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Securities - Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]      
Held to Maturity, amortized cost, due in one year or less $ 27,214    
Held to Maturity, amortized cost, due after one year through five years 45,853    
Held to Maturity, amortized cost, due after five years through ten years 46,427    
Held to Maturity, amortized cost, due after ten years 11,896    
Held to Maturity, amortized cost, subtotal 131,390    
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations 11,854,448    
Held to Maturity, Amortized Cost 11,985,838 $ 12,365,308  
Held to Maturity, fair value, due in one year or less 27,560    
Held to Maturity, fair value, due after one year through five years 45,608    
Held to Maturity, fair value, due after five years through ten years 41,573    
Held to Maturity, fair value, due after ten years 10,885    
Held to Maturity, fair value, subtotal 125,626    
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations 10,352,733    
Held to Maturity, fair value, total 10,478,359 10,984,598 $ 10,984,598
Available for Sale, amortized cost, due after five years through ten years 14,350    
Available for Sale, amortized cost, subtotal 14,350    
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations 303,903    
Available for Sale, Amortized Cost 318,253 440,358  
Available for Sale, fair value, due after five years through ten years 15,845    
Available for Sale, fair value, subtotal 15,845    
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations 299,455    
Available for Sale securities, at fair value $ 315,300 $ 438,588