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Investment Securities - Schedule of Amortized Cost and Estimated FV of Investments AFS by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized Cost    
Total investment securities available-for-sale $ 1,550,038 $ 1,668,316
Estimated Fair Value    
Less: allowance for credit losses (17) (17)
Total investment securities available-for-sale 1,433,006  
Amortized Cost    
Allowance for credit losses (1,237) (1,956)
Total held-to-maturity securities, net of ACL 961,925 1,015,737
Estimated Fair Value    
Total investment securities held-to-maturity 868,425 901,582
Asset-Backed Securities    
Amortized Cost    
Within one year 226,404  
One to five years 419,569  
Five to ten years 85,553  
Beyond ten years 19,795  
Estimated Fair Value    
Within one year 223,552  
One to five years 394,901  
Five to ten years 76,816  
Beyond ten years 17,493  
Amortized Cost    
Within one year 7,699  
One to five years 57,804  
Five to ten years 118,626  
Beyond ten years 68,561  
Allowance for credit losses (1,237)  
Total held-to-maturity securities, net of ACL 961,925  
Total 2,511,963  
Estimated Fair Value    
Within one year 7,636  
One to five years 56,704  
Five to ten years 107,212  
Beyond ten years 62,673  
Total investment securities held-to-maturity 868,425  
Total 2,301,431  
Residential mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 745,006  
Total investment securities available-for-sale 745,006 823,992
Estimated Fair Value    
Estimated fair value, without maturity date 670,045  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 621,203  
Estimated Fair Value    
Estimated fair value, without maturity date 554,939  
Total investment securities held-to-maturity 554,939 590,063
Commercial mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 53,711  
Total investment securities available-for-sale 53,711 54,557
Estimated Fair Value    
Estimated fair value, without maturity date 50,216  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 89,269  
Estimated Fair Value    
Estimated fair value, without maturity date 79,261  
Total investment securities held-to-maturity $ 79,261 $ 77,360