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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
OPERATING INCOME |  |  |
Interest on interest-bearing deposits | $ 6,049 | $ 31,368 | $ 30,403
OPERATING EXPENSE |  |  |
Other | 43,859 | 44,829 | 39,887
Allocated income tax benefit | (23,926) | (34,683) | (33,938)
Amortization of stock-based compensation arrangements of subsidiaries | (1,516) | (1,277) | (1,352)
Net income | 99,586 | 134,879 | 125,814
Parent Company [Member] |  |  |
OPERATING INCOME |  |  |
Dividends from subsidiaries | 50,872 | 77,559 | 38,326
Interest on interest-bearing deposits | 1 | 1,150 | 1,151
Other | 886 | 451 | 16
Total operating income | 51,759 | 79,160 | 39,493
OPERATING EXPENSE |  |  |
Interest | 1,965 | 1,965 | 2,172
Other | 3,317 | 5,017 | 698
Total operating expense | 5,282 | 6,982 | 2,870
Income before taxes | 46,477 | 72,178 | 36,623
Allocated income tax benefit | 2,610 | 2,731 | 3,093
Income before equity in undistributed earnings of subsidiaries | 49,087 | 74,909 | 39,716
Equity in undistributed earnings of subsidiaries | 51,955 | 61,194 | 87,404
Amortization of stock-based compensation arrangements of subsidiaries | (1,456) | (1,224) | (1,306)
Net income | $ 99,586 | $ 134,879 | $ 125,814

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