| **CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (USD $)**                                                                                                                                                                           | Dec. 31, 2014                                                      | Dec. 31, 2013                                                       |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------|---------------------------------------------------------------------|
| **Assets**                                                                                                                                                                                                                           |                                                               |                                                                |
| Cash and due from banks                                                                                                                                                                                                              | $ 72,276,000us-gaap_CashAndDueFromBanks                            | $ 74,427,000us-gaap_CashAndDueFromBanks                             |
| Interest-bearing bank deposits                                                                                                                                                                                                       | 2,262,000us-gaap_InterestBearingDepositsInBanks                    | 3,012,000us-gaap_InterestBearingDepositsInBanks                     |
| Securities available for sale, at fair value                                                                                                                                                                                         | (1,309,819,000)us-gaap_AvailableForSaleSecurities                  | (1,318,365,000)us-gaap_AvailableForSaleSecurities                   |
| Other investments                                                                                                                                                                                                                    | 44,545,000us-gaap_FederalHomeLoanBankStock                         | 35,444,000us-gaap_FederalHomeLoanBankStock                          |
| Loans held for sale                                                                                                                                                                                                                  | 2,502,000us-gaap_LoansReceivableHeldForSaleNet                     | 0us-gaap_LoansReceivableHeldForSaleNet                              |
| **Loans:**                                                                                                                                                                                                                           |                                                               |                                                                |
| Portfolio loans                                                                                                                                                                                                                      | 4,457,308,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome   | 4,283,833,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome    |
| Allowance for credit losses                                                                                                                                                                                                          | (52,051,000)us-gaap_LoansAndLeasesReceivableAllowance              | (54,225,000)us-gaap_LoansAndLeasesReceivableAllowance               |
| Net loans                                                                                                                                                                                                                            | 4,405,257,000us-gaap_LoansAndLeasesReceivableNetReportedAmount     | 4,229,608,000us-gaap_LoansAndLeasesReceivableNetReportedAmount      |
| Premises and equipment, net                                                                                                                                                                                                          | 64,989,000us-gaap_PropertyPlantAndEquipmentNet                     | 67,940,000us-gaap_PropertyPlantAndEquipmentNet                      |
| Other real estate owned                                                                                                                                                                                                              | 7,197,000us-gaap_RealEstateAcquiredThroughForeclosure              | 11,728,000us-gaap_RealEstateAcquiredThroughForeclosure              |
| Goodwill                                                                                                                                                                                                                             | 161,429,000us-gaap_Goodwill                                        | 159,956,000us-gaap_Goodwill                                         |
| Amortizing intangibles, net                                                                                                                                                                                                          | 1,665,000us-gaap_IntangibleAssetsNetExcludingGoodwill              | 1,311,000us-gaap_IntangibleAssetsNetExcludingGoodwill               |
| Bank owned life insurance                                                                                                                                                                                                            | 177,567,000us-gaap_BankOwnedLifeInsurance                          | 174,372,000us-gaap_BankOwnedLifeInsurance                           |
| Other assets                                                                                                                                                                                                                         | 110,777,000us-gaap_OtherAssets                                     | 138,698,000us-gaap_OtherAssets                                      |
| Total assets                                                                                                                                                                                                                         | 6,360,285,000us-gaap_Assets                                        | 6,214,861,000us-gaap_Assets                                         |
| **Deposits (all domestic):**                                                                                                                                                                                                         |                                                               |                                                                |
| Noninterest-bearing                                                                                                                                                                                                                  | 989,027,000us-gaap_NoninterestBearingDepositLiabilitiesDomestic    | 912,361,000us-gaap_NoninterestBearingDepositLiabilitiesDomestic     |
| Interest-bearing                                                                                                                                                                                                                     | 3,326,484,000us-gaap_InterestBearingDepositLiabilitiesDomestic     | 3,691,502,000us-gaap_InterestBearingDepositLiabilitiesDomestic      |
| Total deposits                                                                                                                                                                                                                       | 4,315,511,000us-gaap_Deposits                                      | 4,603,863,000us-gaap_Deposits                                       |
| Short-term borrowings                                                                                                                                                                                                                | 1,105,876,000us-gaap_ShortTermBorrowings                           | 626,615,000us-gaap_ShortTermBorrowings                              |
| Subordinated debentures                                                                                                                                                                                                              | 72,167,000us-gaap_SubordinatedDebt                                 | 72,167,000us-gaap_SubordinatedDebt                                  |
| Other long-term debt                                                                                                                                                                                                                 | 89,459,000us-gaap_OtherLongTermDebt                                | 144,385,000us-gaap_OtherLongTermDebt                                |
| Total long-term debt                                                                                                                                                                                                                 | 161,626,000us-gaap_LongTermDebt                                    | 216,552,000us-gaap_LongTermDebt                                     |
| Other liabilities                                                                                                                                                                                                                    | 61,127,000us-gaap_OtherLiabilities                                 | 56,134,000us-gaap_OtherLiabilities                                  |
| Total liabilities                                                                                                                                                                                                                    | 5,644,140,000us-gaap_Liabilities                                   | 5,503,164,000us-gaap_Liabilities                                    |
| **Shareholders’ Equity**                                                                                                                                                                                                      |                                                               |                                                                |
| Preferred stock, $1 par value per share, 3,000,000 shares authorized, none issued                                                                                                                                                    | 0us-gaap_PreferredStockValue                                       | 0us-gaap_PreferredStockValue                                        |
| Common stock, $1 par value per share, 200,000,000 shares authorized; 105,563,455 shares issued as of December 31, 2014 and 2013; and 91,723,028 shares and 95,245,215 shares outstanding at December 31, 2014 and 2013, respectively | 105,563,000us-gaap_CommonStockValue                                | 105,563,000us-gaap_CommonStockValue                                 |
| Additional paid-in capital                                                                                                                                                                                                           | 365,615,000us-gaap_AdditionalPaidInCapital                         | 365,333,000us-gaap_AdditionalPaidInCapital                          |
| Retained earnings                                                                                                                                                                                                                    | 353,027,000us-gaap_RetainedEarningsAccumulatedDeficit              | 334,748,000us-gaap_RetainedEarningsAccumulatedDeficit               |
| Accumulated other comprehensive (loss) income, net                                                                                                                                                                                   | (4,499,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (20,588,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
| Treasury stock (13,840,427 and 10,318,240 shares at December 31, 2014 and 2013, respectively)                                                                                                                                        | (103,561,000)us-gaap_TreasuryStockValue                            | (73,359,000)us-gaap_TreasuryStockValue                              |
| Total shareholders’ equity                                                                                                                                                                                                    | 716,145,000us-gaap_StockholdersEquity                              | 711,697,000us-gaap_StockholdersEquity                               |
| Total liabilities and shareholders’ equity                                                                                                                                                                                    | $ 6,360,285,000us-gaap_LiabilitiesAndStockholdersEquity            | $ 6,214,861,000us-gaap_LiabilitiesAndStockholdersEquity             |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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| - Definition
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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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
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| - Definition
The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.
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| - Definition
Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits.
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| - Definition
For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.
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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.
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| - Definition
Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.
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| - Definition
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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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.
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| - Definition
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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| - Definition
Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.
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| - Definition
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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| - Definition
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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| - Definition
Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
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| - Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.
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| - Definition
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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| - Definition
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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| - Definition
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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