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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Taxes computed at statutory rate, amount | $ (26,196) | $ 82,475 | $ 80,244 |
State income taxes, net of federal income tax benefit, amount | (1,269) | 7,204 | 8,770 |
Tax-exempt interest, amount | (10,444) | (10,435) | (10,803) |
Life insurance contracts, amount | (4,857) | (3,901) | (2,019) |
Tax credits, amount | (8,072) | (10,293) | (11,344) |
Employee share-based compensation, amount | 1,351 | (842) | (1,380) |
FDIC assessment disallowance, amount | 2,094 | 1,895 | 2,818 |
Return to provision adjustment, amount | (970) | (1,459) | (9,942) |
Net operating loss carryback under CARES act, amount | (30,167) |  |  |
Other, net, amount | (1,041) | 715 | 2,002 |
Total included in net income | $ (79,571) | $ 65,359 | $ 58,346 |
Taxes computed at statutory rate | 21.00% | 21.00% | 21.00% | 35.00%
State income taxes, net of federal income tax benefit | 1.00% | 1.80% | 2.30% |
Tax-exempt interest | 8.40% | (2.70%) | (2.80%) |
Life insurance contracts | 3.90% | (1.00%) | (0.50%) |
Tax credits | 6.50% | (2.60%) | (3.00%) |
Employee share-based compensation | (1.10%) | (0.20%) | (0.30%) |
FDIC assessment disallowance | (1.70%) | 0.50% | 0.70% |
Return to provision adjustment | 0.80% | (0.40%) | (2.60%) |
Net operating loss carryback under CARES act | 24.20% |  |  |
Other, net | 0.80% | 0.20% | 0.50% |
Income tax expense | 63.80% | 16.60% | 15.30% |

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