PARENT COMPANY AND REGULATORY RESTRICTIONS (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 86,007	$ 49,348	$ 177,375	$ 257,072
Investment securities available for sale	1,229,018us-gaap_AvailableForSaleSecurities	1,407,999us-gaap_AvailableForSaleSecurities
Total assets	4,852,987us-gaap_Assets	4,741,198us-gaap_Assets
Liabilities and Shareholders' Equity
Long-term debt	92,785us-gaap_LongTermDebt	92,799us-gaap_LongTermDebt
Other liabilities	43,861us-gaap_OtherLiabilities	44,037us-gaap_OtherLiabilities
Total liabilities	4,284,946us-gaap_Liabilities	4,081,024us-gaap_Liabilities
Shareholders' equity:
Preferred stock, no par value, authorized 1,100,000 shares; issued and outstanding none at December 31, 2014 and 2013
Common stock, no par value, authorized 185,000,000 shares, issued and outstanding 35,233,674 and 42,107,633 shares at December 31, 2014 and 2013, respectively	642,205us-gaap_CommonStockValue	784,547us-gaap_CommonStockValue
Surplus	79,716us-gaap_AdditionalPaidInCapital	75,498us-gaap_AdditionalPaidInCapital
Accumulated deficit	(157,039)	(184,087)
Accumulated other comprehensive income (loss)	3,159	(15,845)	(830)	2,164
Total shareholders' equity	568,041us-gaap_StockholdersEquity	660,113us-gaap_StockholdersEquity
Total liabilities and equity	4,852,987	4,741,198
Parent
Assets
Cash and cash equivalents	22,775	19,629	46,686	45,626
Investment securities available for sale	877	875
Investment in subsidiary bank, at equity in underlying net assets	612,505	710,122
Investment in other subsidiaries, at equity in underlying assets		554
Accrued interest receivable and other assets	26,136	23,202
Total assets	662,293	754,382
Liabilities and Shareholders' Equity
Long-term debt	92,785	92,785
Other liabilities	1,467	1,484
Total liabilities	94,252	94,269
Shareholders' equity:
Preferred stock, no par value, authorized 1,100,000 shares; issued and outstanding none at December 31, 2014 and 2013
Common stock, no par value, authorized 185,000,000 shares, issued and outstanding 35,233,674 and 42,107,633 shares at December 31, 2014 and 2013, respectively	642,205	784,547
Surplus	79,716	75,498
Accumulated deficit	(157,039)	(184,087)
Accumulated other comprehensive income (loss)	3,159	(15,845)
Total shareholders' equity	568,041	660,113
Total liabilities and equity	$ 662,293	$ 754,382

Represents the entity's ownership percentage in the subsidiary bank multiplied by the subsidiary bank's total equity.

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Represents the entity's ownership percentage in the other subsidiaries multiplied by the other subsidiaries' total equity.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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Carrying amount of interest earned but not received (also called accrued interest or accrued interest receivable) and carrying amounts of assets not separately disclosed.

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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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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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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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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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