INVESTMENT SECURITIES (Investment Portfolio Composition) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale
Amortized cost	$ 461,646	$ 660,732
Unrealized Gains	115	1,375
Unrealized Losses	44,975	7,460
Allowance for Credit Losses	(41)	(36)
Fair Value	416,745	654,611
Federal Home Loan Bank	2,300	2,000
Federal Reserve Bank stock	5,000	5,100
Held to Maturity
Amortized Cost	676,178	339,601
Unrealized Gains	10	2,819
Unrealized Losses	52,560	2,721
Fair Value	623,628	339,699
U.S. Government Treasury [Member]
Available-for-sale
Amortized cost	21,140	190,409
Unrealized Gains	0	65
Unrealized Losses	2,082	2,606
Allowance for Credit Losses	0	0
Fair Value	19,058	187,868
Held to Maturity
Amortized Cost	462,302	115,499
Unrealized Gains	0	0
Unrealized Losses	27,585	1,622
Fair Value	434,717	113,877
U.S. Government Agency [Member]
Available-for-sale
Amortized cost	206,631	238,490
Unrealized Gains	85	1,229
Unrealized Losses	13,572	2,141
Allowance for Credit Losses	0	0
Fair Value	193,144	237,578
States and Political Subdivisions [Member]
Available-for-sale
Amortized cost	47,249	47,762
Unrealized Gains	0	44
Unrealized Losses	7,008	811
Allowance for Credit Losses	(13)	(15)
Fair Value	40,228	46,980
Mortgage-Backed Securities [Member]
Available-for-sale
Amortized cost	82,879	89,440
Unrealized Gains	2	27
Unrealized Losses	12,583	598
Allowance for Credit Losses	0	0
Fair Value	70,298	88,869
Held to Maturity
Amortized Cost	213,876	224,102
Unrealized Gains	10	2,819
Unrealized Losses	24,975	1,099
Fair Value	188,911	225,822
Corporate Debt Securities [Member]
Available-for-sale
Amortized cost	96,421	87,537
Unrealized Gains	28	10
Unrealized Losses	9,730	1,304
Allowance for Credit Losses	(28)	(21)
Fair Value	86,691	86,222
Other Securities [Member]
Available-for-sale
Amortized cost	7,326	7,094
Unrealized Gains	0	0
Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	$ 7,326	$ 7,094

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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