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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Net Investment Income [Line Items] |  |  |  |
Total interest income from available-for-sale securities | $ 8,449 | $ 10,118 | $ 18,498 | $ 20,763
Total interest income from held-to-maturity securities | 3,660 | 4,426 | 7,658 | 8,951
Total investment income | 12,109 | 14,544 | 26,156 | 29,714
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 8,244 | 9,821 | 18,069 | 20,130
Tax-advantaged | 205 | 297 | 429 | 633
Total interest income from available-for-sale securities | 8,449 | 10,118 | 18,498 | 20,763
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 2,447 | 2,932 | 5,145 | 5,842
Tax-advantaged | 1,213 | 1,494 | 2,513 | 3,109
Total interest income from held-to-maturity securities | $ 3,660 | $ 4,426 | $ 7,658 | $ 8,951

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