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Statements of Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2021 $ 88,230 $ 64,392 $ 152,622
Balance (in shares) at Dec. 31, 2021 13,112,948    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 14,569 14,569
Cash dividends declared 0 (8,115) (8,115)
Issuance of common stock $ 43,970 0 43,970
Issuance of common stock (in shares) 1,121,940    
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,322 0 1,322
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 33,016    
Stock-based compensation $ 208 0 208
Stock-based compensation (in shares) 7,552    
Balance at Sep. 30, 2022 $ 133,730 70,846 204,576
Balance (in shares) at Sep. 30, 2022 14,275,456    
Balance at Jun. 30, 2022 $ 133,239 67,945 201,184
Balance (in shares) at Jun. 30, 2022 14,264,763    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 5,681 5,681
Cash dividends declared 0 (2,780) (2,780)
Issuance of common stock $ 0 0 0
Issuance of common stock (in shares) 0    
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 441 0 441
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 11,160    
Stock-based compensation $ 50 0 50
Stock-based compensation (in shares) (467)    
Balance at Sep. 30, 2022 $ 133,730 70,846 204,576
Balance (in shares) at Sep. 30, 2022 14,275,456    
Balance at Dec. 31, 2022 $ 134,220 72,963 $ 207,183
Balance (in shares) at Dec. 31, 2022 14,285,584   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   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   14,320,737