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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2023 $ 136,174 $ 85,004 $ 221,178
Balance (in shares) at Dec. 31, 2023 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    
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    
Balance at Dec. 31, 2024 $ 138,089 93,103 $ 231,192
Balance (in shares) at Dec. 31, 2024 14,386,282   14,386,282
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 14,891 $ 14,891
Cash dividends declared 0 (9,475) (9,475)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,202 0 1,202
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 38,965    
Stock-based compensation $ 211 0 211
Stock-based compensation (in shares) 8,228    
Balance at Sep. 30, 2025 $ 139,502 98,519 $ 238,021
Balance (in shares) at Sep. 30, 2025 14,433,475   14,433,475
Balance at Jun. 30, 2025 $ 139,071 95,480 $ 234,551
Balance (in shares) at Jun. 30, 2025 14,420,319    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 6,201 6,201
Cash dividends declared 0 (3,162) (3,162)
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) 13,168    
Stock-based compensation $ 41 0 41
Stock-based compensation (in shares) (12)    
Balance at Sep. 30, 2025 $ 139,502 $ 98,519 $ 238,021
Balance (in shares) at Sep. 30, 2025 14,433,475   14,433,475