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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Taxes computed at statutory rate, amount | $ 138,431 | $ 119,292 | $ (26,196) |
State income taxes, net of federal income tax benefit, amount | 13,272 | 9,048 | (1,269) |
Tax-exempt interest, amount | (8,612) | (9,100) | (10,444) |
Life insurance contracts, amount | (1,812) | (2,653) | (4,857) |
Tax credits, amount | (8,039) | (7,889) | (8,072) |
Employee share-based compensation, amount | (2,084) | (1,671) | 1,351 |
FDIC assessment disallowance, amount | 1,836 | 1,609 | 2,094 |
Net operating loss carryback under CARES act, amount | 238 | (4,948) | (30,167) |
Other, net, amount | 1,877 | 1,153 | (2,011) |
Total expense (benefit) included in net income | $ 135,107 | $ 104,841 | $ (79,571) |
Taxes computed at statutory rate | 21.00% | 21.00% | 21.00% | 35.00%
State income taxes, net of federal income tax benefit | 2.00% | 1.60% | 1.00% |
Tax-exempt interest | (1.30%) | (1.60%) | 8.40% |
Life insurance contracts | (0.30%) | (0.50%) | 3.90% |
Tax credits | (1.20%) | (1.40%) | 6.50% |
Employee share-based compensation | (0.30%) | (0.30%) | (1.10%) |
FDIC assessment disallowance | 0.30% | 0.30% | (1.70%) |
Net operating loss carryback under CARES act |  | (0.90%) | 24.20% |
Other, net | 0.30% | 0.30% | 1.60% |
Income tax expense | 20.50% | 18.50% | 63.80% |

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