CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative effect of adoption of ASU 2016-13	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	RETAINED EARNINGS Cumulative effect of adoption of ASU 2016-13	ACCUMULATED OTHER COMPREHENSIVE LOSS	TREASURY STOCK
Beginning balance (in shares) at Dec. 31, 2021			7,550,272
Beginning balance at Dec. 31, 2021	$ 172,274		$ 41,945	$ 53,795	$ 89,761		$ (1,112)	$ (12,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,913				12,913
Other comprehensive loss	(13,457)						(13,457)
Stock-based compensation	1,004			1,004
Cash settlement of options	(1,074)			(1,074)
Dividends declared	(6,778)				(6,778)
Common shares issued for employee stock purchase plan (in shares)			2,960
Common shares issued for employee stock purchase plan	67		$ 17	50
Director compensation plan (in shares)			9,968
Director Compensation Plan	240		$ 57	183
Purchase of treasury stock	(700)							(700)
Ending balance (in shares) at Sep. 30, 2022			7,563,200
Ending balance at Sep. 30, 2022	164,489		$ 42,019	53,958	95,896		(14,569)	(12,815)
Beginning balance (in shares) at Dec. 31, 2021			7,550,272
Beginning balance at Dec. 31, 2021	$ 172,274		$ 41,945	53,795	89,761		(1,112)	(12,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Ending balance (in shares) at Dec. 31, 2022			7,566,810
Ending balance at Dec. 31, 2022	$ 167,665	$ 1,647	$ 42,039	54,252	98,147	$ 1,647	(13,958)	(12,815)
Beginning balance (in shares) at Jun. 30, 2022			7,559,165
Beginning balance at Jun. 30, 2022	166,054		$ 41,995	53,651	92,903		(9,680)	(12,815)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,250				5,250
Other comprehensive loss	(4,889)						(4,889)
Stock-based compensation	236			236
Dividends declared	(2,257)				(2,257)
Common shares issued for employee stock purchase plan (in shares)			1,057
Common shares issued for employee stock purchase plan	23		$ 6	17
Director compensation plan (in shares)			2,978
Director Compensation Plan	72		$ 18	54
Ending balance (in shares) at Sep. 30, 2022			7,563,200
Ending balance at Sep. 30, 2022	164,489		$ 42,019	53,958	95,896		(14,569)	(12,815)
Beginning balance (in shares) at Dec. 31, 2022			7,566,810
Beginning balance at Dec. 31, 2022	167,665	$ 1,647	$ 42,039	54,252	98,147	$ 1,647	(13,958)	(12,815)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,053				11,053
Other comprehensive loss	(979)						(979)
Stock-based compensation	715			715
Dividends declared	(6,780)				(6,780)
Common shares issued for employee stock purchase plan (in shares)			3,120
Common shares issued for employee stock purchase plan	73		$ 17	56
Director compensation plan (in shares)			7,560
Director Compensation Plan	193		$ 42	151
Registered at-the-market shares issuance, net proceeds (in shares)			34,411
Registered at-the-market shares issuance, net proceeds	753		$ 191	562
Dividend reinvestment plan (in shares)			8,349
Dividend reinvestment plan	200		$ 46	154
Ending balance (in shares) at Sep. 30, 2023			7,620,250
Ending balance at Sep. 30, 2023	174,540		$ 42,335	55,890	104,067		(14,937)	(12,815)
Beginning balance (in shares) at Jun. 30, 2023			7,573,713
Beginning balance at Jun. 30, 2023	174,402		$ 42,077	54,869	104,104		(13,833)	(12,815)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,224				2,224
Other comprehensive loss	(1,104)						(1,104)
Stock-based compensation	229			229
Dividends declared	(2,261)				(2,261)
Common shares issued for employee stock purchase plan (in shares)			1,436
Common shares issued for employee stock purchase plan	34		$ 8	26
Director compensation plan (in shares)			2,341
Director Compensation Plan	63		$ 13	50
Registered at-the-market shares issuance, net proceeds (in shares)			34,411
Registered at-the-market shares issuance, net proceeds	753		$ 191	562
Dividend reinvestment plan (in shares)			8,349
Dividend reinvestment plan	200		$ 46	154
Ending balance (in shares) at Sep. 30, 2023			7,620,250
Ending balance at Sep. 30, 2023	$ 174,540		$ 42,335	$ 55,890	$ 104,067		$ (14,937)	$ (12,815)