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SECURITIES - Stratification by Contractual Maturity of Securities (Details) - Debt securities
$ in Thousands
Sep. 30, 2023
USD ($)
Amortized Cost  
Due in one year or less $ 0
Due after one year through five years 21,865
Due after five years through ten years 422,172
Due after ten years 262,151
Amortized Cost 706,188
Fair Value  
Due in one year or less 0
Due after one year through five years 20,940
Due after five years through ten years 400,524
Due after ten years 257,487
Fair Value 678,951
Amortized Cost  
Due in one year or less 3,585
Due after one year through five years 11,000
Due after five years through ten years 610
Due after ten years 0
Amortized Cost 15,195
Fair Value  
Due in one year or less 3,538
Due after one year through five years 10,517
Due after five years through ten years 561
Due after ten years 0
Fair Value $ 14,616