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INVESTMENT SECURITIES - Maturity of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 140 | $ 0
Due after one year through five years | 4,949 | 3,833
Due after five years through ten years | 47,962 | 44,405
Due after ten years | 59,277 | 54,485
Total securities with contractual maturities | 112,328 | 102,723
Amortized Cost | 183,776 | 142,177
Estimated Fair Value |  |
Due in one year or less | 140 | 0
Due after one year through five years | 5,207 | 4,095
Due after five years through ten years | 48,488 | 44,880
Due after ten years | 59,269 | 54,267
Total securities with contractual maturities | 113,104 | 103,242
Total available for sale securities | 185,160 | 144,233
Mortgage backed securities |  |
Amortized Cost |  |
Mortgage backed securities | 71,448 | 39,454
Estimated Fair Value |  |
Mortgage backed securities | $ 72,056 | $ 40,991

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