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INVESTMENT SECURITIES- Investment Portfolio Composition (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 321,191 | $ 402,358
Unrealized Gains | 3,863 | 1,635
Unrealized Losses | 184 | 392
Market Value | 324,870 | 403,601
Federal Home Loan Bank | 2,900 |
Federal Reserve Bank stock | 4,800 |
Held to Maturity |  |
Amortized Cost | 169,939 | 239,539
Unrealized Gains | 5,236 | 2,079
Unrealized Losses | 0 | 189
Market Value | 175,175 | 241,429
Available For Sale Securities And Held To Maturity Securities [Abstract] |  |
Amortized Cost | 491,130 | 641,897
Unrealized Gains | 9,099 | 3,714
Unrealized Loss | 184 | 581
Fair Value | 500,045 | 645,030
U.S. Treasury [Member] |  |
Available-for-sale |  |
Amortized Cost | 103,547 | 231,996
Unrealized Gains | 972 | 849
Unrealized Losses | 0 | 67
Market Value | 104,519 | 232,778
Held to Maturity |  |
Amortized Cost | 5,001 | 20,036
Unrealized Gains | 13 | 15
Unrealized Losses | 0 | 9
Market Value | 5,014 | 20,042
U.S. Government Agency [Member] |  |
Available-for-sale |  |
Amortized Cost | 205,972 | 155,706
Unrealized Gains | 2,743 | 697
Unrealized Losses | 184 | 325
Market Value | 208,531 | 156,078
States and Political Subdivisions [Member] |  |
Available-for-sale |  |
Amortized Cost | 3,543 | 6,310
Unrealized Gains | 89 | 9
Unrealized Losses | 0 | 0
Market Value | 3,632 | 6,319
Held to Maturity |  |
Amortized Cost | 0 | 1,376
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 0 | 1,376
Mortgage-Backed Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 456 | 693
Unrealized Gains | 59 | 80
Unrealized Losses | 0 |
Market Value | 515 | 773
Held to Maturity |  |
Amortized Cost | 164,938 | 218,127
Unrealized Gains | 5,223 | 2,064
Unrealized Losses | 0 | 180
Market Value | 170,161 | 220,011
Equity Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 7,673 | 7,653
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Market Value | $ 7,673 | $ 7,653

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