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Income Taxes - Reconciliation of Statutory Income Tax Rate to Consolidated Effective Income Tax Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax at statutory rate, rate |  | 21.00% | 21.00% | 35.00%
State franchise taxes, net of federal benefit, rate |  | 8.40% | 8.50% | 6.90%
Tax-exempt income, rate |  | (1.10%) | (1.40%) | (2.40%)
Tax credits, rate |  | (0.70%) | (0.70%) | (0.60%)
Deferred tax asset revalution adjustment, rate |  |  |  | 7.00%
Other, net, rate |  | 1.00% | 0.60% | (1.20%)
Provision for income taxes, rate |  | 28.60% | 28.00% | 44.70%
Federal income tax at statutory rate |  | $ 61,126 | $ 44,334 | $ 66,078
State franchise taxes, net of federal benefit |  | 24,430 | 17,905 | 12,903
Tax-exempt income |  | (3,081) | (2,991) | (4,450)
Tax credits |  | (2,153) | (1,451) | (1,096)
Deferred tax asset revalution adjustment | $ 13,200 |  |  | 13,208
Other, net |  | 2,925 | 1,315 | (2,259)
Provision for income taxes |  | $ 83,247 | $ 59,112 | $ 84,384

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