| **Income Tax**                       | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Income Tax Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Income Tax                           | INCOME TAXThe reconciliation between the statutory and actual income tax expense (benefit) is summarized in the following table for the years indicated: 201420132012Income Tax Expense for the Year Ended December 31:  Currently Payable:  Federal$(1,661)$738$(23)State Deferred: Federal22,54113,93915,890State510 Total Income Tax Expense$21,390$14,677$15,867Reconciliation of Federal Statutory to Actual Tax Expense:   Federal Statutory Income Tax at 35%$28,543$20,722$21,347Tax-exempt Interest Income(5,148)(3,923)(3,716)Stock Compensation365076Earnings on Life Insurance(1,271)(905)(1,187)Tax Credits(911)(857)(73)Other141(410)(580)Actual Tax Expense$21,390$14,677$15,867 Tax expense applicable to security gains and losses, including unrealized losses relating to other-than-temporary impairment charges, for the years ended December 31, 2014, 2013 and 2012, was $760,000, $157,000 and $759,000, respectively.The Corporation or one of its subsidiaries files income tax returns in the U.S. federal jurisdiction and various state jurisdictions.  With a few exceptions, the Corporation is no longer subject to U.S. federal, state and local or non-U.S. income tax examinations by tax authorities for years before 2011.The tax effects of temporary differences related to deferred taxes shown on the balance sheets were: 20142013Deferred Tax Asset at December 31:  Assets:  Differences in Accounting for Loan Losses$26,665$28,064Differences in Accounting for Loan Fees747736Differences in Accounting for Loans and Securities9,91013,579Deferred Compensation5,2345,479Difference in Accounting for Pensions and Other Employee Benefits1,084Federal & State Income Tax Loss Carryforward and Credits23,97724,981Net Unrealized Loss on Securities Available for Sale151Other8,53512,828Total Assets76,15285,818Liabilities:  Differences in Depreciation Methods8,2208,008Difference in Accounting for Pensions and Other Employee Benefits1,096State Income Tax591354Net Unrealized Gain on Securities Available for Sale7,591Gain on FDIC Modified Whole Bank Transaction1,6942,147Other1,0961,257Total Liabilities19,19212,862Net Deferred Tax Asset Before Valuation Allowance56,96072,956Valuation allowance: Beginning Balance(17,171)(13,859)Decrease/(Increase) During the Year(397)(3,312)Ending Balance(17,568)(17,171)Net Deferred Tax Asset$39,392$55,785The $16,393,000 decrease in the Corporation’s net deferred tax asset was due to a combination of a decrease in deferred tax assets and an increase in deferred tax liabilities.  The largest deferred tax asset decreases were associated with accounting for loans, other than temporary impairment on securities, and other real estate owned in the amounts of $3,669,000, $3,261,000 and $1,988,000, respectively.  Partially offsetting these deferred tax asset decreases was the $2,180,000 net change in the shift of the accounting for pensions and other employee benefits from a deferred tax liability to a deferred tax asset.  Finally, the largest deferred tax liability increase of $7,742,000 resulted from the accounting for unrealized gains on available for sale securities.The Corporation has recorded a valuation allowance of $17,568,000 related to deferred state taxes as it does not anticipate having future state taxable income sufficient to fully utilize the deferred state tax asset.  This is primarily due to the Corporation’s current tax structure as discussed in the “INCOME TAXES” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations included as item 7 of this Annual Report on Form 10-K.As of December 31, 2014, the Corporation had approximately $143,467,000 of state tax loss carryforward available to offset future state taxes.  This state loss carryforward has a valuation allowance of approximately $142,358,000.The Corporation has approximately $13,393,000 of additional paid-in capital that is considered restricted resulting from the CFS acquisition.  CFS qualified as a bank under provisions of the Internal Revenue Code which permitted it to deduct from taxable income an allowance for bad debts which differed from the provision for losses charged to income.  No provision for income taxes had been provided.  If in the future this portion of additional paid-in capital is distributed, or the Corporation no longer qualifies as a bank for income tax purposes, income taxes may be imposed at the then applicable tax rates.   The unrecorded deferred tax liability at December 31, 2014, would have been approximately $4,688,000. |

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| - Definition
The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.
+ References
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