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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 10,177 10,177
Cash dividends declared 0 (5,795) (5,795)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 820 0 820
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 19,462    
Stock-based compensation $ 159 0 159
Stock-based compensation (in shares) 4,114    
Balance at Jun. 30, 2023 $ 135,199 77,345 212,544
Balance (in shares) at Jun. 30, 2023 14,309,160    
Balance at Mar. 31, 2023 $ 134,679 73,719 208,398
Balance (in shares) at Mar. 31, 2023 14,294,898    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 6,524 6,524
Cash dividends declared 0 (2,898) (2,898)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 415 0 415
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 10,148    
Stock-based compensation $ 105 0 105
Stock-based compensation (in shares) 4,114    
Balance at Jun. 30, 2023 $ 135,199 77,345 212,544
Balance (in shares) at Jun. 30, 2023 14,309,160    
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 9,320 $ 9,320
Cash dividends declared 0 (6,047) (6,047)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 824 0 824
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 23,623    
Stock-based compensation $ 140 0 140
Stock-based compensation (in shares) 5,357    
Balance at Jun. 30, 2024 $ 137,138 88,277 $ 225,415
Balance (in shares) at Jun. 30, 2024 14,361,225   14,361,225
Balance at Mar. 31, 2024 $ 136,622 86,309 $ 222,931
Balance (in shares) at Mar. 31, 2024 14,343,500    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 4,993 4,993
Cash dividends declared 0 (3,025) (3,025)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 419 0 419
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 11,855    
Stock-based compensation $ 97 0 97
Stock-based compensation (in shares) 5,870    
Balance at Jun. 30, 2024 $ 137,138 $ 88,277 $ 225,415
Balance (in shares) at Jun. 30, 2024 14,361,225   14,361,225