| **Loans and Allowance (Tables)**                                          | 6 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: June 30, 2013December 31, 2012Commercial and industrial loans$657,764$622,579Agricultural production financing and other loans to farmers105,175112,527Real estate loans:  Construction101,90998,639Commercial and farmland1,272,7611,266,682Residential460,108473,537Home Equity203,788203,406Individuals' loans for household and other personal expenditures79,25875,748Lease financing receivables, net of unearned income1,8282,590Other loans37,48946,501 Loans2,920,0802,902,209Allowance for loan losses(68,202)(69,366)Net Loans$2,851,878$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 six months ended June 30, 2013, and June 30, 2012:  Three Months Ended June 30, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, April 1$25,371$24,978$2,689$15,479$20$68,537Provision for losses1,917(673)225497311,997Recoveries on loans6831,3891073472,526Loans charged off(1,408)(2,089)(136)(1,210)(15)(4,858)Balances, June 30, 2013$26,563$23,605$2,885$15,113$36$68,202 Six Months Ended June 30, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$25,913$26,703$2,593$14,157$69,366Provision for losses2,275(1,428)2982,903$514,099Recoveries on loans2,5562,7653166356,272Loans charged off(4,181)(4,435)(322)(2,582)(15)(11,535)Balances, June 30, 2013$26,563$23,605$2,885$15,113$36$68,202 Three Months Ended June 30, 2012 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, April 1$15,574$37,907$2,805$14,083$70,369Provision for losses4,325(750)(177)1,1474,545Recoveries on loans5191,6361684812,804Loans charged off(2,627)(3,660)(365)(923)(7,575)Balances, June 30, 2012$17,791$35,133$2,431$14,788$70,143 Six Months Ended June 30, 2012 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$17,731$37,919$2,902$12,343$3$70,898Provision for losses4,9021,028(161)3,655(4)9,420Recoveries on loans6671,86437679413,702Loans charged off(5,509)(5,678)(686)(2,004)(13,877)Balances, June 30, 2012$17,791$35,133$2,431$14,788$70,143                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| 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:  June 30, 2013 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$1,353$2,754$5 $4,112Collectively evaluated for impairment24,94120,708$2,88515,084$3663,654Loans Acquired with Deteriorated Credit Quality26914324436Total Allowance for Loan Losses$26,563$23,605$2,885$15,113$36$68,202Loan Balances:      Individually evaluated for impairment$10,114$36,690 $6,269 $53,073Collectively evaluated for impairment789,3541,328,427$79,258656,900$1,8282,855,767Loans Acquired with Deteriorated Credit Quality9609,55372711,240Loans$800,428$1,374,670$79,258$663,896$1,828$2,920,080   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: June 30, 2013December 31, 2012Commercial and industrial loans$8,543$12,195Agriculture Production financing and other loans to farmers33Real Estate Loans:  Construction2,4924,814Commercial and farmland15,35222,612Residential11,14811,476Home Equity1,2341,997Lease financing receivables, net of unearned income301Other Loans1694Total$38,971$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:       June 30, 2013 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:  Commercial and industrial loans$17,836$5,556Agriculture production financing and other loans to farmers3433Real Estate Loans:  Construction4,5403,053Commercial and farmland44,62032,658Residential8,2285,968Home equity3,412226Other loans14030Total$78,810$47,524Impaired loans with related allowance:   Commercial and industrial loans$7,193$5,306$1,476Real Estate Loans:   Construction96159974Commercial and farmland10,2499,1772,823Residential46523529Other loans321148146Total$19,189$15,465$4,548Total Impaired Loans$97,999$62,989$4,548 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 June 30, 2013Six Months Ended June 30, 2013 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial$5,864$35$6,138$69Agriculture production financing and other loans to farmers3333Real Estate Loans:  Construction3,060193,07038Commercial and farmland32,93238233,192760Residential6,067186,37237Home equity226245Other loans31 32Total$48,213$454$49,082$904Impaired loans with related allowance:    Commercial and industrial$5,669$3$6,138$5Real Estate Loans:  Construction599 599Commercial and farmland9,2279,323Residential238240Other loans$152$156Total$15,885$3$16,456$5Total Impaired Loans$64,098$457$65,538$909 Three Months Ended June 30, 2012Six Months Ended June 30, 2012 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial loans$11,411$39$12,418$64Real Estate Loans:Construction8,040168,58129Commercial and farmland41,08431542,615575Residential5,815156,07226Home equity57035856Individuals' loans for household and other personal expenditures139139Other loans1819Total$67,077$388$70,429$700Impaired loans with related allowance:Commercial and industrial loans$6,111$11$6,136$21Real Estate Loans:Construction1,9311,936Commercial and farmland8,369458,50589Residential2,012191,99338Total$18,423$75$18,570$148Total Impaired Loans$85,500$463$88,999$848 |
| 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.  June 30, 2013 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$606,312$24,198$25,352$1,902  $657,764Agriculture production financing and other loans to farmers104,92821433   105,175Real Estate Loans:       Construction87,3847,8806,253  $392101,909Commercial and farmland1,164,32544,63963,212350 2351,272,761Residential140,8131,46814,258140$296,3997,030460,108Home equity10,034663866 191,0231,202203,788Individuals' loans for household and other personal expenditures    79,25879,258Lease financing receivables, net of unearned income1,695 133 1,828Other loans37,3119169   37,489Loans$2,152,802$79,071$110,276$2,392$566,680$8,859$2,920,080  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 June 30, 2013, and December 31, 2012: June 30, 2013 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$648,160$720$341$8,543$9,604$657,764Agriculture production financing and other loans to farmers105,1423333105,175Real Estate Loans:       Construction99,39819 2,4922,511101,909Commercial and farmland1,252,5544,42443115,35220,2071,272,761Residential442,9183,8281,335$87911,14817,190460,108Home equity201,0417555651931,2342,747203,788Individuals' loans for household and other personal expenditures78,6525327460679,258Lease financing receivables, net of unearned income1,828 1,828Other loans37,320   16916937,489Loans$2,867,013$10,278$2,746$1,072$38,971$53,067$2,920,080  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 June 30, 2013Six Months Ended June 30, 2013Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$36$361$133$1334Real Estate Loans:      Commercial and farmland4,4743,55024,9853,9814Residential43242054674576Individuals' loans for household and other personal expenditures4445244452Total$4,986$4,05110$5,629$4,61616  Three Months Ended June 30, 2012Six Months Ended June 30, 2012Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$166$1662$405$4054Real Estate Loans:      Construction49135014913501Commercial and farmland73073542,5082,3696Residential1,7331,598111,9571,82215Total$3,120$2,84918$5,361$4,94626                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 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 June 30, 2013TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$36$36Real Estate Loans:    Commercial and farmland $3,5493,549Residential $100319419Individuals' loans for household and other personal expenditures 4545Total$36$100$3,913$4,049Six Months Ended June 30, 2013TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$60$66$126Real Estate Loans:    Commercial and farmland3,9353,935Residential$100355455Individuals' loans for household and other personal expenditures 4545Total$60$100$4,401$4,561 Three Months Ended June 30, 2012TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$31$31Real Estate Loans:    Construction 346346Commercial and farmland$82599681Residential531$2587201,509Total$613$258$1,696$2,567 Six Months Ended June 30, 2012TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$238$31$269Real Estate Loans:    Construction 346346Commercial and farmland1,7175992,316Residential531$2589441,733Total$2,486$258$1,920$4,664                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 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 June 30, 2013, and June 30, 2012, that subsequently defaulted during the period indicated: Three Months Ended June 30, 2013Six Months Ended June 30, 2013Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceCommercial and Industrial loans1$31$3Real Estate Loans:    Commercial and farmland1223Total1$32$226  Three Months Ended June 30, 2012Six Months Ended June 30, 2012Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceCommercial and Industrial loans1$46Real Estate Loans:    Commercial and farmland2$44531,203Residential52,28352,283Total7$2,7289$3,532                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |

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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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