INVESTMENT SECURITIES (Investment Portfolio Composition) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 323,821	$ 402,358
Unrealized Gains	4,535	1,635
Unrealized Losses	103	392
Market Value	328,253	403,601
Federal Home Loan Bank	3,000	2,900
Federal Reserve Bank stock	4,800	4,800
Held to Maturity
Amortized Cost	202,593	239,539
Unrealized Gains	5,673	2,079
Unrealized Losses	0	189
Market Value	208,266	241,429
Total
Amortized Cost	526,414	641,897
Unrealized Gain	10,208	3,714
Unrealized Loss	103	581
Fair Value	536,519	645,030
U.S. Government Treasury [Member]
Available-for-sale
Amortized Cost	118,566	231,996
Unrealized Gains	1,550	849
Unrealized Losses	0	67
Market Value	120,116	232,778
Held to Maturity
Amortized Cost	15,007	20,036
Unrealized Gains	51	15
Unrealized Losses	0	9
Market Value	15,058	20,042
U.S. Government Agency [Member]
Available-for-sale
Amortized Cost	192,283	155,706
Unrealized Gains	2,814	697
Unrealized Losses	103	325
Market Value	194,994	156,078
States and Political Subdivisions [Member]
Available-for-sale
Amortized Cost	4,722	6,310
Unrealized Gains	108	9
Unrealized Losses	0	0
Market Value	4,830	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	472	693
Unrealized Gains	63	80
Unrealized Losses	0	0
Market Value	535	773
Held to Maturity
Amortized Cost	187,586	218,127
Unrealized Gains	5,622	2,064
Unrealized Losses	0	180
Market Value	193,208	220,011
Equity Securities [Member]
Available-for-sale
Amortized Cost	7,778	7,653
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	$ 7,778	$ 7,653

Available for Sale and Held-to-maturity Securities, Accumulated Unrecognized Holding Gain before tax

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Available for Sale and Held-to-maturity Securities, Accumulated Unrecognized Holding Loss before tax

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This item represents the cost of debt and equity securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of debt and equity financial instruments classified as either held-to-maturity or available-for-sale.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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