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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
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