| **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: 201220112010Income Tax Expense (Benefit) for the Year Ended December 31:  Currently Payable:  Federal$(23)$399$(1,780)State  Deferred:  Federal15,8908,256(1,810)State  Total Income Tax Expense (Benefit)$15,867$8,655$(3,590)Reconciliation of Federal Statutory to Actual Tax Expense (Benefit):   Federal Statutory Income Tax at 35%$21,347$11,867$1,162Tax-exempt Interest Income(3,716)(3,714)(3,733)Non-deductible Interest Expense649421Stock Compensation7669150Earnings on Life Insurance(1,187)(899)(725)Tax Credits(73)(99)(116)Other(580)782(749)Actual Tax Expense (Benefit)$15,867$8,655$(3,590) Tax expense applicable to security gains and losses, including unrealized losses relating to other-than-temporary impairment charges, for the years ended December 31, 2012, 2011 and 2010, was $836,000, $714,000 and $652,000, respectively.The Corporation or one of its subsidiaries files income tax returns in the U.S. federal jurisdiction and various states and foreign 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 2009.The tax effects of temporary differences related to deferred taxes shown on the balance sheets were: 20122011Deferred Tax Asset at December 31:  Assets:  Differences in Accounting for Loan Losses$28,788$29,690Differences in Accounting for Loan Fees941805Differences in Accounting for Loans and Securities477 Deferred Compensation7,1817,612Difference in Accounting for Pensions and Other Employee Benefits1,9533,750Federal & State Income Tax Loss Carryforward and Credits9,35612,416Other9,3568,796Total Assets58,05263,069Liabilities:  Differences in Depreciation Methods6,0505,859Differences in Accounting for Loans and Securities42State Income Tax354354Net Unrealized Gain on Securities Available for Sale7,8798,118Gain on FDIC Modified Whole Bank Transaction2,737Other1,0511,137Total Liabilities18,07115,510Net Deferred Tax Asset Before Valuation Allowance39,98147,559Valuation allowance: Beginning Balance(15,701)(13,258)Decrease/(Increase) During the Year1,842(2,443)Ending Balance(13,859)(15,701)Net Deferred Tax Asset$26,122$31,858 The decrease in the Corporation’s net deferred tax asset was primarily driven by significant decreases in the timing differences associated with the deductibility of the provision for loan losses, pensions and other employee benefits, the utilization of federal tax credit carryforwards, and the increase in the deferred tax liability associated with the gain on the FDIC modified whole bank transaction.The Corporation has recorded a valuation allowance of $13,859,000 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, 2012, the Corporation had approximately $110,065,000 of state tax loss carryforward available to offset future franchise tax.  This state loss carryforward has a full valuation allowance. |

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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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