| **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: 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                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Deferred Tax Assets and Liabilities  | 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$55,785 |

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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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