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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 |  |  |

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