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Income Taxes (Income Tax Computed by Applying U.S. Federal Statutory Income Tax Rate) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax expense computed at the statutory rate | $ 104,888 | $ 106,823 | $ 142,927
Effect of tax-exempt interest | (49,166) | (49,700) | (81,034)
Tax benefit on dividends paid in our 401k plan | (1,743) | (1,551) | (2,372)
Bank owned life insurance income | (774) | (710) | (1,116)
Non-deductible compensation | 1,708 | 210 | 158
Non-deductible FDIC premiums | 1,267 | 1,771 | 0
Non-deductible meals and entertainment | 1,299 | 1,193 | 983
Net tax benefit from stock-based compensation | (2,447) | (3,865) | (9,062)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate | 0 | (231) | (4,047)
Correction for prior year tax-exempt interest | 0 | 0 | (2,906)
Other | 838 | (177) | 683
Income tax expense, as reported | $ 55,870 | $ 53,763 | $ 44,214

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