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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, 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 |  |  |  |  |  |  |  |  |  |  |
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | $ 18,077 | $ 7,908 | $ 4,265
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 36,136 | 32,857 | 33,972
Allocated income tax benefit/(expense) |  |  |  |  |  |  |  |  | (49,866) | (37,263) | (35,040)
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,180) | (1,636) | (1,717)
Net income | $ 19,497 | $ 21,710 | $ 23,182 | $ 22,050 | $ 18,620 | $ 17,982 | $ 17,493 | $ 16,579 | 86,439 | 70,674 | 66,170
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 29,455 | 28,175 | 26,043
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | 291 | 160 | 66
Other |  |  |  |  |  |  |  |  | 3 | 3 | 2
Total operating income |  |  |  |  |  |  |  |  | 29,749 | 28,338 | 26,111
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 2,122 | 2,096 | 1,998
Other |  |  |  |  |  |  |  |  | 770 | 583 | 628
Total operating expense |  |  |  |  |  |  |  |  | 2,892 | 2,679 | 2,626
Income before taxes |  |  |  |  |  |  |  |  | 26,857 | 25,659 | 23,485
Allocated income tax benefit/(expense) |  |  |  |  |  |  |  |  | 3,295 | 1,244 | (796)
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 30,152 | 26,903 | 22,689
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 57,429 | 44,172 | 44,653
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,142) | (401) | (1,172)
Net income |  |  |  |  |  |  |  |  | $ 86,439 | $ 70,674 | $ 66,170

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