| **Disclosures About Fair Value of Assets and Liabilities (Tables)**                                                                                                                    | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Uncategorized [Abstract]**                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Fair Value Measurements of Assets and Liabilities Recognized in Consolidated Condensed Balance Sheets Measured at Fair Value                                                           | The following table presents the fair value measurements of assets and liabilities recognized in the Consolidated Condensed Balance Sheets measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall at March 31, 2013, and December 31, 2012.   Fair Value Measurements Using:March 31, 2013Fair ValueQuoted Prices in Active Markets for Identical Assets(Level 1)Significant OtherObservable Inputs(Level 2)SignificantUnobservableInputs(Level 3)Available for sale securities:    U.S. Government-sponsored agency securities$4,387 $4,387 State and municipal159,872 142,565$17,307U.S. Government-sponsored mortgage-backed securities366,535 366,535 Corporate obligations367  367Equity securities1,706 1,7024Interest rate swap asset5,155 5,155 Interest rate cap233 233 Interest rate swap liability8,307 8,307     Fair Value Measurements Using:December 31, 2012Fair ValueQuoted Prices inActive Markets forIdentical Assets(Level 1)Significant Other Observable Inputs(Level 2)SignificantUnobservableInputs(Level 3)Available for sale securities:    U.S. Government-sponsored agency securities$4,640 $4,640 State and municipal158,194 140,094$18,100U.S. Government-sponsored mortgage-backed securities348,579 348,579 Corporate obligations224  224Equity securities1,706 1,7024Interest rate swap asset6,103 6,103Interest rate cap197 197Interest rate swap liability9,766 9,766                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements Recognized in Consolidated Condensed Balance Sheets using Significant Unobservable Level 3 Inputs | The following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the Consolidated Condensed Balance Sheets using significant unobservable (Level 3) inputs for the three months ended March 31, 2013, and 2012.  Three Months Ended March 31, 2013 Availablefor SaleSecuritiesInterestRate SwapAssetInterestRateCapInterest Rate SwapLiabilityBalance at beginning of the period$18,328Total realized and unrealized gains and losses: Included in net income (loss)Included in other comprehensive income(176)Purchases, issuances and settlementsTransfers in/(out) of Level 3Principal payments/additions(474)Ending balance at March 31, 2013$17,678  Three Months Ended March 31, 2012 Availablefor SaleSecuritiesInterestRate SwapAssetInterestRateCapInterestRate SwapLiabilityBalance at beginning of the period$20,838$5,241$424$(7,797)Total realized and unrealized gains and losses:    Included in net income (loss)(860)863Included in other comprehensive income(523)481(15)Purchases, issuances and settlementsTransfers in/(out) of Level 3(4,862)(409)6,934Principal payments(437)  Ending balance at  March 31, 2012$19,878                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Transfer Between Levels 1, 2 and 3 and Reasons For Transfers                                                                                                                           |  Three Months Ended March 31, 2012  Quoted Prices inActive Marketsfor IdenticalAssets (Level 1)SignificantOtherObservableInputs(Level 2)Significant UnobservableInputs (Level 3)Reason for TransferTransfers to/(from) Level:    Interest rate swap asset $4,862$(4,862)The interest rate swap and cap instruments were transferred from Level 3 to Level 2 as of March 31, 2012 due to the availability of additional valuation information. These instruments are valued using widely accepted valuation techniques including discounted cash flow analysis using observable inputs such as contractual terms and LIBOR-based rate curves.Interest rate cap 409(409)Interest rate swap liability 6,934(6,934) $12,205$(12,205)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Description of Valuation Methodologies Used for Instruments Measured at Fair Value on a Non-Recurring Basis and Recognized in Consolidated Condensed Balance Sheets                    | The following table presents the fair value measurement of assets and liabilities measured at fair value on a nonrecurring basis and the level within the fair value hierarchy in which the fair value measurements fall at March 31, 2013, and December 31, 2012.   Fair Value Measurements UsingMarch 31, 2013Fair ValueQuoted Prices inActive Markets forIdentical Assets(Level 1)Significant OtherObservableInputs(Level 2)Significant UnobservableInputs(Level 3)Impaired loans (collateral dependent)$11,096  $11,096Other real estate owned$4,411  $4,411    Fair Value Measurements UsingDecember 31, 2012Fair ValueQuoted Prices inActive Markets forIdentical Assets(Level 1)Significant OtherObservable Inputs(Level 2)Significant UnobservableInputs(Level 3)Impaired loans (collateral dependent)$17,703  $17,703Other real estate owned$7,684  $7,684                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill                                                                             | The following table presents quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill, at March 31, 2013.  Fair ValueValuation TechniqueUnobservable InputsRangeState and municipal securities$17,307Discounted cash flowMaturity/Call date1 month to 11 yrs   Blend of US Muni BQ curveA- to BBB-   Discount rate1% - 4%Corporate obligations/Equity securities$371Discounted cash flowRisk free rate3 month LIBOR   plus Premium for illiquidityplus 200bpsImpaired loans (collateral dependent)$11,096Collateral basedDiscount to reflect current market0% - 50%  measurementsconditions and ultimate collectability Other real estate owned$4,411AppraisalsDiscount to reflect current market0% - 20%   conditions                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Estimated Fair Values of Financial Instruments                                                                                                                                         | The following table presents estimated fair values of the Corporation’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall at March 31, 2013, and December 31, 2012.March 31, 2013(unaudited) CarryingAmountQuoted Prices in Active Marketsfor IdenticalAssetsSignificantOtherObservableInputsSignificant UnobservableInputs (Level 1)(Level 2)(Level 3)Assets:    Cash and due from banks$51,592$51,592  Interest-bearing time deposits60,40760,407  Investment securities available for sale532,867 $515,189$17,678Investment securities held to maturity336,696 344,9486,491Mortgage loans held for sale26,555 26,555 Loans2,811,005  2,824,164Federal Reserve Bank and Federal Home Loan Bank stock32,777 32,777 Interest rate swap asset5,388 5,388 Interest receivable15,346 15,346 Liabilities:    Deposits$3,310,808$2,481,769$825,841 Borrowings:    Federal funds purchased  Securities sold under repurchase agreements161,813 162,234 Federal Home Loan Bank advances93,169 96,211 Subordinated debentures and term loans111,778 62,596 Interest rate swap liability8,307 8,307 Interest payable1,348 1,348 December 31, 2012 CarryingAmountQuoted Prices in Active Marketsfor IdenticalAssetsSignificantOtherObservableInputsSignificant UnobservableInputs (Level 1)(Level 2)(Level 3)Assets:    Cash and due from banks$101,460$101,460  Interest-bearing time deposits38,44338,443  Investment securities available for sale513,343 $495,015$18,328Investment securities held to maturity361,020 366,59011,584Mortgage loans held for sale22,300 22,300 Loans2,832,843  2,852,614Federal Reserve Bank and Federal Home Loan Bank stock32,785 32,785 Interest rate swap asset6,300 6,300Interest receivable16,367 16,367 Liabilities:    Deposits$3,346,383$2,478,706$865,793 Borrowings:    Federal funds purchased18,86218,862Securities sold under repurchase agreements141,828 142,318 Federal Home Loan Bank advances94,238 97,357 Subordinated debentures and term loans112,161 62,133 Interest rate swap liability9,766 9,766Interest payable1,841 1,841  |

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| - Definition
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation
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| - Definition
Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.
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| - Definition
Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).
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| - Definition
Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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