 26.0 30.0
Securities pledged as collateral | $ $ 5,600.0 $ 8,000.0
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 12  
U.S. Government agency and sponsored enterprise residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 44  
U.S. Government agency and sponsored enterprise commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 27  
SBA securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 14  
Private label residential MBS and CMOs    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 129  
Percentage of weighted average collateral loss 3.30%  
Percentage of weighted average credit support 19.20%  
Percentage of securities rated AAA 86.00%  
Percentage of securities rated AA 3.00%  
Percentage of securities rated A 9.00%  
Private label commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 17  
Percentage of weighted average collateral loss 7.80%  
Percentage of weighted average credit support 39.30%  
Percentage of securities rated AAA 78.00%  
Percentage of securities rated AA 2.00%  
Percentage of securities rated A 20.00%  
Single family real estate-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 5  
Percentage of weighted average collateral loss 6.20%  
Percentage of weighted average credit support 60.60%  
Percentage of securities rated AAA 54.00%  
Percentage of securities rated AA 46.00%  
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 8  
Percentage of weighted average collateral loss 15.80%  
Percentage of weighted average credit support 41.00%  
Percentage of securities rated AAA 86.00%  
Percentage of securities rated AA 14.00%  
Non-mortgage asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 3  
Percentage of weighted average collateral loss 3.40%  
Percentage of weighted average credit support 37.60%  
Percentage of securities rated AAA 20.00%  
Percentage of securities rated AA 80.00%  
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of positions 5  
Percentage of securities rated AAA 8.00%  
Percentage of securities rated AA 92.00%