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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Comprehensive Income
Net income	$ 153,151us-gaap_NetIncomeLoss	$ 126,351us-gaap_NetIncomeLoss	$ 107,835us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on securities available for sale arising during period (net of tax effects of $29870, $(56,048), and $2,701)	55,474us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(104,088)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	5,018us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for gains on securities available for sale included in net income (net of tax effects of $(449), $(3,360), and $(13,456)),	(834)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(6,241)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(24,990)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $286, $481, and $364, )	531us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	893us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	675us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax
Other comprehensive income (loss), net of tax	55,171us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(109,436)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(19,297)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 208,322us-gaap_ComprehensiveIncomeNetOfTax	$ 16,915us-gaap_ComprehensiveIncomeNetOfTax	$ 88,538us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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