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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Expense (Benefit) Reconciliation |  |  |
Income tax expense at statutory federal income tax rate | $ 101,779 | $ 160,653 | $ 114,944
State income tax expense, net of federal income tax benefit | 11,168 | 33,764 | 17,270
Adjustment related to reduction in U.S. federal statutory income tax rate | 0 | 0 | (9,865)
Low income housing tax credits and other tax benefits | (13,858) | (8,454) | (6,421)
Low income housing tax credit amortization | 11,247 | 6,871 | 5,316
Goodwill impairment | 9,424 | 0 | 0
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount | 9,207 | 6,564 | 3,599
FDIC premiums | 4,744 | 5,802 | 2,529
Executive compensation | 1,501 | 6,385 | 443
General business tax credits | (657) | (678) | (1,163)
Excess tax benefit from share-based compensation | 311 | (1,337) | (2,801)
Change in valuation allowance | 0 | 0 | (3,431)
Other, net | (5,482) | 4,793 | 5,656
Total income tax expense | $ 110,970 | $ 201,235 | $ 118,878
Effective tax rate | 22.90% | 26.30% | 21.70%
Reclassification from adoption of ASU 2018-02 |  |  | $ 0

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