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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (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 |  |  |  |  |  |  |  |  |  |  |
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | $ 30,403 | $ 18,077 | $ 7,908
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 39,887 | 36,136 | 32,857
Allocated income tax benefit |  |  |  |  |  |  |  |  | (33,938) | (49,866) | (37,263)
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,352) | (1,180) | (1,636)
Net income | $ 32,725 | $ 32,883 | $ 30,586 | $ 29,620 | $ 19,497 | $ 21,710 | $ 23,182 | $ 22,050 | 125,814 | 86,439 | 70,674
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 38,326 | 29,455 | 28,175
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | 1,151 | 291 | 160
Other |  |  |  |  |  |  |  |  | 16 | 3 | 3
Total operating income |  |  |  |  |  |  |  |  | 39,493 | 29,749 | 28,338
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 2,172 | 2,122 | 2,096
Other |  |  |  |  |  |  |  |  | 698 | 770 | 583
Total operating expense |  |  |  |  |  |  |  |  | 2,870 | 2,892 | 2,679
Income before taxes |  |  |  |  |  |  |  |  | 36,623 | 26,857 | 25,659
Allocated income tax benefit |  |  |  |  |  |  |  |  | 3,093 | 3,295 | 1,244
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 39,716 | 30,152 | 26,903
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 87,404 | 57,429 | 44,172
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,306) | (1,142) | (401)
Net income |  |  |  |  |  |  |  |  | $ 125,814 | $ 86,439 | $ 70,674

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