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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

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