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Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effect of Fourth Quarter Events [Line Items]                      
Interest income                 $ 39,479 $ 32,480  
Interest expense                 6,212 4,094  
Net interest income                 33,267 28,386  
Provision for loan losses                 600 400  
Noninterest income                 16,624 17,217  
Noninterest expense                 34,847 31,578  
Income tax expense                 2,806 2,560  
Net income                 11,638 11,065 $ 8,784
Preferred share dividend                 975 975  
Net income available to common                 $ 10,663 $ 10,090  
Basic earnings per common share                 $ 1.72 $ 2.1  
Diluted earnings per common share                 1.51 1.74  
Quarterly Financial Information [Member]                      
Effect of Fourth Quarter Events [Line Items]                      
Interest income $ 10,638 $ 10,258 $ 9,732 $ 8,851 $ 8,762 $ 8,338 $ 7,966 $ 7,414      
Interest expense 2,024 1,729 1,308 1,151 1,108 1,075 1,003 908      
Net interest income 8,614 8,529 8,424 7,700 7,654 7,263 6,963 6,506      
Provision for loan losses 300 300 200 200      
Noninterest income 3,930 4,202 4,249 4,243 4,092 4,861 4,462 3,802      
Noninterest expense 8,852 8,789 8,579 8,627 8,106 8,284 7,806 7,382      
Income tax expense 732 824 687 563 (592) 1,117 1,102 933      
Net income 2,960 3,118 3,107 2,453 4,032 2,723 2,317 1,993      
Preferred share dividend 243 244 244 244 243 244 244 244      
Net income available to common $ 2,717 $ 2,874 $ 2,863 $ 2,209 $ 3,789 $ 2,479 $ 2,073 $ 1,749      
Basic earnings per common share $ 0.42 $ 0.45 $ 0.45 $ 0.40 $ 0.79 $ 0.52 $ 0.43 $ 0.36      
Diluted earnings per common share 0.37 0.39 0.40 0.35 0.64 0.43 0.37 0.31      
Dividends per share $ 0.085 $ 0.080 $ 0.080 $ 0.075 $ 0.075 $ 0.07 $ 0.07 $ 0.065 $ 0.085 $ 0.075