Condensed Financial Information Of Parent Company Parent Company Information (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Cash	$ 313,226us-gaap_Cash	$ 147,422us-gaap_Cash
Other assets	272,205us-gaap_OtherAssets	193,462us-gaap_OtherAssets
Total assets	16,234,800us-gaap_Assets	6,533,363us-gaap_Assets
Subordinated debentures	433,583us-gaap_SubordinatedDebt	132,645us-gaap_SubordinatedDebt
Liabilities	12,728,375us-gaap_Liabilities	5,724,270us-gaap_Liabilities
Stockholders' Equity Attributable to Parent Only	3,506,425us-gaap_StockholdersEquity	809,093us-gaap_StockholdersEquity	589,121us-gaap_StockholdersEquity	546,203us-gaap_StockholdersEquity
Liabilities and Equity	16,234,800	6,533,363
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	309,220	21,835
Investments In Consolidated Banking Subsidiaries	3,119,642	911,200
Other assets	212,157	10,341
Total assets	3,641,019	943,376
Subordinated debentures	133,232	132,645
Other Liabilities	1,362	1,638
Liabilities	134,594	134,283
Stockholders' Equity Attributable to Parent Only	3,506,425	809,093
Liabilities and Equity	$ 3,641,019	$ 943,376

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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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