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Investment Securities - Schedule of Amortized Cost and Estimated FV of Investments AFS by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Total investment securities available-for-sale $ 1,584,435 $ 1,668,316
Estimated Fair Value    
Less: allowance for credit losses (17) (17)
Total investment securities available-for-sale 1,420,618  
Amortized Cost    
Allowance for credit losses (2,012) (1,956)
Total held-to-maturity securities, net of ACL 982,955 1,015,737
Estimated Fair Value    
Total investment securities held-to-maturity 856,275 901,582
Asset-Backed Securities    
Amortized Cost    
Within one year 188,270  
One to five years 436,685  
Five to ten years 112,249  
Beyond ten years 20,088  
Estimated Fair Value    
Within one year 183,757  
One to five years 401,318  
Five to ten years 97,283  
Beyond ten years 17,224  
Amortized Cost    
Within one year 4,259  
One to five years 61,728  
Five to ten years 122,637  
Beyond ten years 68,630  
Allowance for credit losses (2,012)  
Total held-to-maturity securities, net of ACL 982,955  
Total 2,567,390  
Estimated Fair Value    
Within one year 4,251  
One to five years 59,329  
Five to ten years 106,494  
Beyond ten years 60,820  
Total investment securities held-to-maturity 856,275  
Total 2,276,893  
Residential mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 773,275  
Total investment securities available-for-sale 773,275 823,992
Estimated Fair Value    
Estimated fair value, without maturity date 672,206  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 638,039  
Estimated Fair Value    
Estimated fair value, without maturity date 548,765  
Total investment securities held-to-maturity 548,765 590,063
Commercial mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 53,868  
Total investment securities available-for-sale 53,868 54,557
Estimated Fair Value    
Estimated fair value, without maturity date 48,847  
Less: allowance for credit losses 0 0
Amortized Cost    
Amortized cost, without maturity date 89,674  
Estimated Fair Value    
Estimated fair value, without maturity date 76,616  
Total investment securities held-to-maturity $ 76,616 $ 77,360