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Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance Sheets                        
Cash and cash equivalents $ 19,207 $ 22,375 $ 23,718 $ 17,600 $ 17,366 $ 23,456 $ 20,838 $ 14,533 $ 19,207 $ 17,366    
Interest-bearing deposits in other banks 860 584 291 3,272 293 15,098 7,568 6,372 860 293    
Investments 556,739 541,678 552,269 553,453 527,244 471,063 457,599 453,336 556,739 527,244    
Restricted equity securities 10,358 10,798 12,311 13,363 11,930 14,048 14,441 13,875 10,358 11,930    
Net loans and loans held for sale 1,153,796 1,110,508 1,110,919 1,080,347 1,062,170 1,019,922 1,029,568 994,947 1,153,796 1,062,170    
Other assets 101,970 95,758 96,143 95,793 93,872 91,501 91,440 91,618 101,970 93,872    
Total assets 1,842,930 1,781,701 1,795,651 1,763,828 1,712,875 1,635,088 1,621,454 1,574,681 1,842,930 1,712,875    
Deposits 1,418,879 1,350,049 1,319,259 1,346,483 1,242,957 1,173,749 1,145,709 1,109,441 1,418,879 1,242,957    
Borrowed funds 228,758 234,328 282,277 226,467 278,901 268,098 283,095 276,531 228,758 278,901    
Other liabilities 13,972 17,442 16,578 15,968 18,496 17,247 17,862 17,165 13,972 18,496    
Shareholders' equity 181,321 179,882 177,537 174,910 172,521 175,994 174,788 171,544 181,321 172,521 $ 167,498 $ 161,554
Total liabilities and shareholders' equity 1,842,930 1,781,701 1,795,651 1,763,828 1,712,875 1,635,088 1,621,454 1,574,681 1,842,930 1,712,875    
Statements of Income                        
Interest income 15,822 15,517 15,002 14,491 13,600 13,283 13,600 13,276 60,832 53,759 50,810  
Interest expense 3,614 3,563 3,337 3,015 2,862 2,754 2,649 2,547 13,529 10,812 9,874  
Net interest income 12,208 11,954 11,665 11,476 10,738 10,529 10,951 10,729 47,303 42,947 40,936  
Provision for loan losses 250 750 500 500 475 375 375 375 2,000 1,600 1,550  
Net interest income after provision for loan losses 11,958 11,204 11,165 10,976 10,263 10,154 10,576 10,354 45,303 41,347 39,386  
Non-interest income 3,210 3,493 3,002 2,843 3,060 3,469 3,006 2,964 12,548 12,499 12,230  
Non-interest expense 8,300 8,013 7,640 7,698 7,533 7,405 7,245 7,200 31,651 29,383 29,896  
Income before income taxes 6,868 6,684 6,527 6,121 5,790 6,218 6,337 6,118 26,200 24,463 21,720  
Applicable tax expense 1,782 1,702 1,644 1,484 1,470 1,656 1,713 1,615 6,612 6,454 5,514  
Net income $ 5,086 $ 4,982 $ 4,883 $ 4,637 $ 4,320 $ 4,562 $ 4,624 $ 4,503 $ 19,588 $ 18,009 $ 16,206  
Basic earnings per common share (in usd per share) $ 0.48 $ 0.46 $ 0.45 $ 0.43 $ 0.40 $ 0.43 $ 0.43 $ 0.42 $ 1.82 $ 1.68 $ 1.52  
Diluted earnings per common share (in usd per share) $ 0.47 $ 0.46 $ 0.45 $ 0.43 $ 0.39 $ 0.42 $ 0.43 $ 0.42 $ 1.81 $ 1.66 $ 1.51  
Other comprehensive income (loss), net of tax                        
Net unrealized gain (loss) on securities available for sale $ (1,562) $ (240) $ 349 $ 1 $ (3,643) $ (1,292) $ 1,025 $ 1,852 $ (1,452) $ (2,058) $ (1,399)  
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (3) (3) (4) (4) (5) 9 (10) (11) (14) (17) (64)  
Net unrealized gain on cash flow hedging derivative instruments 235 (20) (171) 63 1,105 193 (135) 0 107 1,163 0  
Unrecognized gain (loss) on postretirement benefit costs (19) 0 0 0 54 0 0 0 (19) 54 (31)  
Other comprehensive loss (1,349) (263) 174 60 (2,489) (1,090) 880 1,841 (1,378) (858) (1,494)  
Comprehensive income $ 3,737 $ 4,719 $ 5,057 $ 4,697 $ 1,831 $ 3,472 $ 5,504 $ 6,344 $ 18,210 $ 17,151 $ 14,712