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INVESTMENT SECURITIES - Maturity of Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due in one year or less $ 0 $ 0
Due after one year through five years 4,300 200
Due after five years through ten years 3,800 400
Total securities with contractual maturities 8,100 600
Mortgage backed securities 49,319 42,951
Total held to maturity securities 57,419 43,551
Estimated Fair Value    
Due in one year or less 0 0
Due after one year through five years 4,300 200
Due after five years through ten years 3,776 402
Total securities with contractual maturities 8,076 602
Mortgage backed securities 47,710 43,182
Total held to maturity securities $ 55,786 $ 43,784