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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net Investment Income [Line Items] |  |  |  |
Total interest income from available-for-sale securities | $ 10,118 | $ 11,697 | $ 20,763 | $ 23,565
Total interest income from held-to-maturity securities | 4,426 | 4,807 | 8,951 | 9,572
Total investment income | 14,544 | 16,504 | 29,714 | 33,137
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 9,821 | 11,290 | 20,130 | 22,735
Tax-advantaged | 297 | 407 | 633 | 830
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 2,932 | 3,048 | 5,842 | 5,926
Tax-advantaged | $ 1,494 | $ 1,759 | $ 3,109 | $ 3,646

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