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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, 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
Summary of selected quarterly financial information                      
Interest income                 $ 76,657 $ 61,209 $ 51,191
Interest expense                 16,505 10,333 8,192
Net interest income                 60,152 50,876 42,999
Provision for loan losses                 1,900 2,000 2,300
Noninterest income                 10,201 9,337 10,846
Noninterest expenses                 39,763 34,552 31,176
Income before income tax expense                 28,690 23,661 20,369
Income tax benefit                 6,401 10,616 7,333
Net income available to common shareholders                 $ 22,289 $ 13,045 $ 13,036
Earnings per common share                      
Basic                 $ 3.02 $ 1.86 $ 2.06
Diluted                 $ 2.88 $ 1.76 $ 1.94
Weighted average common shares outstanding                      
Basic                 7,384,200 7,005,703 6,318,322
Diluted                 7,737,495 7,393,377 6,720,888
Quarterly Financial Data [Member]                      
Summary of selected quarterly financial information                      
Interest income $ 21,079 $ 19,865 $ 18,535 $ 17,178 $ 16,364 $ 15,955 $ 14,931 $ 13,959      
Interest expense 5,082 4,364 3,923 3,136 2,756 2,646 2,579 2,352      
Net interest income 15,997 15,501 14,612 14,042 13,608 13,309 12,352 11,607      
Provision for loan losses 600 400 400 500 500 500 500 500      
Noninterest income 2,477 2,533 2,771 2,420 2,181 2,542 2,563 2,051      
Noninterest expenses 10,391 10,188 9,979 9,205 8,623 8,806 8,763 8,360      
Income before income tax expense 7,483 7,446 7,004 6,757 6,666 6,545 5,652 4,798      
Income tax benefit 1,700 1,664 1,494 1,543 4,586 2,295 2,048 1,687      
Net income available to common shareholders $ 5,783 $ 5,782 $ 5,510 $ 5,214 $ 2,080 $ 4,250 $ 3,604 $ 3,111      
Earnings per common share                      
Basic $ 0.78 $ 0.78 $ 0.75 $ 0.71 $ 0.28 $ 0.58 $ 0.52 $ 0.48      
Diluted $ 0.75 $ 0.75 $ 0.71 $ 0.67 $ 0.27 $ 0.55 $ 0.49 $ 0.45      
Weighted average common shares outstanding                      
Basic 7,427,902 7,400,174 7,370,709 7,336,839 7,304,478 7,281,594 6,986,948 6,437,231      
Diluted 7,725,661 7,746,205 7,751,146 7,726,885 7,696,684 7,668,476 7,366,208 6,829,590