Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 480,998us-gaap_CashAndDueFromBanks	$ 571,171us-gaap_CashAndDueFromBanks
Interest-bearing deposits in banks	216,426us-gaap_InterestBearingDepositsInBanks	346,651us-gaap_InterestBearingDepositsInBanks
Total cash and cash equivalents	697,424	917,822
Investment securities:
Held-to-maturity	2,903,609	2,935,688
Available-for-sale	3,545,288us-gaap_AvailableForSaleSecurities	3,273,174us-gaap_AvailableForSaleSecurities
Other investments	148,654us-gaap_OtherInvestments	180,803us-gaap_OtherInvestments
Loans held for sale	13,428	11,622
Loans
Loans	15,326,147	14,300,972
Allowance for loan losses	(143,649)	(141,252)
Net loans	15,182,498	14,159,720
Premises and equipment, net	332,297us-gaap_PropertyPlantAndEquipmentNet	327,054us-gaap_PropertyPlantAndEquipmentNet
Goodwill	741,740us-gaap_Goodwill	741,740us-gaap_Goodwill
Intangible assets	71,020	82,755
Covered other real estate	49,641us-gaap_OtherRealEstateCovered	65,234us-gaap_OtherRealEstateCovered
Accrued interest receivable and other assets	1,216,748us-gaap_OtherAssets	1,216,416us-gaap_OtherAssets
Assets	24,902,347us-gaap_Assets	23,912,028us-gaap_Assets
Deposits:
Noninterest-bearing	5,786,662	5,459,029
Interest-bearing	3,028,888	3,026,735
Savings and money market accounts	8,399,612us-gaap_DepositsSavingsDeposits	8,587,167us-gaap_DepositsSavingsDeposits
Certificates and other time deposits	2,289,503us-gaap_TimeDeposits	2,460,670us-gaap_TimeDeposits
Total deposits	19,504,665us-gaap_Deposits	19,533,601us-gaap_Deposits
Federal funds purchased and securities sold under agreements to repurchase	1,272,591	851,535
Wholesale borrowings	428,071us-gaap_OtherBorrowings	200,600us-gaap_OtherBorrowings
Long-term debt	505,192us-gaap_LongTermDebt	324,428us-gaap_LongTermDebt
Accrued taxes, expenses and other liabilities	357,547	298,970
Total liabilities	22,068,066us-gaap_Liabilities	21,209,134us-gaap_Liabilities
Shareholders' equity:
Capital surplus	1,393,090us-gaap_AdditionalPaidInCapital	1,390,643us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss	(71,892)	(66,876)
Retained earnings	1,404,717	1,277,975
Treasury stock, at cost: December 31, 2014 - 4,793,566 shares; December 31, 2013 - 5,127,332 shares	(122,571)us-gaap_TreasuryStockValue	(129,785)us-gaap_TreasuryStockValue
Total shareholders' equity	2,834,281us-gaap_StockholdersEquity	2,702,894us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	24,902,347	23,912,028
Series A Non-Cumulative Perpetual Preferred Stock
Shareholders' equity:
5.875% Non-Cumulative Perpetual Preferred stock, Series A, without par value: authorized 115,000 shares; 100,000 issued	100,000	100,000
Common stock
Shareholders' equity:
Common stock warrant	3,000	3,000
Common Stock, without par value; authorized 300,000,000 shares; issued: December 31, 2014 - 170,183,540 shares; December 31, 2013 - 170,183,540 shares	127,937	127,937
Fair Value, Inputs, Level 1 [Member]
Investment securities:
Available-for-sale	2,974	3,036
Other investments	0	0
Loans held for sale	0	0
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Available-for-sale	3,203,127	2,922,527
Other investments		180,803
Loans held for sale		$ 11,622

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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Other investments not otherwise specified in the taxonomy.

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Carrying amount of other real estate covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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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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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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