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SECURITIES - Fair value and gross unrealized losses of securities with unrealized losses (Details) $ in Thousands	Sep. 30, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Available for Sale
Less Than 12 Months, Fair Value	$ 36,980	$ 203,413
Less Than 12 Months, Unrealized Losses	(1,701)	(6,804)
Greater Than 12 Months, Fair Value	140,446	77,570
Greater Than 12 Months, Unrealized Losses	(24,855)	(14,988)
Total, Fair Value	177,426	280,983
Total, Unrealized Losses	$ (26,556)	$ (21,792)
Number of Securities | item	245	250
Held to Maturity
Less Than 12 Months, Fair Value	$ 36,117	$ 29,881
Less Than 12 Months, Unrealized Losses	(694)	(1,308)
Greater Than 12 Months, Fair Value	34,839	4,868
Greater Than 12 Months, Unrealized Losses	(1,572)	(134)
Total, Fair Value	70,956	34,749
Total, Unrealized Losses	$ (2,266)	$ (1,442)
Number of Securities | item	52	17
Debt Securities, Available for Sale, Allowance for credit losses	$ 0
Debt Securities, Held to maturity, Allowance for credit losses	0
U.S. Treasury securities
Available for Sale
Less Than 12 Months, Fair Value		$ 99,433
Less Than 12 Months, Unrealized Losses		(559)
Greater Than 12 Months, Fair Value	41,835	42,664
Greater Than 12 Months, Unrealized Losses	(7,824)	(6,958)
Total, Fair Value	41,835	142,097
Total, Unrealized Losses	$ (7,824)	$ (7,517)
Number of Securities | item	9	12
Held to Maturity
Less Than 12 Months, Fair Value	$ 36,117	$ 29,464
Less Than 12 Months, Unrealized Losses	(694)	(1,306)
Greater Than 12 Months, Fair Value	34,621	4,868
Greater Than 12 Months, Unrealized Losses	(1,570)	(134)
Total, Fair Value	70,738	34,332
Total, Unrealized Losses	$ (2,264)	$ (1,440)
Number of Securities | item	51	15
Obligations of U.S. Government sponsored agencies
Available for Sale
Less Than 12 Months, Fair Value	$ 8,622	$ 6,735
Less Than 12 Months, Unrealized Losses	(355)	(652)
Greater Than 12 Months, Fair Value	19,158	15,014
Greater Than 12 Months, Unrealized Losses	(3,753)	(2,534)
Total, Fair Value	27,780	21,749
Total, Unrealized Losses	$ (4,108)	$ (3,186)
Number of Securities | item	27	16
Obligations of states and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	$ 16,359	$ 50,839
Less Than 12 Months, Unrealized Losses	(894)	(2,650)
Greater Than 12 Months, Fair Value	37,762	15,933
Greater Than 12 Months, Unrealized Losses	(8,926)	(4,953)
Total, Fair Value	54,121	66,772
Total, Unrealized Losses	$ (9,820)	$ (7,603)
Number of Securities | item	83	103
Held to Maturity
Less Than 12 Months, Fair Value		$ 417
Less Than 12 Months, Unrealized Losses		(2)
Greater Than 12 Months, Fair Value	$ 218
Greater Than 12 Months, Unrealized Losses	(2)
Total, Fair Value	218	417
Total, Unrealized Losses	$ (2)	$ (2)
Number of Securities | item	1	2
Mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	$ 7,149	$ 35,731
Less Than 12 Months, Unrealized Losses	(310)	(1,993)
Greater Than 12 Months, Fair Value	28,691	879
Greater Than 12 Months, Unrealized Losses	(2,542)	(71)
Total, Fair Value	35,840	36,610
Total, Unrealized Losses	$ (2,852)	$ (2,064)
Number of Securities | item	114	107
Corporate notes
Available for Sale
Less Than 12 Months, Fair Value	$ 4,850	$ 9,701
Less Than 12 Months, Unrealized Losses	(142)	(920)
Greater Than 12 Months, Fair Value	12,268	3,080
Greater Than 12 Months, Unrealized Losses	(1,802)	(472)
Total, Fair Value	17,118	12,781
Total, Unrealized Losses	$ (1,944)	$ (1,392)
Number of Securities | item	9	8
Certificates of Deposits
Available for Sale
Less Than 12 Months, Fair Value		$ 974
Less Than 12 Months, Unrealized Losses		(30)
Greater Than 12 Months, Fair Value	$ 732
Greater Than 12 Months, Unrealized Losses	(8)
Total, Fair Value	732	974
Total, Unrealized Losses	$ (8)	$ (30)
Number of Securities | item	3	4

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