| **Loans and Allowance (Tables)**                                          | 9 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 periods indicated: September 30, 2013December 31, 2012Commercial and industrial loans$652,356$622,579Agricultural production financing and other loans to farmers98,489112,527Real estate loans:  Construction149,87598,639Commercial and farmland1,264,1801,266,682Residential452,277473,537Home Equity206,816203,406Individuals' loans for household and other personal expenditures70,38075,748Lease financing receivables, net of unearned income1,8152,590Other loans29,26946,501 Loans2,925,4572,902,209Allowance for loan losses(66,224)(69,366)Net Loans$2,859,233$2,832,843                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Changes in Allowance for Loan Losses                                      | The following tables summarize changes in the allowance for loan losses by loan segment for the three and nine months ended September 30, 2013, and September 30, 2012:  Three Months Ended September 30, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, July 1$26,563$23,605$2,885$15,113$36$68,202Provision for losses(346)1,560(31)333171,533Recoveries on loans1,49425811031132,176Loans charged off(1,680)(2,795)(161)(1,051)(5,687)Balances, September 30, 2013$26,031$22,628$2,803$14,706$56$66,224 Nine Months Ended September 30, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$25,913$26,703$2,593$14,157$69,366Provision for losses1,9291322673,236$685,632Recoveries on loans4,0503,02342694638,448Loans charged off(5,861)(7,230)(483)(3,633)(15)(17,222)Balances, September 30, 2013$26,031$22,628$2,803$14,706$56$66,224 Three Months Ended September 30, 2012 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, July 1$17,791$35,133$2,431$14,788$70,143Provision for losses5,431(879)147(90)4,609Recoveries on loans5261,5982191742,517Loans charged off(1,424)(4,439)(168)(1,745)(7,776)Balances, September 30, 2012$22,324$31,413$2,629$13,127$69,493 Nine Months Ended September 30, 2012 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$17,731$37,919$2,902$12,343$3$70,898Provision for losses10,333149(14)3,565(4)14,029Recoveries on loans1,1933,46259596816,219Loans charged off(6,933)(10,117)(854)(3,749)(21,653)Balances, September 30, 2012$22,324$31,413$2,629$13,127$69,493                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| 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 as of the periods indicated:  September 30, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$285$757$6 $1,048Collectively evaluated for impairment25,63021,560$2,80314,700$5664,749Loans Acquired with Deteriorated Credit Quality116311427Total Allowance for Loan Losses$26,031$22,628$2,803$14,706$56$66,224Loan Balances:      Individually evaluated for impairment$7,946$33,912 $2,839 $44,697Collectively evaluated for impairment771,2991,370,737$70,380655,842$1,8152,870,073Loans Acquired with Deteriorated Credit Quality8699,40641210,687Loans$780,114$1,414,055$70,380$659,093$1,815$2,925,457   December 31, 2012 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$1,628$2,565 $50 $4,243Collectively evaluated for impairment24,28524,138$2,59314,107 65,123Total 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 as of the periods indicated: September 30, 2013December 31, 2012Commercial and industrial loans$6,467$12,195Agriculture Production financing and other loans to farmers31Real Estate Loans:  Construction2,6434,814Commercial and farmland16,18722,612Residential8,37511,476Home Equity1,0931,997Individuals' loans for household and other personal expenditures32Lease financing receivables, net of unearned income301Other Loans1644Total$34,992$53,399                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Composition of Impaired Loans by Loan Class                               | The following tables show the composition of the Corporation’s commercial impaired loans by loan class for the periods indicated:       September 30, 2013 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:  Commercial and industrial loans$21,683$7,758Agriculture production financing and other loans to farmers3331Real Estate Loans:  Construction6,1613,789Commercial and farmland46,83433,085Residential4,6712,569Home equity3,386199Other loans457172Total$83,225$47,603Impaired loans with related allowance:  Commercial and industrial loans$1,119$853$401Real Estate Loans:   ConstructionCommercial and farmland6,5205,7001,068Residential74716Other loansTotal$7,713$6,624$1,475Total Impaired Loans$90,938$54,227$1,475 December 31, 2012 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:   Commercial and industrial loans$28,532$11,730Real Estate Loans:   Construction9,7875,164Commercial and farmland58,17343,204Residential8,8206,215Home equity4,1991,006Other loans8314Total$109,594$67,333Impaired loans with related allowance:   Commercial and industrial loans$4,415$4,155$1,628Real Estate Loans:   Construction1,2021,058105Commercial and farmland5,5795,1822,460Residential1,7221,45150Total$12,918$11,846$4,243Total Impaired Loans$122,512$79,179$4,243 Three Months Ended September 30, 2013Nine Months Ended September 30, 2013 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial$8,352$110$9,553$184Agriculture production financing and other loans to farmers3233Real Estate Loans:  Construction4,115294,26285Commercial and farmland34,29862035,1981,642Residential2,687823,028114Home equity217236Other loans174 1841Total$49,875$841$52,494$2,026Impaired loans with related allowance:    Commercial and industrial$865$889$7Real Estate Loans:  Construction Commercial and farmland5,742$55,8445Residential7478Other loansTotal$6,681$5$6,811$12Total Impaired Loans$56,556$846$59,305$2,038 Three Months Ended September 30, 2012Nine Months Ended September 30, 2012 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial loans$9,994$26$11,615$68Agriculture production financing and other loans to farmers300300Real Estate Loans:Construction6,658177,66547Commercial and farmland31,08125033,459706Residential6,936207,34254Home equity713372710Other loans17181Total$55,699$316$61,126$886Impaired loans with related allowance:Commercial and industrial loans$5,244$11$5,307$32Real Estate Loans:Construction510541Commercial and farmland12,3263212,37195Residential1,485191,48556Total$19,565$62$19,704$183Total Impaired Loans$75,264$378$80,830$1,069 |
| Credit Quality of Loan Portfolio by Loan Class                            | The following tables summarize the credit quality of the Corporation’s loan portfolio, by loan class as of the periods 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.  September 30, 2013 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$603,166$18,481$29,155$1,554  $652,356Agriculture production financing and other loans to farmers98,45831   98,489Real Estate Loans:       Construction142,1692,7524,491  $463149,875Commercial and farmland1,163,57041,95458,309112 2351,264,180Residential139,4811,50410,803140$293,3297,020452,277Home equity6,6331051,126 197,7761,176206,816Individuals' loans for household and other personal expenditures    70,2859570,380Lease financing receivables, net of unearned income1,688 127 1,815Other loans29,0632204   29,269Loans$2,184,228$64,798$104,246$1,806$561,390$8,989$2,925,457  December 31, 2012 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial 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 farmland1,148,56138,19979,0785532911,266,682Residential145,4025,43713,880922$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 table shows a past due aging of the Corporation’s loan portfolio, by loan class as of September 30, 2013, and December 31, 2012: September 30, 2013 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$645,044$845$6,467$7,312$652,356Agriculture production financing and other loans to farmers98,458313198,489Real Estate Loans:       Construction147,157$752,6432,718149,875Commercial and farmland1,246,319843$83116,18717,8611,264,180Residential439,8602,6279984178,37512,417452,277Home equity204,0281,1532602821,0932,788206,816Individuals' loans for household and other personal expenditures69,81937888633256170,380Lease financing receivables, net of unearned income1,815 1,815Other loans29,105   16416429,269Loans$2,881,605$5,846$2,177$837$34,992$43,852$2,925,457  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 farmers112,527 112,527Real Estate Loans:       Construction93,426399  4,8145,21398,639Commercial 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 expenditures74,91979930 82975,748Lease financing receivables, net of unearned income2,289   3013012,590Other loans46,497   4446,501Loans$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 indicated: Three Months Ended September 30, 2013Nine Months Ended September 30, 2013Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$162$1831$294$3155Real Estate Loans:      Commercial and farmland1,4641,46966,4495,45010Residential19019126586498Individuals' loans for household and other personal expenditures44452Total$1,816$1,8439$7,445$6,45925  Three Months Ended September 30, 2012Nine Months Ended September 30, 2012Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$875$1,0483$1,155$1,3276Real Estate Loans:      Construction30330317946532Commercial and farmland87587522,9672,8287Residential23924142,1962,06319Individuals' loans for household and other personal expenditures901174901174Total$2,382$2,58414$7,202$6,98838                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Summary of Troubled Debt Restructurings and Subsequent Defaults           | The following tables show the recorded investment of troubled debt restructurings, by modification type, that occurred during the periods indicated: Three Months Ended September 30, 2013TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$175$175Real Estate Loans:    Commercial and farmland1,3991,399Residential158$34192Total$1,732$34$1,766Nine Months Ended September 30, 2013TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$228$63$291Real Estate Loans:    Commercial and farmland1,3991,9503,349Residential158$94353605Individuals' loans for household and other personal expenditures 2626Total$1,785$94$2,392$4,271 Three Months Ended September 30, 2012TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$1,048$1,048Real Estate Loans:    Construction 299299Commercial and farmland$680195875Residential167167Individuals loans for household and other personal expenditures 7109116Total$687$1,818$2,505 Nine Months Ended September 30, 2012TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$230$1,072$1,302Real Estate Loans:    Construction 639639Commercial and farmland1,693$6803852,758Residential5282521,1001,880Individuals' loans for household and other personal expenditures 7109116Total$2,451$939$3,305$6,695                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Commercial Non-Impaired Loans Included in ASC 450 Loss Migration Analysis | The following tables summarize troubled debt restructures that occurred during the twelve months ended September 30, 2013, and September 30, 2012, that subsequently defaulted during the period indicated and remained in default at period end.  For purposes of this schedule, a loan is considered in default if it is 30 or more days past due. Three Months Ended September 30, 2013Nine Months Ended September 30, 2013Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceCommercial and Industrial loans1$181$18Real Estate Loans:    Commercial and farmland1223Residential21662166Total3$1844$407  Three Months Ended September 30, 2012Nine Months Ended September 30, 2012Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceCommercial and Industrial loans3$1,4153$1,415Real Estate Loans:    Commercial and farmland123123Residential7371112,494Total11$1,80915$3,932                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |

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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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