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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
Dec. 31, 2024
Dec. 31, 2023
Amortized Cost    
Total investment securities available-for-sale $ 1,408,935 $ 1,668,316
Estimated Fair Value    
Less: allowance for credit losses (22) (17)
Total investment securities available-for-sale 1,267,404  
Amortized Cost    
Less: allowance for credit losses (1,306) (1,956)
Total investment securities held-to-maturity 938,647 1,015,737
Estimated Fair Value    
Total investment securities held-to-maturity 820,382 901,582
Asset-Backed Securities    
Amortized Cost    
Within one year 188,499  
One to five years 359,242  
Five to ten years 68,580  
Beyond ten years 19,551  
Estimated Fair Value    
Within one year 184,939  
One to five years 331,649  
Five to ten years 59,826  
Beyond ten years 16,751  
Amortized Cost    
Within one year 6,946  
One to five years 64,060  
Five to ten years 105,977  
Beyond ten years 68,491  
Less: allowance for credit losses (1,306)  
Total investment securities held-to-maturity 938,647  
Total 2,347,582  
Estimated Fair Value    
Within one year 6,900  
One to five years 61,728  
Five to ten years 96,087  
Beyond ten years 60,198  
Total investment securities held-to-maturity 820,382  
Total 2,087,786  
Residential mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 719,815  
Total investment securities available-for-sale 719,815 823,992
Estimated Fair Value    
Estimated fair value, without maturity date 625,316  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 605,904  
Estimated Fair Value    
Estimated fair value, without maturity date 519,963  
Total investment securities held-to-maturity 519,963 590,063
Commercial mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 53,248  
Total investment securities available-for-sale 53,248 54,557
Estimated Fair Value    
Estimated fair value, without maturity date 48,945  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 88,575  
Estimated Fair Value    
Estimated fair value, without maturity date 75,506  
Total investment securities held-to-maturity $ 75,506 $ 77,360