| **Loans and Allowance (Tables)**                                | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Receivables [Abstract]**                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Composition of Loan Portfolio by Loan Class                     | The following table shows the composition of the Corporation’s loan portfolio by loan class for the years indicated:December 31, 2013December 31, 2012  Commercial and industrial loans$761,705$622,579Agricultural production financing and other loans to farmers114,348112,527Real estate loans:Construction177,08298,639Commercial and farmland1,611,8091,266,682Residential616,385473,537Home Equity255,223203,406Individuals' loans for household and other personal expenditures69,78375,748Lease financing receivables, net of unearned income1,5452,590Other loans24,52946,501Loans3,632,4092,902,209Allowance for loan losses(67,870)(69,366)Net Loans$3,564,539$2,832,843                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Changes in Allowance for Loan Losses                            | The following table summarizes changes in the allowance for loan losses by loan segment for the twelve months ended December 31, 2013, December 31, 2012 and December 31, 2011:  Twelve Months Ended December 31, 2013 CommercialCommercial Real EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$25,913$26,703$2,593$14,157$69,366Provision for losses2,794340(11)3,514$116,648Recoveries on loans4,5863,5525561,29249,990Loans charged off(6,117)(7,493)(623)(3,886)(15)(18,134)Balances, December 31, 2013$27,176$23,102$2,515$15,077$67,870  Twelve Months Ended December 31, 2012 CommercialCommercial Real EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$17,731$37,919$2,902$12,343$3$70,898Provision for losses14,749(2,546)1266,1762918,534Recoveries on loans1,7443,6526951,11327,206Loans charged off(8,311)(12,322)(1,130)(5,475)(34)(27,272)Balances, December 31, 2012$25,913$26,703$2,593$14,157$69,366  Twelve Months Ended December 31, 2011 CommercialCommercial Real EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$32,508$36,341$3,622$10,408$98$82,977Provision for losses(13,787)28,574(221)8,166(102)22,630Recoveries on loans8,8282,8119421,176713,764Loans charged off(9,818)(29,807)(1,441)(7,407)(48,473)Balances, December 31, 2011$17,731$37,919$2,902$12,343$3$70,898                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Allowance for Credit Losses and Loan Portfolio by Loan Segment  | The following tables show the Corporation’s allowance for credit losses and loan portfolio by loan segment for the years indicated: December 31, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$585$763$6$1,354Collectively evaluated for impairment26,49322,208$2,51515,07166,287Loans Acquired with Deteriorated Credit Quality98131229Total Allowance for Loan Losses$27,176$23,102$2,515$15,077$67,870Loan Balances:      Individually evaluated for impairment$10,240$29,007$2,820$42,067Collectively evaluated for impairment882,7941,690,285$69,783867,094$1,5453,511,501Loans Acquired with Deteriorated Credit Quality7,54869,5991,69478,841Loans$900,582$1,788,891$69,783$871,608$1,545$3,632,409  December 31, 2012CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$1,628$2,565$50$4,243Collectively evaluated for impairment24,28524,138$2,59314,10765,123Loans Acquired with Deteriorated Credit QualityTotal Allowance for Loan Losses$25,913$26,703$2,593$14,157$69,366Loan Balances:      Individually evaluated for impairment$14,190$45,394$8,515$68,099Collectively evaluated for impairment765,7071,309,912$75,748667,401$2,5902,821,358Loans Acquired with Deteriorated Credit Quality1,71010,0151,02712,752Loans$781,607$1,365,321$75,748$676,943$2,590$2,902,209                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Summary of Non-Accrual Loans by Loan class                      | The following table summarizes the Corporation’s non-accrual loans by loan class for the years indicated:December 31, 2013December 31, 2012Commercial and industrial loans$9,283$12,195Agriculture Production financing and other loans to farmers30  Real Estate Loans: Construction4,9784,814Commercial and farmland28,09522,612Residential12,06811,476Home Equity1,6671,997Individuals' loans for household and other personal expenditures117Lease financing receivables, net of unearned income301Other Loans1644Total$56,402$53,399                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Composition of Impaired Loans by Loan Class                     | The following tables show the composition of only the Corporation’s commercial impaired loans by loan class for the years indicated: December 31, 2013 Unpaid PrincipalBalanceRecordedInvestmentRelatedAllowanceAverage Recorded InvestmentInterest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial loans$35,066$16,371 $19,209$192Agriculture production financing and other loans to farmers3230 32 Real Estate Loans:     Construction16,10910,625 11,621117Commercial and farmland128,07383,033 84,0571,663Residential6,7463,910 4,23675Home equity3,299112 225Other loans454172 1811Total$189,779$114,253 $119,561$2,048Impaired loans with related allowance:     Commercial and industrial loans$1,390$1,216$683$1,240$9Real Estate Loans:     Construction Commercial and farmland4,6574,2158944,2919Residential7471676Total$6,121$5,502$1,583$5,607$18Total Impaired Loans$195,900$119,755$1,583$125,168$2,066 December 31, 2012 Unpaid PrincipalBalanceRecordedInvestmentRelatedAllowanceAverage Recorded InvestmentInterest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial loans$28,532$11,730 $15,089$124Real Estate Loans:     Construction9,7875,164 6,47166Commercial and farmland58,17343,204 46,7881,211Residential8,8206,215 7,12983Home equity4,1991,006 1,02213Other loans8314 181Total$109,594$67,333 $76,517$1,498Impaired loans with related allowance:     Commercial and industrial loans$4,415$4,155$1,628$4,225$33Real Estate Loans:     Construction1,2021,0581051,175 Commercial and farmland5,5795,1822,4605,23995Residential1,7221,451501,45875Total$12,918$11,846$4,243$12,097$203Total Impaired Loans$122,512$79,179$4,243$88,614$1,701  December 31, 2011 Unpaid PrincipalBalanceRecordedInvestmentRelatedAllowanceAverage Recorded InvestmentInterest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial loans$23,364$10,116 $13,399$615Real Estate Loans:     Construction14,3017,701 8,836 Commercial and farmland49,24234,571 39,032591Residential7,4916,185 6,53920Home equity4,4251,241 1,50015Other loans9921 24Total$98,922$59,835 $69,330$1,241Impaired loans with related allowance:     Commercial and industrial loans$8,691$8,104$4,142$8,196$174Real Estate Loans:     Construction961961321961 Commercial and farmland12,1158,7482,18310,028140Residential1,8881,5753911,6877Other loans579552559590 Total$24,234$19,940$7,596$21,462$321Total Impaired Loans$123,156$79,775$7,596$90,792$1,562 |
| Credit Quality of Loan Portfolio by Loan Class                  | The following tables summarize the credit quality of the Corporation’s loan portfolio, by loan class for the years indicated.  Consumer non-performing loans include accruing consumer loans 90 plus days delinquent and consumer non-accrual loans.  The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified date.  Loans that evidenced deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected are included in the applicable categories below. December 31, 2013 Commercial PassCommercial Special MentionCommercial SubstandardCommercial DoubtfulCommercial LossConsumer PerformingConsumerNon PerformingTotalCommercial and Industrial loans$708,835$11,332$41,013$525   $761,705Agriculture production financing and other loans to farmers114,31830   114,348Real Estate Loans:      Construction162,9761,13212,029 $945177,082Commercial and farmland1,473,71457,67680,184 2351,611,809Residential143,6572,23211,494136 $448,49410,372616,385Home Equity6,194351,184 246,1011,709255,223Individuals' loans for household and other personal expenditures     69,66611769,783Lease financing receivables, net of unearned income1,420125 1,545Other Loans24,334195 24,529Loans$2,635,448$72,407$146,254$661                        $764,261$13,378$3,632,409 December 31, 2012 Commercial PassCommercial Special MentionCommercial SubstandardCommercial DoubtfulCommercial LossConsumer PerformingConsumerNon PerformingTotalCommercial and Industrial loans$559,852$23,678$34,460$4,589   $622,579Agriculture production financing and other loans to farmers112,20922494   112,527Real Estate Loans:      Construction85,7281,38411,356 $17198,639Commercial and farmland1,148,56138,19979,078553 2911,266,682Residential145,4025,43713,880922 $301,6146,282473,537Home Equity9,0928931,657 189,7212,043203,406Individuals' loans for household and other personal expenditures     75,74875,748Lease financing receivables, net of unearned income 2,2893012,590Other Loans46,47328 46,501Loans$2,107,317$69,815$140,553$6,064                        $569,372$9,088$2,902,209                                                                                                                                                                                                                                                          |
| Past Due Aging of Loan Portfolio by Loan Class                  | The following tables show a past due aging of the Corporation’s loan portfolio, by loan class, for the years indicated:December 31, 2013 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$749,020$2,628$774$9,283$12,685$761,705Agriculture production financing and other loans to farmers114,305133043114,348Real Estate Loans:      Construction171,0461,058  4,9786,036177,082Commercial and farmland1,573,4033,8075,801$70328,09538,4061,611,809Residential595,1927,1561,47549412,06821,193616,385Home equity251,1881,6525631531,6674,035255,223Individuals' loans for household and other personal expenditures69,06155055 11772269,783Lease financing receivables, net of unearned income1,545   1,545Other loans24,365   16416424,529Loans$3,549,125$16,864$8,668$1,350$56,402$83,284$3,632,409  December 31, 2012 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$607,442$2,628$144$170$12,195$15,137$622,579Agriculture production financing and other loans to farmers112,527112,527Real Estate Loans:       Construction93,4263994,8145,21398,639Commercial and farmland1,238,9073,2761,8226522,61227,7751,266,682Residential453,7435,7341,3381,24611,47619,794473,537Home equity199,0631,4673235561,9974,343203,406Individuals' loans for household and other personal expenditures74,9197993082975,748Lease financing receivables, net of unearned income2,289   3013012,590Other loans46,4974446,501Loans$2,828,813$14,303$3,657$2,037$53,399$73,396$2,902,209                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Summary of Troubled Debt Restructurings                         | The following tables summarize troubled debt restructurings that occurred during the periods ended December 31, 2013 and December 31, 2012: December 31, 2013Pre-ModificationRecorded BalancePost-ModificationRecorded BalanceNumberof LoansCommercial and industrial loans$295$3165Real Estate Loans:   Commercial and farmland6,5065,49211Residential80980412Individuals' loans for household and other personal expenditures1431454Total$7,753$6,75732   December 31, 2012Pre-ModificationRecorded BalancePost-ModificationRecorded BalanceNumberof LoansCommercial and industrial loans$1,562$1,5479Real Estate Loans:  Construction7946532Commercial and farmland10,36610,15414Residential2,3022,17220Individuals' loans for household and other personal expenditures1701975Total $15,194$14,72350                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Schedule of Troubled Debt Restructurings by Modification Type   | The following tables show the recorded investment of troubled debt restructurings, by modification type,  that occurred during the years indicated: December 31, 2013TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$207$60$267Real Estate Loans:    Commercial and farmland1,3881,9853,373Residential167$237351755Individuals' loans for household and other personal expenditures613825124Total$1,823$275$2,421$4,519 December 31, 2012TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$259$1,029$1,288Real Estate Loans:    Construction625625Commercial and farmland6,668$9033817,952Residential5253809951,900Individuals' loans for household and other personal expenditures7183190Total$7,452$1,290$3,213$11,955                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Summary of Troubled Debt Restructurings and Subsequent Defaults | The following tables summarize troubled debt restructures that occurred during the twelve months ended December 31, 2013 and December 31, 2012, that subsequently defaulted during those periods:Twelve Months Ended December 31, 2013 Number of LoansRecorded BalanceCommercial and industrial loans3$173Real Estate Loans:Commercial and farmland21,034Total5$1,207Twelve Months Ended December 31, 2012 Number of LoansRecorded BalanceCommercial and industrial loans1$23Real Estate Loans:Commercial and farmland2212Residential4385Total7$620                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |

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Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.
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Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.
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Tabular disclosure of impaired financing receivables.
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Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.
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Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
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Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing.
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Tabular disclosure of financing receivables and troubled debt restructurings.
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