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Quarterly Results of Operations (Unaudited) - Summary of Quarterly Consolidated Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 36,774 | $ 32,070 | $ 30,805 | $ 28,834 | $ 29,390 | $ 28,962 | $ 24,650 | $ 23,528 | $ 128,483 |  | $ 106,529 |  | $ 88,588 |
Interest expense | 5,319 | 4,191 | 3,607 | 3,266 | 8,450 | 4,552 | 3,781 | 3,754 | 16,383 |  | 20,537 |  | 13,854 |
Net interest income | 31,455 | 27,879 | 27,198 | 25,568 | 20,940 | 24,410 | 20,869 | 19,774 | 112,100 |  | 85,992 |  | 74,734 |
Provision for loan losses | 1,100 | 710 | 330 | 330 | 623 | 455 | 232 | 532 | 2,470 |  | 1,842 |  | 3,162 |
Gain on sale of securities |  | 6 | (3) | 35 | 961 |  | 767 | 108 | 38 |  | 1,836 |  | 189 |
Net income | 7,650 | 8,171 | 9,072 | 8,224 | 5,603 | 6,602 | 6,326 | 5,381 | 33,117 |  | 23,912 |  | 20,549 |
Net Income Available to Common Shareholders | $ 7,650 | $ 8,171 | $ 9,072 | $ 8,224 | $ 5,603 | $ 6,602 | $ 6,326 | $ 5,339 | $ 33,117 |  | $ 23,870 |  | $ 20,424 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.30 | $ 0.36 | $ 0.41 | $ 0.37 | $ 0.25 | $ 0.31 | $ 0.35 | $ 0.30 | $ 1.44 | [1] | $ 1.19 | [1] | $ 1.30 | [1]
Diluted | $ 0.30 | $ 0.36 | $ 0.41 | $ 0.37 | $ 0.25 | $ 0.30 | $ 0.34 | $ 0.30 | $ 1.43 | [1] | $ 1.19 | [1] | $ 1.26 | [1]
Average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 25,140,800 | 22,580,160 | 22,176,465 | 22,175,526 | 22,155,549 | 21,538,752 | 18,268,880 | 17,924,124 | 23,035,824 |  | 19,987,728 |  | 15,765,444 |
Diluted | 25,262,010 | 22,715,273 | 22,322,390 | 22,326,071 | 22,283,722 | 21,651,953 | 18,364,167 | 18,012,726 | 23,173,626 |  | 20,082,410 |  | 16,197,312 |
[1] | Adjusted for 3:2 stock split on November 14, 2016

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