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Condensed Financial Information (Parent Company Only) - 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
Operating Income (Expense)                      
Other income                 $ 2,141 $ 1,773 $ 1,039
Interest expense $ (9,894) $ (8,499) $ (7,191) $ (6,015) $ (5,319) $ (4,191) $ (3,607) $ (3,266) (31,599) (16,383) (20,537)
Employee benefit expense                 (56,623) (51,375) (44,013)
Income Before Tax                 63,560 47,953 32,713
Income Tax Benefit                 (10,443) (14,836) (8,801)
Net Income $ 13,133 $ 13,065 $ 14,115 $ 12,804 $ 7,650 $ 8,171 $ 9,072 $ 8,224 53,117 33,117 23,912
Preferred stock dividend                 0 0 (42)
Net Income Available to Common Shareholders                 53,117 33,117 23,870
Parent Company [Member]                      
Operating Income (Expense)                      
Dividend income from subsidiaries                 46,950 27,000 20,000
Investment income                     33
Other income                   540 42
Interest expense                 (2,475) (2,791) (2,376)
Employee benefit expense                 (1,423) (1,094) (1,158)
Other expense                 (357) (326) 1,279
Income Before Undistributed Income of Subsidiaries                 42,695 23,329 17,820
Undistributed Income of Subsidiaries                 9,643 8,804 5,938
Income Before Tax                 52,338 32,133 23,758
Income Tax Benefit                 779 984 154
Net Income                 53,117 33,117 23,912
Preferred stock dividend                     (42)
Net Income Available to Common Shareholders                 $ 53,117 $ 33,117 $ 23,870