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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, 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 |  |  |  |  |  |  |  |  |  |  |
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | $ 31,368 | $ 30,403 | $ 18,077
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 44,829 | 39,887 | 36,136
Allocated income tax benefit |  |  |  |  |  |  |  |  | (34,683) | (33,938) | (49,866)
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,277) | (1,352) | (1,180)
Net income | $ 35,507 | $ 33,368 | $ 34,167 | $ 31,837 | $ 32,725 | $ 32,883 | $ 30,586 | $ 29,620 | 134,879 | 125,814 | 86,439
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 77,559 | 38,326 | 29,455
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | 1,150 | 1,151 | 291
Other |  |  |  |  |  |  |  |  | 451 | 16 | 3
Total operating income |  |  |  |  |  |  |  |  | 79,160 | 39,493 | 29,749
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 1,965 | 2,172 | 2,122
Other |  |  |  |  |  |  |  |  | 5,017 | 698 | 770
Total operating expense |  |  |  |  |  |  |  |  | 6,982 | 2,870 | 2,892
Income before taxes |  |  |  |  |  |  |  |  | 72,178 | 36,623 | 26,857
Allocated income tax benefit |  |  |  |  |  |  |  |  | 2,731 | 3,093 | 3,295
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 74,909 | 39,716 | 30,152
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 61,194 | 87,404 | 57,429
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,224) | (1,306) | (1,142)
Net income |  |  |  |  |  |  |  |  | $ 134,879 | $ 125,814 | $ 86,439

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