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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2017 3,603,881        
Balance at Dec. 31, 2017 $ 84,859 $ 47,431 $ 1,091 $ (13,518) $ 119,863
Net income 9,006 9,006
Other comprehensive income (loss) (2,593) (2,593)
Dividend reinvestment and purchase plan (in shares) 8,763        
Dividend reinvestment and purchase plan $ 441 441
Cash dividends (2,871) (2,871)
Stock options exercised (in shares) 4,650        
Stock options exercised $ 107 107
Stock-based compensation, net (in shares) 5,560        
Stock-based compensation, net $ 280 280
Change in accounting principle for adoption of ASU 2016-01 141 (141)
Change in accounting principle for adoption of ASU 2018-02 (187) 187
Balance (in shares) at Sep. 30, 2018 3,622,854        
Balance at Sep. 30, 2018 $ 85,687 53,520 (1,456) (13,518) 124,233
Balance (in shares) at Jun. 30, 2018 3,619,843        
Balance at Jun. 30, 2018 $ 85,544 51,121 (431) (13,518) 122,716
Net income 3,304 3,304
Other comprehensive income (loss) (1,025) (1,025)
Dividend reinvestment and purchase plan (in shares) 2,861        
Dividend reinvestment and purchase plan $ 140 140
Cash dividends (905) (905)
Stock options exercised (in shares) 150        
Stock options exercised $ 3 3
Balance (in shares) at Sep. 30, 2018 3,622,854        
Balance at Sep. 30, 2018 $ 85,687 53,520 (1,456) (13,518) $ 124,233
Balance (in shares) at Dec. 31, 2018 3,630,497       3,244,332
Balance at Dec. 31, 2018 $ 85,925 56,037 (154) (13,518) $ 128,290
Net income 9,570 9,570
Other comprehensive income (loss) 2,311 2,311
Dividend reinvestment and purchase plan (in shares) 8,933        
Dividend reinvestment and purchase plan $ 372 372
Treasury shares acquired (2,229) (2,229)
Cash dividends (2,721) (2,721)
Stock options exercised (in shares) 200        
Stock options exercised $ 4 4
Stock-based compensation, net (in shares) 7,516        
Stock-based compensation, net $ 316 $ 316
Balance (in shares) at Sep. 30, 2019 3,647,146       3,211,565
Balance at Sep. 30, 2019 $ 86,617 62,886 2,157 (15,747) $ 135,913
Balance (in shares) at Jun. 30, 2019 3,646,497        
Balance at Jun. 30, 2019 $ 86,590 60,517 1,377 (14,224) 134,260
Net income 3,269 3,269
Other comprehensive income (loss) 780 780
Dividend reinvestment and purchase plan (in shares) 649        
Dividend reinvestment and purchase plan $ 27 27
Treasury shares acquired (1,523) (1,523)
Cash dividends (900) $ (900)
Balance (in shares) at Sep. 30, 2019 3,647,146       3,211,565
Balance at Sep. 30, 2019 $ 86,617 $ 62,886 $ 2,157 $ (15,747) $ 135,913