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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, 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
Operating Income (Expense)                      
Other income                 $ 2,394 $ 2,141 $ 1,773
Interest expense $ (11,879) $ (12,248) $ (12,321) $ (11,093) $ (9,894) $ (8,499) $ (7,191) $ (6,015) (47,541) (31,599) (16,383)
Employee benefit expense                 (65,206) (56,623) (51,375)
Income Before Tax                 79,841 63,560 47,953
Income Tax Benefit                 (13,303) (10,443) (14,836)
Net Income Available to Common Shareholders                 66,538 53,117 33,117
Parent Company [Member]                      
Operating Income (Expense)                      
Dividend income from subsidiaries                 46,150 46,950 27,000
Other income                     540
Interest expense                 (3,209) (2,475) (2,791)
Employee benefit expense                 (1,687) (1,423) (1,094)
Other expense                 (416) (357) (326)
Income Before Undistributed Income of Subsidiaries                 40,838 42,695 23,329
Undistributed Income of Subsidiaries                 25,053 9,643 8,804
Income Before Tax                 65,891 52,338 32,133
Income Tax Benefit                 647 779 984
Net Income Available to Common Shareholders                 $ 66,538 $ 53,117 $ 33,117