Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (34,535)us-gaap_NetIncomeLoss	$ 16,798us-gaap_NetIncomeLoss
Other comprehensive income:
Net unrealized gains on securities available for sale	74,546	34,138
Net unrealized gains on derivative instruments	14,167	32,467
Other comprehensive income	88,713	66,605
Comprehensive income	54,178us-gaap_ComprehensiveIncomeNetOfTax	83,403us-gaap_ComprehensiveIncomeNetOfTax
Dividends on preferred stock	5,481us-gaap_DividendsPreferredStockCash	5,480us-gaap_DividendsPreferredStockCash
Comprehensive income available to common shareholders	$ 48,697	$ 77,923
Comprehensive income per share - common stock basic and diluted	$ 0.50	$ 0.81

Comprehensive income (loss) available to common shareholders.

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Comprehensive income (loss) per share - common stock, basic and diluted.

+ References

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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.

+ References

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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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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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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