Condensed Financial Information (Parent Company Only) - Schedule of Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 3,001	$ 1,324	$ 2,019	$ 2,417	$ 3,049	$ 2,532	$ 2,699	$ 2,977	$ 8,761	$ 11,257
Adjustments to reconcile net income to net cash provided by operating activities:
Net gains on other investments									(216)	(189)
Amortization of debt issuance costs									34	34
(Increase) decrease in other assets									(131)	(3,079)
Net cash provided by operating activities									12,151	9,191
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used in investing activities									(124,826)	(82,252)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid									(6,444)	(6,415)
Purchase of treasury stock									0	(130)
Net cash provided by financing activities									50,847	112,842
Beginning of year				77,666				37,885	77,666	37,885
End of year	15,838				77,666				15,838	77,666
Dividends paid on Common Stock:
Dividends declared									6,511	6,491
Dividends reinvested									(67)	(76)
Dividends paid									6,444	6,415
Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES
Net income									8,761	11,257
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of Union									(1,766)	(5,034)
Net gains on other investments									(10)	(11)
Amortization of debt issuance costs									34	34
(Increase) decrease in other assets									(141)	125
(Decrease) increase in other liabilities									(382)	34
Net cash provided by operating activities									6,496	6,405
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of other investments									(12)	(12)
Net cash used in investing activities									(12)	(12)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid									(6,444)	(6,415)
Purchase of treasury stock									0	(130)
Net cash provided by financing activities									(6,444)	(6,545)
Net increase (decrease) in cash									40	(152)
Beginning of year				$ 4				$ 156	4	156
End of year	$ 44				$ 4				44	4
Supplemental Disclosures of Cash Flow Information
Interest paid									571	569
Dividends paid on Common Stock:
Dividends declared									6,511	6,491
Dividends reinvested									(67)	(76)
Dividends paid									$ 6,444	$ 6,415