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Nature of Operations and Summary of Significant Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (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
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 7,650 | $ 8,171 | $ 9,072 | $ 8,224 | $ 5,603 | $ 6,602 | $ 6,326 | $ 5,381 | $ 33,117 |  | $ 23,912 |  | $ 20,549 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  |  |  | 42 |  | 125 |
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 |
Weighted average common shares outstanding | 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 |
Basic Earnings Per Share | $ 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 earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ 33,117 |  | $ 23,870 |  | $ 20,424 |
Weighted average common shares outstanding | 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 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |  |  |  | 330,474 |
Weighted average shares outstanding | 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 |
Diluted Earnings Per Share | $ 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]
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  | 31,321 |  | 26,553 |  | 48,015 |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  | 106,481 |  | 68,129 |  | 53,379 |
[1] | Adjusted for 3:2 stock split on November 14, 2016

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