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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Income (Expense)                      
Other income                 $ 1,773 $ 1,039 $ 1,103
Interest expense $ (5,319) $ (4,191) $ (3,607) $ (3,266) $ (8,450) $ (4,552) $ (3,781) $ (3,754) (16,383) (20,537) (13,854)
Employee benefit expense                 (51,375) (44,013) (37,712)
Income Before Income Tax                 47,953 32,713 27,781
Income Tax Benefit                 (14,836) (8,801) (7,232)
Net income 7,650 8,171 9,072 8,224 5,603 6,602 6,326 5,381 33,117 23,912 20,549
Preferred stock dividend                   (42) (125)
Net Income Available to Common Shareholders $ 7,650 $ 8,171 $ 9,072 $ 8,224 $ 5,603 $ 6,602 $ 6,326 $ 5,339 33,117 23,870 20,424
Parent Company [Member]                      
Operating Income (Expense)                      
Dividend income from Bank                 27,000 20,000 30,470
Investment income                   33 15
Other income                 540 42 24
Interest expense                 (2,791) (2,376) (2,009)
Employee benefit expense                 (1,094) (1,158) (1,093)
Other expense                 (326) 1,279 910
Income Before Undistributed Income of Subsidiaries                 23,329 17,820 28,317
Undistributed Income of Subsidiaries                 8,804 5,938 (8,168)
Income Before Income Tax                 32,133 23,758 20,149
Income Tax Benefit                 984 154 400
Net income                 33,117 23,912 20,549
Preferred stock dividend                   (42) (125)
Net Income Available to Common Shareholders                 $ 33,117 $ 23,870 $ 20,424