Business Segments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total interest income	$ 485,257	$ 493,632	$ 260,808
Interest expense	(76,782)us-gaap_InterestExpense	(83,960)us-gaap_InterestExpense	(103,518)us-gaap_InterestExpense
Net interest income	408,475us-gaap_InterestIncomeExpenseNet	409,672us-gaap_InterestIncomeExpenseNet	157,290us-gaap_InterestIncomeExpenseNet
Provision For Non Covered Loan And Lease Losses.	(54,960)	(67,559)	(13,854)
Provision for Covered Loan and Lease Losses, net	(5,680)	(5,335)	(9,827)
Total non-interest income (loss), net	17,323us-gaap_NoninterestIncome	17,095us-gaap_NoninterestIncome	26,055us-gaap_NoninterestIncome
Non-interest expenses	(242,725)us-gaap_NoninterestExpense	(264,136)us-gaap_NoninterestExpense	(131,808)us-gaap_NoninterestExpense
Total assets	7,449,109us-gaap_Assets	8,158,015us-gaap_Assets
Banking [Member]
Segment Reporting Information [Line Items]
Total interest income	435,580	445,363	165,492
Interest expense	(34,721)	(42,044)	(22,232)
Net interest income	400,859	403,319	143,260
Provision For Non Covered Loan And Lease Losses.	(54,960)	(67,559)	(13,854)
Provision for Covered Loan and Lease Losses, net	(5,680)	(5,335)	(9,827)
Total non-interest income (loss), net	(13,389)	(17,438)	(5,886)
Non-interest expenses	(213,935)	(222,408)	(90,183)
Intersegment revenues	1,410	618	1,594
Intersegment expenses	(327)	0	0
Income (loss) before Income Taxes, Parent	113,978	91,197	25,104
Total assets	6,454,015	5,820,726	3,223,963
Financial Services
Segment Reporting Information [Line Items]
Total interest income	174	354	0
Interest expense	0	0	0
Net interest income	174	354	0
Provision For Non Covered Loan And Lease Losses.	0	0	0
Provision for Covered Loan and Lease Losses, net	0	0	0
Total non-interest income (loss), net	28,525	30,614	25,155
Non-interest expenses	(21,748)	(26,603)	(28,718)
Intersegment revenues	0	0	0
Intersegment expenses	(1,089)	(1,813)	(1,183)
Income (loss) before Income Taxes, Parent	5,862	2,552	(4,746)
Total assets	21,644	23,280	18,875
Treasury [Member]
Segment Reporting Information [Line Items]
Total interest income	49,503	47,915	95,316
Interest expense	(42,061)	(41,916)	(81,286)
Net interest income	7,442	5,999	14,030
Provision For Non Covered Loan And Lease Losses.	0	0	0
Provision for Covered Loan and Lease Losses, net	0	0	0
Total non-interest income (loss), net	2,187	3,919	6,786
Non-interest expenses	(7,042)	(15,125)	(12,907)
Intersegment revenues	327	1,195	0
Intersegment expenses	(321)	0	(411)
Income (loss) before Income Taxes, Parent	2,593	(4,012)	7,498
Total assets	1,940,504	3,084,409	6,839,661
Major Segment [Member]
Segment Reporting Information [Line Items]
Total interest income	485,257	493,632	260,808
Interest expense	(76,782)	(83,960)	(103,518)
Net interest income	408,475	409,672	157,290
Provision For Non Covered Loan And Lease Losses.	(54,960)	(67,559)	(13,854)
Provision for Covered Loan and Lease Losses, net	(5,680)	(5,335)	(9,827)
Total non-interest income (loss), net	17,323	17,095	26,055
Non-interest expenses	(242,725)	(264,136)	(131,808)
Intersegment revenues	1,737	1,813	1,594
Intersegment expenses	(1,737)	(1,813)	(1,594)
Income (loss) before Income Taxes, Parent	122,433	89,737	27,856
Total assets	8,416,163	8,928,415	10,082,499
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Total interest income	0	0	0
Interest expense	0	0	0
Net interest income	0	0	0
Provision For Non Covered Loan And Lease Losses.	0	0	0
Provision for Covered Loan and Lease Losses, net	0	0	0
Total non-interest income (loss), net	0	0	0
Non-interest expenses	0	0	0
Intersegment revenues	(1,737)	(1,813)	(1,594)
Intersegment expenses	1,737	1,813	1,594
Income (loss) before Income Taxes, Parent	0	0	0
Total assets	$ (967,054)	$ (770,400)	$ (870,741)

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Provision (Recapture) For Covered Loan And Lease Losses, Net.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Costs of sales and operating expenses for the period incurred from transactions with related parties.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The net amount of operating interest income (expense).

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Total aggregate amount of all noninterest expense.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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