Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 604,182us-gaap_CashAndDueFromBanks	$ 533,599us-gaap_CashAndDueFromBanks
Overnight investments	1,724,919us-gaap_OtherShortTermInvestments	859,324us-gaap_OtherShortTermInvestments
Investment securities available for sale	7,171,917us-gaap_AvailableForSaleSecurities	5,387,703us-gaap_AvailableForSaleSecurities
Investment securities held to maturity	518us-gaap_HeldToMaturitySecurities	907us-gaap_HeldToMaturitySecurities
Loans Receivable Held-for-sale, Amount	63,696	47,271
Loans and leases:
Less allowance for loan and lease losses	204,466	233,394
Net loans and leases	18,564,999	12,900,330
Loans and Leases Receivable, Gross	18,769,465	13,133,724
Premises and equipment	1,125,081us-gaap_PropertyPlantAndEquipmentNet	876,522us-gaap_PropertyPlantAndEquipmentNet
Other real estate owned:
Other Real Estate, Covered	22,982us-gaap_OtherRealEstateCovered	47,081us-gaap_OtherRealEstateCovered
Other Real Estate, Non Covered	70,454us-gaap_OtherRealEstateNonCovered	36,898us-gaap_OtherRealEstateNonCovered
Income earned not collected	57,254	48,390
FDIC loss share receivable	28,701us-gaap_FDICIndemnificationAsset	93,397us-gaap_FDICIndemnificationAsset
Goodwill	139,773us-gaap_Goodwill	102,625us-gaap_Goodwill
Other intangible assets	106,610	1,263
Other assets	394,027us-gaap_OtherAssets	258,568us-gaap_OtherAssets
Total assets	30,075,113us-gaap_Assets	21,193,878us-gaap_Assets
Liabilities
Noninterest-bearing	8,086,784	5,241,817
Interest-bearing	17,591,793	12,632,249
Total deposits	25,678,577us-gaap_Deposits	17,874,066us-gaap_Deposits
Debt, Current	987,184us-gaap_DebtCurrent	511,418us-gaap_DebtCurrent
Long-term obligations	351,320	510,769
FDIC loss share payable	116,535	109,378
Other liabilities	253,903us-gaap_OtherLiabilities	116,785us-gaap_OtherLiabilities
Total liabilities	27,387,519us-gaap_Liabilities	19,122,416us-gaap_Liabilities
Shareholders' Equity
Surplus	658,918us-gaap_AdditionalPaidInCapital	143,766us-gaap_AdditionalPaidInCapital
Retained earnings	2,069,647	1,943,345
Accumulated other comprehensive loss	(52,981)	(25,268)
Total shareholders' equity	2,687,594us-gaap_StockholdersEquity	2,071,462us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	30,075,113	21,193,878
Class A Common Stock
Shareholders' Equity
Common stock	11,005	8,586
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,033

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