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Investments (Amortized Cost and Fair Values of HTM Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Held-to-maturity, Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 863  
Due after five years through ten years 22,701  
Due after ten years 60,544  
Held-to-Maturity, Amortized Cost 84,108  
Mortgage-related securities 462,475  
HTM debt securities 546,583 $ 1,291
Held-to-maturity, Fair Value    
Due in one year or less 0  
Due after one year through five years 855  
Due after five years through ten years 21,711  
Due after ten years 59,642  
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value 82,208  
Mortgage-related securities 423,985  
Debt Securities, Held-to-maturity, Fair Value $ 506,193 $ 1,380