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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Investment Income [Line Items] |  |  |
Total interest income from available-for-sale securities | $ 39,330 | $ 45,988 | $ 49,778
Total interest income from held-to-maturity securities | 17,388 | 18,901 | 21,015
Total investment income | 56,718 | 64,889 | 70,793
Investment securities available-for-sale [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Taxable | 38,189 | 44,423 | 47,596
Tax-advantaged | 1,141 | 1,565 | 2,182
Total interest income from available-for-sale securities | 39,330 | 45,988 | 49,778
Investment securities held-to-maturity [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Taxable | 11,498 | 11,848 | 12,558
Tax-advantaged | 5,890 | 7,053 | 8,457
Total interest income from held-to-maturity securities | $ 17,388 | $ 18,901 | $ 21,015

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