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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Abstract] |  |  |
Taxes computed at statutory rate, amount | $ 80,244 | $ 107,952 | $ 65,423
State income taxes, net of federal income tax benefit, amount | 8,770 | 4,288 | 2,104
Tax-exempt interest, amount | (10,803) | (18,870) | (14,497)
Bank owned life insurance contracts, amount | (2,019) | (5,360) | (4,833)
Tax credits, amount | (11,344) | (9,286) | (10,410)
Employee share-based compensation, amount | (1,380) | (5,824) |
FDIC assessment disallowance, amount | 2,818 |  |
Return to provision adjustment, amount | (9,942) | (120) | (549)
Impact of deferred tax asset re-measurement |  | 19,520 |
Other, net, amount | 2,002 | 502 | 389
Total included in net income | $ 58,346 | $ 92,802 | $ 37,627
Taxes computed at statutory rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit | 2.30% | 1.40% | 1.10%
Tax-exempt interest | (2.80%) | (6.10%) | (7.80%)
Bank owned life insurance | (0.50%) | (1.70%) | (2.60%)
Tax credits | (3.00%) | (3.10%) | (5.60%)
Employee share-based compensation | (0.30%) | (1.90%) |
FDIC assessment disallowance | 0.70% |  |
Return to provision adjustment | (2.60%) |  | (0.30%)
Impact of deferred tax asset re-measurement |  | 6.30% |
Other, net | 0.50% | 0.20% | 0.30%
Income tax expense | 15.30% | 30.10% | 20.10%

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