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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic earnings per share                      
Net income $ (13,133) $ (13,065) $ (14,115) $ (12,804) $ (7,650) $ (8,171) $ (9,072) $ (8,224) $ (53,117) $ (33,117) $ (23,912)
Less: Preferred stock dividends                 0 0 42
Net Income Available to Common Shareholders                 $ (53,117) $ (33,117) $ (23,870)
Weighted average common shares outstanding 38,367,972 38,365,379 38,347,612 38,306,395 37,711,200 33,870,240 33,264,697 33,263,289 38,347,059 34,553,736 29,981,592
Basic Earnings Per Share $ 0.35 $ 0.34 $ 0.37 $ 0.33 $ 0.20 $ 0.24 $ 0.27 $ 0.25 $ 1.39 $ 0.96 $ 0.80
Diluted earnings per share                      
Net income available to common shareholders                 $ 53,117 $ 33,117 $ 23,870
Weighted average common shares outstanding 38,367,972 38,365,379 38,347,612 38,306,395 37,711,200 33,870,240 33,264,697 33,263,289 38,347,059 34,553,736 29,981,592
Effect of dilutive securities:                      
Weighted average common shares outstanding 38,488,861 38,534,970 38,519,401 38,468,810 37,893,014 34,072,909 33,483,584 33,489,106 38,495,231 34,760,438 30,123,614
Diluted Earnings Per Share $ 0.34 $ 0.34 $ 0.37 $ 0.33 $ 0.20 $ 0.24 $ 0.27 $ 0.25 $ 1.38 $ 0.95 $ 0.79
Restricted Stock [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities                 36,185 46,981 39,829
Stock Options [Member]                      
Effect of dilutive securities:                      
Effect of dilutive securities                 111,987 159,721 102,193