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Securities, HTM Debt Securities, Contractual Maturities (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Issuer
Dec. 31, 2022
USD ($)
Issuer
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Within one year $ 88,319  
From one to five years 100,237  
From five to ten years 279,872  
After ten years 446,092  
Amortized cost 914,520 $ 919,517
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Within one year 88,240  
From one to five years 95,052  
From five to ten years 234,309  
After ten years 366,385  
Fair value $ 783,986 $ 812,647
Number of issuers whose holdings exceeded 10% of consolidated stockholders' equity, excluding U.S. Government securities and Government-sponsored enterprises securities | Issuer 0 0