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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Income (Expense)                      
Other income                 $ 1,039 $ 1,103 $ 1,013
Interest expense $ (8,450) $ (4,552) $ (3,781) $ (3,754) $ (3,568) $ (3,802) $ (3,277) $ (3,207) (20,537) (13,854) (13,222)
Employee benefit expense                 (44,013) (37,712) (32,682)
Other expense                 13,269 10,715 9,138
Income Before Income Tax                 32,713 27,781 24,256
Income Tax Benefit                 (8,801) (7,232) (6,155)
Net income 5,603 6,602 6,326 5,381 6,175 4,288 4,728 5,358 23,912 20,549 18,101
Preferred stock dividend                 (42) (125) (133)
Net Income Available to Common Shareholders $ 5,603 $ 6,602 $ 6,326 $ 5,339 $ 6,144 $ 4,257 $ 4,697 $ 5,327 23,870 20,424 17,968
Parent Company [Member]                      
Operating Income (Expense)                      
Dividend income from Bank                 20,000 30,470 12,500
Investment income                 33 15 12
Other income                 42 24 17
Interest expense                 (2,376) (2,009) (2,009)
Employee benefit expense                 (1,158) (1,093) (965)
Other expense                 1,279 910 883
Income Before Undistributed Income of Subsidiaries                 17,820 28,317 10,438
Undistributed Income of Subsidiaries                 5,938 (8,168) 6,814
Income Before Income Tax                 23,758 20,149 17,252
Income Tax Benefit                 154 400 849
Net income                 23,912 20,549 18,101
Preferred stock dividend                 (42) (125) (133)
Net Income Available to Common Shareholders                 $ 23,870 $ 20,424 $ 17,968