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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic earnings per share                      
Net income $ 18,543 $ 20,537 $ 16,642 $ 10,816 $ 13,133 $ 13,065 $ 14,115 $ 12,804 $ 66,538 $ 53,117 $ 33,117
Weighted average common shares outstanding 44,971,676 45,038,021 45,055,117 38,822,543 38,367,972 38,365,379 38,347,612 38,306,395 43,493,316 38,347,059 34,553,736
Basic Earnings Per Share $ 0.41 $ 0.46 $ 0.37 $ 0.28 $ 0.35 $ 0.34 $ 0.37 $ 0.33 $ 1.53 $ 1.39 $ 0.96
Diluted earnings per share                      
Net income available to common shareholders                 $ 66,538 $ 53,117 $ 33,117
Weighted average common shares outstanding 44,971,676 45,038,021 45,055,117 38,822,543 38,367,972 38,365,379 38,347,612 38,306,395 43,493,316 38,347,059 34,553,736
Effect of dilutive securities:                      
Weighted average common shares outstanding 45,103,065 45,113,730 45,130,408 38,906,172 38,488,861 38,534,970 38,519,401 38,468,810 43,597,595 38,495,231 34,760,438
Diluted Earnings Per Share $ 0.41 $ 0.46 $ 0.37 $ 0.28 $ 0.34 $ 0.34 $ 0.37 $ 0.33 $ 1.53 $ 1.38 $ 0.95
Restricted Stock [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities                 23,006 36,185 46,981
Stock Options [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities                 81,273 111,987 159,721