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Income Taxes - Reconciliation of Tax Expense at the Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax expense at the federal statutory tax rate | $ 33,546 | $ 47,708 | $ 37,778
Increase (decrease) in tax expense from: |  |  |
Tax-exempt income, net | (510) | (829) | (756)
Modified endowment life contracts | (558) | (921) | (852)
Share based compensation excess tax benefit | (917) | (2,354) |
State tax expense, net of federal tax benefit | 5,595 | 3,840 | 3,250
Write-down of net deferred tax asset |  | 4,331 |
Utilization of tax credits: |  |  |
New markets tax credits | (1,422) | (1,151) | (1,254)
Low-income housing tax credits, net of amortization | (1,273) | (1,589) | (1,424)
Other tax credits |  |  | (319)
Other, net | (523) | 831 | 840
Total income taxes | $ 33,938 | $ 49,866 | $ 37,263

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