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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

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