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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

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