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Investment Securities - Amortized Cost and Fair Value Classified by Contractual Maturity Date on Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investment Securities, Available for Sale, Amortized Cost, Classified by Contractual Maturity Date    
Due in one year or less $ 14,139  
Due after one year through five years 4,983  
Due after five years through ten years 43,247  
Due after ten years 91,927  
Total investment securities due at a single maturity date 154,296  
MBS 1,138,204  
Investment Securities, Available-for-Sale, Amortized Cost, Total 1,292,500  
Investment Securities, Available for Sale, Fair Value, Classified by Contractual Maturity    
Due in one year or less 14,016  
Due after one year through five years 4,714  
Due after five years through ten years 38,366  
Due after ten years 73,913  
Total investment securities due at a single maturity date 131,009  
MBS 1,016,538  
Investment Securities, Available-for-Sale, Fair Value, Total 1,147,547  
Investment Securities, Held to Maturity, Amortized Cost, Classified by Contractual Maturity Date    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 83,252  
Due after ten years 67,788  
Total investment securities due at a single maturity date 151,040  
MBS(1) 595,805  
Investment Securities, Held-to-Maturity, Amortized Cost, Total 746,845 $ 766,396
Investment Securities, Held for Sale, Fair Value, Classified by Contractual Maturity    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 66,660  
Due after ten years 49,159  
Total investment securities due at a single maturity date 115,819  
MBS(1) 520,438  
Investment Securities, Held-to-Maturity, Fair Value, Total $ 636,257 $ 673,434