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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

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