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INVESTMENT SECURITIES - Investment Securities (Details) - Available-for-sale Securities - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Available-for-sale Securities, Amortized Cost Amount | $ 417,348 | $ 384,807
Available-for-sale Securities, Gross Unrealized Gain | 18,241 | 31,338
Available-for-sale Securities, Gross Unrealized Loss | 2,651 | 1,212
Available-for-sale Securities, Fair Value | 432,938 | 414,933
Agency mortgage-backed securities. |  |
Available-for-sale Securities, Amortized Cost Amount | 157,316 | 151,106
Available-for-sale Securities, Gross Unrealized Gain | 12,402 | 19,665
Available-for-sale Securities, Gross Unrealized Loss | 898 | 831
Available-for-sale Securities, Fair Value | 168,820 | 169,940
Agency collateralized mortgage obligations |  |
Available-for-sale Securities, Amortized Cost Amount | 203,680 | 168,472
Available-for-sale Securities, Gross Unrealized Gain | 3,688 | 8,524
Available-for-sale Securities, Gross Unrealized Loss | 1,637 | 375
Available-for-sale Securities, Fair Value | 205,731 | 176,621
States and political subdivisions securities |  |
Available-for-sale Securities, Amortized Cost Amount | 38,571 | 45,196
Available-for-sale Securities, Gross Unrealized Gain | 1,582 | 2,135
Available-for-sale Securities, Gross Unrealized Loss | 116 | 6
Available-for-sale Securities, Fair Value | 40,037 | 47,325
Small Business Administration securities |  |
Available-for-sale Securities, Amortized Cost Amount | 17,781 | 20,033
Available-for-sale Securities, Gross Unrealized Gain | 569 | 1,014
Available-for-sale Securities, Fair Value | $ 18,350 | $ 21,047

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