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Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of expected income tax expense to actual income tax expense
Computed “expected” tax expense	$ 45,099	$ 91,702	$ 139,005
Tax-exempt income	(12,913)	(13,250)	(14,509)
Tax credits	(22,407)	(17,918)	(17,888)
Non-taxable gain on acquisition	0	0	(11,310)
Non-U.S. Loss	1,806	1,741	0
Other	1,073	3,165	4,338
Total income tax expense (benefit)	$ 12,658	$ 65,440	$ 99,636

X

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to gains recognized as a result of the price paid to acquire a business being less than the fair value of the net assets of the business acquired.

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Effective Income Tax Rate Reconciliation, Non-U.S. Loss, Amount

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- Definition

Qualified Affordable housing tax credits and other tax benefits amount, that only includes credits

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Income Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6515339

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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