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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investments Available-for-Sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Amortized Cost    
Total investment securities available-for-sale $ 1,330,077 $ 1,408,935
Estimated Fair Value    
Less: allowance for credit losses 0 (22)
Total investment securities available-for-sale 1,214,237  
Amortized Cost    
Less: allowance for credit losses (1,275) (1,306)
Total investment securities held-to-maturity 924,473 938,647
Estimated Fair Value    
Total investment securities held-to-maturity 820,530 820,382
Asset-Backed Securities    
Amortized Cost    
Within one year 156,396  
One to five years 340,645  
Five to ten years 65,175  
Beyond ten years 19,334  
Estimated Fair Value    
Within one year 153,945  
One to five years 319,023  
Five to ten years 58,051  
Beyond ten years 16,618  
Amortized Cost    
Within one year 6,948  
One to five years 64,904  
Five to ten years 118,431  
Beyond ten years 55,159  
Less: allowance for credit losses (1,275)  
Total investment securities held-to-maturity 924,473  
Total 2,254,550  
Estimated Fair Value    
Within one year 6,925  
One to five years 63,184  
Five to ten years 107,829  
Beyond ten years 48,746  
Total investment securities held-to-maturity 820,530  
Total 2,034,767  
Residential mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 695,732  
Total investment securities available-for-sale 695,732 719,815
Estimated Fair Value    
Estimated fair value, without maturity date 617,394  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 592,109  
Estimated Fair Value    
Estimated fair value, without maturity date 517,134  
Total investment securities held-to-maturity 517,134 519,963
Commercial mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 52,795  
Total investment securities available-for-sale 52,795 53,248
Estimated Fair Value    
Estimated fair value, without maturity date 49,206  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 88,197  
Estimated Fair Value    
Estimated fair value, without maturity date 76,712  
Total investment securities held-to-maturity $ 76,712 $ 75,506