| **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, 2012December 31, 2011Loans:  Commercial and industrial loans$622,579$532,523Agricultural production financing and other farm loans112,527104,526Real estate loans: Construction98,63981,780Commercial and farmland1,266,6821,194,230Residential473,537481,493Home Equity203,406191,631Individual's loans for household and other personal expenditures75,74884,172Lease financing receivables, net of unearned income2,5903,555Other loans46,50139,505Loans2,902,2092,713,415Allowance for loan losses(69,366)(70,898)Net Loans$2,832,843$2,642,517                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 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, 2012, December 31, 2011 and December 31, 2010:  Twelve Months Ended December 31, 2012 CommercialReal Estate CommercialConsumerResidentialFinanceLeasesTotalAllowance 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 CommercialReal Estate CommercialConsumerResidentialFinanceLeasesTotalAllowance 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  Twelve Months Ended December 31, 2010 CommercialReal Estate CommercialConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$48,770$30,189$2,242$10,751$179$92,131Provision for losses(180)37,5552,8686,267(27)46,483Recoveries on loans6,7501,4209382,82711,935Loans charged off(22,832)(32,823)(2,426)(9,437)(54)(67,572)Balances, December 31, 2010$32,508$36,341$3,622$10,408$98$82,977                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 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, 2012 CommercialCommercialReal 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  December 31, 2011CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$4,701$2,504 $733 $7,938Collectively evaluated for impairment13,03035,415$2,90211,610$362,960Total Allowance for Loan Losses$17,731$37,919$2,902$12,343$3$70,898Loan Balances:      Individually evaluated for impairment$18,793$51,980 $12,546 $83,319Collectively evaluated for impairment657,7611,224,030$84,172660,578$3,5552,630,096Loans$676,554$1,276,010$84,172$673,124$3,555$2,713,415                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 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, 2012December 31, 2011Commercial and Industrial$12,195$12,246Real Estate Loans: Construction4,8148,990Commercial and farmland22,61231,093Residential11,47614,805Home Equity1,9971,896Individuals loans for household and other personal expenditures1Lease financing receivables, net of unearned income301Other Loans4561Total$53,399$69,592                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 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, 2012 Unpaid PrincipalBalanceRecordedInvestmentRelatedAllowanceAverage Recorded InvestmentInterest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial$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$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$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$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  December 31, 2010 Unpaid Principal BalanceRecorded InvestmentRelated AllowanceImpaired loans with no related allowance:           Commercial and industrial$30,006$16,572               other loans to farmers966530          Real Estate Loans:                Construction12,5989,150               Commercial and farm land64,06443,653               Residential7,9095,153               Home equity4,4601,245          Other loans10114                  Total$120,104$76,317  Impaired loans with related allowance:           Commercial and industrial$11,477$11,374$5,250          Real Estate Loans:                Construction9,3537,8242,049               Commercial and farm land17,98417,0765,496               Residential2,7402,691465               Home equity458446178          Other loans476476476                  Total$42,488$39,887$13,914Total Impaired Loans$162,592$116,204$13,914 |
| 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. December 31, 2012 Commercial PassCommercial Special MentionCommercial SubstandardCommercial DoubtfulCommercial LossConsumer PerformingConsumerNon PerformingTotalCommercial and Industrial$559,852$23,678$34,460$4,589   $622,579Agriculture production financing and other farm loans112,20922494   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 December 31, 2011 Commercial PassCommercial Special MentionCommercial SubstandardCommercial DoubtfulCommercial LossConsumer PerformingConsumerNon PerformingTotalCommercial and Industrial$478,885$22,405$28,025$3,208   $532,523Agriculture production financing and other farm loans101,2891,5821,655    104,526Real Estate Loans:       Construction47,6113,67222,376  $7,762$35981,780Commercial and farmland1,033,39754,697103,3301,724 1,035471,194,230Residential139,2379,17516,699500 308,3067,576481,493Home Equity15,9124993,317  170,7761,127191,631Individuals loans for household and other personal expenditures     84,1215184,172Lease financing receivables, net of unearned income     3,555 3,555Other Loans38,9171521552   39,505Loans$1,855,248$92,045$175,423$5,984                        $575,555$9,160$2,713,415                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 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, 2012 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial$607,442$2,628$144$170$12,195$15,137$622,579Agriculture production financing and other farm loans112,527112,527Real 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  December 31, 2011 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial$518,764$1,332$135$46$12,246$13,759$532,523Agriculture production financing and other farm loans104,4646262104,526Real Estate Loans:       Construction69,3053283,126318,99012,47581,780Commercial and farmland1,140,89716,4575,78331,09353,3331,194,230Residential458,9255,4852,08719114,80522,568481,493Home equity187,7881,0965902611,8963,843191,631Individuals loans for household and other personal expenditures82,8371,0752085111,33584,172Lease financing receivables, net of unearned income3,555   3,555Other loans38,94456156139,505Loans$2,605,479$25,835$11,929$580$69,592$107,936$2,713,415                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Summary of Troubled Debt Restructurings                         | The following tables summarize troubled debt restructurings that occurred during the periods ended December 31, 2012 and December 31, 2011: December 31, 2012Pre-ModificationRecorded BalancePost-ModificationRecorded BalanceNumberof LoansCommercial and Industrial$1,562$1,5479Real Estate Loans:   Construction7946532Commercial and farmland10,36610,15414Residential2,3022,17220Individuals loans for household and other personal expenditures1701975Total$15,194$14,72350   December 31, 2011Pre-ModificationRecorded BalancePost-ModificationRecorded BalanceNumberof LoansCommercial and Industrial$4,023$4,03317Real Estate Loans:  Construction7917265Commercial and farmland17,29715,26019Residential6,8927,07652Individuals loans for household and other personal expenditures90949Other Loans12121Total $29,105$27,201103                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 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, 2012TermModificationRateModificationCombinationTotalModificationCommercial and Industrial$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 December 31, 2011TermModificationRateModificationCombinationTotalModificationCommercial and Industrial$3,816$118$3,934Real Estate Loans:    Construction581$12517723Commercial and farmland10,3389542,81014,102Residential5,610991,0226,731Home Equity553489Other Loans1212Total$20,412$1,178$4,001$25,591                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Summary of Troubled Debt Restructurings and Subsequent Defaults | The following tables summarize troubled debt restructures that occurred during the twelve months ended December 31, 2012 and December 31, 2011, that subsequently defaulted during those periods:Twelve Months Ended December 31, 2012 Number of LoansRecorded BalanceCommercial and Industrial1$23Real Estate Loans:Commercial and farmland2212Residential4385Total7$620Twelve Months Ended December 31, 2011 Number of LoansRecorded BalanceCommercial and Industrial3$471Real Estate Loans:Commercial and farmland31,951Residential7557Individuals loans for household and other personal expenditures15Total14$2,984                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |

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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 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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