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Parent Company Only Financial Information - Condensed Statements of Income (Detail) - USD ($)
$ 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
Dividends from:                      
Income tax benefit                 $ (6,510) $ (12,392) $ (7,171)
Net Income $ 8,945 $ 9,236 $ 8,441 $ 7,097 $ 3,451 $ 7,246 $ 6,683 $ 6,480 33,719 23,860 20,540
Parent Company                      
Dividends from:                      
Bank subsidiary                 12,029 8,840 8,700
Non-bank subsidiaries                 3,000 2,250 1,200
Other                 212 220 230
Total income                 15,241 11,310 10,130
Expenses                 (5,184) (4,957) (2,611)
Income before income taxes and equity in undistributed net income of subsidiaries                 10,057 6,353 7,519
Income tax benefit                 1,116 1,614 813
Equity in undistributed net income of bank subsidiary                 24,031 17,430 13,184
Distributions in excess of net income of non-bank subsidiaries                 (1,485) (1,537) (976)
Net Income                 $ 33,719 $ 23,860 $ 20,540