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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2022 $ 134,220 $ 72,963 $ 207,183
Balance (in shares) at Dec. 31, 2022 14,285,584    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 17,745 17,745
Cash dividends declared 0 (8,696) (8,696)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,258 0 1,258
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 31,039    
Stock-based compensation $ 217 0 217
Stock-based compensation (in shares) 4,114    
Balance at Sep. 30, 2023 $ 135,695 82,012 217,707
Balance (in shares) at Sep. 30, 2023 14,320,737    
Balance at Jun. 30, 2023 $ 135,199 77,345 212,544
Balance (in shares) at Jun. 30, 2023 14,309,160    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 7,568 7,568
Cash dividends declared 0 (2,901) (2,901)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 438 0 438
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 11,577    
Stock-based compensation $ 58 0 58
Stock-based compensation (in shares) 0    
Balance at Sep. 30, 2023 $ 135,695 82,012 217,707
Balance (in shares) at Sep. 30, 2023 14,320,737    
Balance at Dec. 31, 2023 $ 136,174 85,004 $ 221,178
Balance (in shares) at Dec. 31, 2023 14,332,245   14,332,245
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 15,183 $ 15,183
Cash dividends declared 0 (9,075) (9,075)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,214 0 1,214
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 34,327    
Stock-based compensation $ 188 0 188
Stock-based compensation (in shares) 5,357    
Balance at Sep. 30, 2024 $ 137,576 91,112 $ 228,688
Balance (in shares) at Sep. 30, 2024 14,371,929   14,371,929
Balance at Jun. 30, 2024 $ 137,138 88,277 $ 225,415
Balance (in shares) at Jun. 30, 2024 14,361,225    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 5,863 5,863
Cash dividends declared 0 (3,028) (3,028)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 390 0 390
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 10,704    
Stock-based compensation $ 48 0 48
Stock-based compensation (in shares) 0    
Balance at Sep. 30, 2024 $ 137,576 $ 91,112 $ 228,688
Balance (in shares) at Sep. 30, 2024 14,371,929   14,371,929