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Selected Condensed Quarterly Financial Data (Unaudited) (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
Summary of selected quarterly financial information                      
Interest income                 $ 61,209 $ 51,191 $ 46,030
Interest expense                 10,333 8,192 7,501
Net interest income                 50,876 42,999 38,529
Provision for loan losses                 2,000 2,300 3,200
Noninterest income                 9,337 10,846 8,416
Noninterest expenses                 34,552 31,176 28,209
Income before income tax expense                 23,661 20,369 15,536
Income tax expense                 10,616 7,333 5,369
Net income available to common shareholders                 $ 13,045 $ 13,036 $ 10,167
Earnings per common share                      
Basic                 $ 1.86 $ 2.06 $ 1.64
Diluted                 $ 1.76 $ 1.94 $ 1.55
Weighted average common shares outstanding                      
Basic                 7,005,703 6,318,322 6,204,518
Diluted                 7,393,377 6,720,888 6,560,739
Quarterly Financial Data [Member]                      
Summary of selected quarterly financial information                      
Interest income $ 16,364 $ 15,955 $ 14,931 $ 13,959 $ 13,447 $ 12,912 $ 12,503 $ 12,329      
Interest expense 2,756 2,646 2,579 2,352 2,148 2,032 1,990 2,022      
Net interest income 13,608 13,309 12,352 11,607 11,299 10,880 10,513 10,307      
Provision for loan losses 500 500 500 500 275 825 575 625      
Noninterest income 2,181 2,542 2,563 2,051 2,124 3,017 3,146 2,559      
Noninterest expenses 8,623 8,806 8,763 8,360 8,006 7,800 7,853 7,517      
Income before income tax expense 6,666 6,545 5,652 4,798 5,142 5,272 5,231 4,724      
Income tax expense 4,586 2,295 2,048 1,687 1,851 1,839 1,925 1,718      
Net income available to common shareholders $ 2,080 $ 4,250 $ 3,604 $ 3,111 $ 3,291 $ 3,433 $ 3,306 $ 3,006      
Earnings per common share                      
Basic $ 0.28 $ 0.58 $ 0.52 $ 0.48 $ 0.52 $ 0.54 $ 0.53 $ 0.48      
Diluted $ 0.27 $ 0.55 $ 0.49 $ 0.45 $ 0.49 $ 0.51 $ 0.49 $ 0.45      
Weighted average common shares outstanding                      
Basic 7,304,478 7,281,594 6,986,948 6,437,231 6,375,842 6,322,073 6,301,853 6,272,847      
Diluted 7,696,684 7,668,476 7,366,208 6,829,590 6,775,729 6,740,751 6,702,820 6,634,432