| **Income Tax (Tables)**              | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Income Tax Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Income tax                           | The reconciliation between the statutory and actual income tax expense (benefit) is summarized in the following table for the years indicated: 201320122011Income Tax Expense for the Year Ended December 31:  Currently Payable:  Federal$738$(23)$399State Deferred: Federal13,93915,8908,256State Total Income Tax Expense$14,677$15,867$8,655Reconciliation of Federal Statutory to Actual Tax Expense:   Federal Statutory Income Tax at 35%$20,722$21,347$11,867Tax-exempt Interest Income(3,923)(3,716)(3,714)Non-deductible Interest Expense649Stock Compensation507669Earnings on Life Insurance(905)(1,187)(899)Tax Credits(857)(73)(99)Other(410)(580)782Actual Tax Expense$14,677$15,867$8,655                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Deferred Tax Assets and Liabilities  | The tax effects of temporary differences related to deferred taxes shown on the balance sheets were: 20132012Deferred Tax Asset at December 31:  Assets:  Differences in Accounting for Loan Losses$28,064$28,788Differences in Accounting for Loan Fees736941Differences in Accounting for Loans and Securities13,579477Deferred Compensation5,4797,181Difference in Accounting for Pensions and Other Employee Benefits1,953Federal & State Income Tax Loss Carryforward and Credits24,9819,356Net Unrealized Loss on Securities Available for Sale151Other12,8289,356Total Assets85,81858,052Liabilities:  Differences in Depreciation Methods8,0086,050Difference in Accounting for Pensions and Other Employee Benefits1,096State Income Tax354354Net Unrealized Gain on Securities Available for Sale7,879Gain on FDIC Modified Whole Bank Transaction2,1472,737Other1,2571,051Total Liabilities12,86218,071Net Deferred Tax Asset Before Valuation Allowance72,95639,981Valuation allowance: Beginning Balance(13,859)(15,701)Decrease/(Increase) During the Year(3,312)1,842Ending Balance(17,171)(13,859)Net Deferred Tax Asset$55,785$26,122 |

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| - Definition
Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319
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| - Definition
Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319
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