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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic earnings per share                      
Net income $ 5,603 $ 6,602 $ 6,326 $ 5,381 $ 6,175 $ 4,288 $ 4,728 $ 5,358 $ 23,912 $ 20,549 $ 18,101
Less: Preferred stock dividends                 42 125 133
Net Income Available to Common Shareholders $ 5,603 $ 6,602 $ 6,326 $ 5,339 $ 6,144 $ 4,257 $ 4,697 $ 5,327 $ 23,870 $ 20,424 $ 17,968
Weighted average common shares outstanding 22,155,549 21,538,752 18,268,880 17,924,124 17,905,871 17,408,964 13,860,008 13,824,017 19,987,728 15,765,444 13,591,053
Basic Earnings Per Share $ 0.25 $ 0.31 $ 0.35 $ 0.30 $ 0.34 $ 0.25 $ 0.34 $ 0.39 $ 1.19 [1] $ 1.30 [1] $ 1.32 [1]
Diluted earnings per share                      
Net income available to common shareholders                 $ 23,870 $ 20,424 $ 17,968
Effect of dilutive securities:                      
Warrants                   330,474 473,519
Weighted average shares outstanding 22,283,722 21,651,953 18,364,167 18,012,726 18,020,615 17,839,881 14,456,379 14,414,259 20,082,410 16,197,312 14,181,188
Diluted Earnings Per Share $ 0.25 $ 0.30 $ 0.34 $ 0.30 $ 0.34 $ 0.24 $ 0.33 $ 0.37 $ 1.19 [1] $ 1.26 [1] $ 1.27 [1]
Restricted Stock [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities                 26,553 48,015 59,214
Stock Options [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities                 68,129 53,379 57,402
[1] Adjusted for 3:2 stock split on November 14, 2016.