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Investment Securities - Schedule of Investment in AFS Securities and HTM Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Amortized Cost    
Total investment securities available-for-sale $ 1,008,764  
Estimated Fair Value    
Less: allowance for credit losses 0 $ 0
Total investment securities available-for-sale 930,314  
Held to maturity, allowance for credit loss 907 1,030
Amortized Cost    
Less: allowance for credit losses (907) (1,030)
Total investment securities held-to-maturity 841,273 854,780
Estimated Fair Value    
Total investment securities held-to-maturity 757,238 774,947
Asset-Backed Securities    
Amortized Cost    
Within one year 70,454  
One to five years 226,437  
Five to ten years 27,699  
Beyond ten years 18,171  
Estimated Fair Value    
Within one year 69,447  
One to five years 213,471  
Five to ten years 25,939  
Beyond ten years 16,031  
Held to maturity, allowance for credit loss 907  
Amortized Cost    
Within one year 4,928  
One to five years 71,030  
Five to ten years 98,688  
Beyond ten years 50,975  
Less: allowance for credit losses (907)  
Total investment securities held-to-maturity 841,273  
Total 1,850,037  
Estimated Fair Value    
Within one year 4,925  
One to five years 69,073  
Five to ten years 92,668  
Beyond ten years 46,136  
Total investment securities held-to-maturity 757,238  
Total 1,687,552  
Residential mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity 597,422  
Estimated Fair Value    
Estimated fair value, without maturity 539,310  
Amortized Cost    
Amortized cost, without maturity 531,370  
Estimated Fair Value    
Estimated fair value, without maturity 469,253  
Total investment securities held-to-maturity 469,253 485,566
Commercial mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity 68,581  
Estimated Fair Value    
Estimated fair value, without maturity 66,116  
Amortized Cost    
Amortized cost, without maturity 85,189  
Estimated Fair Value    
Estimated fair value, without maturity 75,183  
Total investment securities held-to-maturity $ 75,183 $ 75,973