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INVESTMENT SECURITIES (Schedule of Amortized Cost and Related Market Value of Investment Securities Available-for-Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 367,747 | $ 455,232
Unrealized Gains | 108 | 49
Unrealized Losses | 29,928 | 41,946
Allowance for Credit Loss | (25) | (41)
Fair Value | 337,902 | 413,294
Federal Home Loan Bank | 3,200 | 2,100
Federal Reserve Bank stock | 5,100 | 5,100
Held to Maturity |  |
Amortized Cost | 625,022 | 660,744
Unrealized Gains | 13 | 8
Unrealized Losses | 33,284 | 48,051
Fair value | 591,751 | 612,701
U.S. Government Treasury [Member] |  |
Available-for-sale |  |
Amortized Cost | 25,947 | 23,977
Unrealized Gains | 1 | 1
Unrealized Losses | 1,269 | 1,928
Allowance for Credit Loss | 0 | 0
Fair Value | 24,679 | 22,050
Held to Maturity |  |
Amortized Cost | 457,681 | 457,374
Unrealized Gains | 0 | 0
Unrealized Losses | 16,492 | 25,641
Fair value | 441,189 | 431,733
U.S. Government Agency [Member] |  |
Available-for-sale |  |
Amortized Cost | 152,983 | 198,888
Unrealized Gains | 104 | 27
Unrealized Losses | 8,053 | 12,863
Allowance for Credit Loss | 0 | 0
Fair Value | 145,034 | 186,052
States and Political Subdivisions [Member] |  |
Available-for-sale |  |
Amortized Cost | 43,951 | 47,197
Unrealized Gains | 1 | 0
Unrealized Losses | 4,861 | 6,855
Allowance for Credit Loss | (8) | (13)
Fair Value | 39,083 | 40,329
Mortgage-Backed Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 73,015 | 80,829
Unrealized Gains | 2 | 2
Unrealized Losses | 9,714 | 11,426
Allowance for Credit Loss | 0 | 0
Fair Value | 63,303 | 69,405
Held to Maturity |  |
Amortized Cost | 167,341 | 203,370
Unrealized Gains | 13 | 8
Unrealized Losses | 16,792 | 22,410
Fair value | 150,562 | 180,968
Corporate Debt Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 63,600 | 97,119
Unrealized Gains | 0 | 19
Unrealized Losses | 6,031 | 8,874
Allowance for Credit Loss | (17) | (28)
Fair Value | 57,552 | 88,236
Other Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 8,251 | 7,222
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Allowance for Credit Loss | 0 | 0
Fair Value | $ 8,251 | $ 7,222

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