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Income Taxes (Reconciliation Of Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Computed tax expense	$ 86,598us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 46,234us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 47,359us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax-exempt interest income	(27,839)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(26,381)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(27,789)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Dividends received deduction	(2,027)us-gaap_IncomeTaxReconciliationDeductionsDividends	(2,239)us-gaap_IncomeTaxReconciliationDeductionsDividends	(1,482)us-gaap_IncomeTaxReconciliationDeductionsDividends
State tax expense	3,872us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	4,944us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,918us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible expenses	9,900us-gaap_IncomeTaxReconciliationNondeductibleExpense	190us-gaap_IncomeTaxReconciliationNondeductibleExpense	317us-gaap_IncomeTaxReconciliationNondeductibleExpense
Other, net	(1,028)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(2,795)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(1,924)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense	$ 69,476us-gaap_IncomeTaxExpenseBenefit	$ 19,953us-gaap_IncomeTaxExpenseBenefit	$ 18,399us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to 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 deduction for dividend.

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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 nondeductible expenses.

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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 tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and 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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