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INVESTMENT SECURITIES - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Market Value | $ 28,266 | $ 46,902
Less Than 12 Months, Unrealized Losses | 156 | 244
Greater Than 12 Months, Market Value | 4,670 | 110,674
Greater Than 12 Months, Unrealized Losses | 28 | 148
Total Market Value | 32,936 | 157,576
Total Unrealized Losses | 184 | 392
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value |  | 23,614
Less Than 12 Months, Unrealized Losses |  | 42
Greater Than 12 Months, Market Value |  | 31,049
Greater Than 12 Months Or Longer, Unrealized Losses |  | 147
Total Market Value |  | 54,663
Total Unrealized Losses |  | 189
U.S. Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value |  | 9,955
Less Than 12 Months, Unrealized Losses |  | 0
Greater Than 12 Months, Market Value |  | 93,310
Greater Than 12 Months, Unrealized Losses |  | 67
Total Market Value |  | 103,265
Total Unrealized Losses |  | 67
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value |  | 0
Less Than 12 Months, Unrealized Losses |  | 0
Greater Than 12 Months, Market Value |  | 15,022
Greater Than 12 Months Or Longer, Unrealized Losses |  | 9
Total Market Value |  | 15,022
Total Unrealized Losses |  | 9
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 28,266 | 36,361
Less Than 12 Months, Unrealized Losses | 156 | 244
Greater Than 12 Months, Market Value | 4,670 | 17,364
Greater Than 12 Months, Unrealized Losses | 28 | 81
Total Market Value | 32,936 | 53,725
Total Unrealized Losses | $ 184 | 325
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value |  | 578
Less Than 12 Months, Unrealized Losses |  | 0
Greater Than 12 Months, Market Value |  | 0
Greater Than 12 Months, Unrealized Losses |  | 0
Total Market Value |  | 578
Total Unrealized Losses |  | 0
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value |  | 1,033
Less Than 12 Months, Unrealized Losses |  | 0
Greater Than 12 Months, Market Value |  | 0
Greater Than 12 Months Or Longer, Unrealized Losses |  | 0
Total Market Value |  | 1,033
Total Unrealized Losses |  | 0
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value |  | 8
Less Than 12 Months, Unrealized Losses |  | 0
Greater Than 12 Months, Market Value |  | 0
Greater Than 12 Months, Unrealized Losses |  | 0
Total Market Value |  | 8
Total Unrealized Losses |  | 0
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value |  | 22,581
Less Than 12 Months, Unrealized Losses |  | 42
Greater Than 12 Months, Market Value |  | 16,027
Greater Than 12 Months Or Longer, Unrealized Losses |  | 138
Total Market Value |  | 38,608
Total Unrealized Losses |  | $ 180

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