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Consolidated Statements of Comprehensive Income (Loss) (Audited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 85,181us-gaap_NetIncomeLoss	$ 98,446us-gaap_NetIncomeLoss	$ 24,555us-gaap_NetIncomeLoss
Other comprehensive income (loss) before tax:
Unrealized gain (loss) on securities available-for-sale	19,843us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(62,080)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	63,152us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Realized gain on investment securities included in net income	(4,366)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	0us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	(74,210)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
Unrealized gain (loss) on cash flow hedges	2,322us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	6,758us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	(7,702)us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
Realized loss on cash flow hedges included in net income	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	37,463us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Other comprehensive income (loss) before taxes	17,799us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	(55,322)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	18,703us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax effect	(1,279)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	2,633us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	46us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other Comprehensive Income (Loss) After taxes	16,520us-gaap_OtherComprehensiveIncomeLossNetOfTax	(52,689)us-gaap_OtherComprehensiveIncomeLossNetOfTax	18,749us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 101,701us-gaap_ComprehensiveIncomeNetOfTax	$ 45,757us-gaap_ComprehensiveIncomeNetOfTax	$ 43,304us-gaap_ComprehensiveIncomeNetOfTax

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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