Condensed Financial Information (Parent Company Only) - Schedule of Condensed Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Other assets	$ 75,153	$ 63,343
Total assets	1,528,358	1,468,879
LIABILITIES
Subordinated notes	16,273	16,239
Total liabilities	$ 1,461,878	$ 1,403,072
STOCKHOLDERS' EQUITY
Common stock, par value (in usd per share)	$ 2.00	$ 2.00
Common stock, shares authorized (in shares)	7,500,000	7,500,000
Common stock, shares issued (in shares)	5,012,084	4,995,348
Common stock, $2.00 par value; 7,500,000 shares authorized; 5,012,084 shares issued at December 31, 2024 and 4,995,348 shares issued at December 31, 2023	$ 10,024	$ 9,991
Additional paid-in capital	3,031	2,621
Retained earnings	$ 91,722	$ 89,472
Treasury stock, shares (in shares)	474,075	476,500
Treasury stock at cost; 474,075 shares at December 31, 2024 and 476,500 shares at December 31, 2023	$ (4,300)	$ (4,322)
Accumulated other comprehensive loss	(33,997)	(31,955)
Total stockholders' equity	66,480	65,807	$ 55,220
Total liabilities and stockholders' equity	1,528,358	1,468,879
Parent Company
ASSETS
Cash	44	4
Other investments	120	98
Investment in subsidiary - Union	82,437	82,122
Other assets	660	519
Total assets	83,261	82,743
LIABILITIES
Subordinated notes	16,273	16,239
Accrued interest and other liabilities	508	697
Total liabilities	$ 16,781	$ 16,936
STOCKHOLDERS' EQUITY
Common stock, par value (in usd per share)	$ 2.00	$ 2.00
Common stock, shares authorized (in shares)	7,500,000	7,500,000
Common stock, shares issued (in shares)	5,012,084	4,995,348
Common stock, $2.00 par value; 7,500,000 shares authorized; 5,012,084 shares issued at December 31, 2024 and 4,995,348 shares issued at December 31, 2023	$ 10,024	$ 9,991
Additional paid-in capital	3,031	2,621
Retained earnings	$ 91,722	$ 89,472
Treasury stock, shares (in shares)	474,075	476,500
Treasury stock at cost; 474,075 shares at December 31, 2024 and 476,500 shares at December 31, 2023	$ (4,300)	$ (4,322)
Accumulated other comprehensive loss	(33,997)	(31,955)
Total stockholders' equity	66,480	65,807
Total liabilities and stockholders' equity	$ 83,261	$ 82,743