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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Taxes computed at statutory rate, amount | $ 65,423 | $ 59,418 | $ 84,766
State income taxes, net of federal income tax benefit, amount | 1,917 | 2,595 | 4,649
Tax-exempt interest, amount | (14,497) | (7,849) | (6,301)
Bank owned life insurance | (4,833) | (3,798) | (3,554)
Tax credits, amount | (10,518) | (12,495) | (16,577)
Other, net, amount | 135 | 433 | 3,482
Total included in net income | $ 37,627 | $ 38,304 | $ 66,465
Taxes computed at statutory rate | 35.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit | 1.00% | 1.50% | 1.90%
Tax-exempt interest | (7.80%) | (4.60%) | (2.60%)
Bank owned life insurance | (2.60%) | (2.20%) | (1.50%)
Tax credits | (5.60%) | (7.40%) | (6.80%)
Other, net | 0.10% | 0.30% | 1.40%
Income tax expense | 20.10% | 22.60% | 27.40%
Hancock [Member] |  |  |
Total included in net income | $ (6,617) | $ (6,334) | $ (3,399)

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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