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Income Taxes - Reconciliation of Statutory Income Tax Rate to Consolidated Effective Income 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] |  |  |
Federal income tax at statutory rate, rate | 21.00% | 35.00% | 35.00%
State franchise taxes, net of federal benefit, rate | 8.50% | 6.90% | 7.00%
Tax-exempt income, rate | (1.40%) | (2.40%) | (3.60%)
Tax credits, rate | (0.70%) | (0.60%) | (0.50%)
Deferred tax asset revalution adjustment, rate | 0.00% | 7.00% | 0.00%
Other, net, rate | 0.60% | (1.20%) | (0.40%)
Provision for income taxes, rate | 28.00% | 44.70% | 37.50%
Federal income tax at statutory rate | $ 44,334 | $ 66,078 | $ 56,800
State franchise taxes, net of federal benefit | 17,905 | 12,903 | 11,299
Tax-exempt income | (2,991) | (4,450) | (5,848)
Tax credits | (1,451) | (1,096) | (846)
Deferred tax asset revalution adjustment | 0 | 13,208 | 0
Other, net | 1,315 | (2,259) | (548)
Provision for income taxes | $ 59,112 | $ 84,384 | $ 60,857

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