| **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, 2016December 31, 2015Commercial and industrial loans$1,146,538$1,057,075Agricultural production financing and other loans to farmers93,16997,711Real estate loans:  Construction368,241366,704Commercial and farmland1,941,7391,802,921Residential739,855786,105Home Equity398,837348,613Individuals' loans for household and other personal expenditures76,49774,717Lease financing receivables, net of unearned income380588Other commercial loans208,588159,388             Loans$4,973,844$4,693,822Allowance for loan losses(63,456)(62,453)             Net Loans$4,910,388$4,631,369                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| 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, 2016, and September 30, 2015: Three Months Ended September 30, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, June 30, 2016$26,321$22,280$2,684$10,899$2$62,186Provision for losses7275781154801,900Recoveries on loans1756511013241,251Loans charged off(720)(572)(114)(475)(1,881)Balances, September 30, 2016$26,503$22,937$2,786$11,228$2$63,456 Nine Months Ended September 30, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, December 31, 2015$26,478$22,145$2,689$11,139$2$62,453Provision for losses1,2669921927903,240Recoveries on loans1,1501,8792869094,224Loans charged off(2,391)(2,079)(381)(1,610)(6,461)Balances, September 30, 2016$26,503$22,937$2,786$11,228$2$63,456Three Months Ended September 30, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, June 30, 2015$31,479$15,828$2,927$12,311$5$62,550Provision for losses3,202(2,966)(102)(132)(2)Recoveries on loans2811,510675132,371Loans charged off(1,026)(386)(169)(479)(2,060)Balances, September 30, 2015$33,936$13,986$2,723$12,213$3$62,861 Nine Months Ended September 30, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, December 31, 2014$28,824$19,327$2,658$13,152$3$63,964Provision for losses6,226(6,364)225330417Recoveries on loans1,1682,0692461,3924,875Loans charged off(2,282)(1,046)(406)(2,661)(6,395)Balances, September 30, 2015$33,936$13,986$2,723$12,213$3$62,861                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Allowance for credit losses and loan portfolio by loan segment | The following tables show the Corporation’s allowance for loan losses and loan portfolio by segment as of the periods indicated: September 30, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$555$760$312$1,627Collectively evaluated for impairment25,94822,177$2,78610,916$261,829Loans Acquired with Deteriorated Credit QualityTotal Allowance for Loan Losses$26,503$22,937$2,786$11,228$2$63,456Loan Balances:      Individually evaluated for impairment$5,764$23,904$4,158$33,826Collectively evaluated for impairment1,436,0652,242,862$76,4971,132,385$3804,888,189Loans Acquired with Deteriorated Credit Quality6,46643,2142,14951,829Loans$1,448,295$2,309,980$76,497$1,138,692$380$4,973,844 December 31, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$1,277$243$169$1,689Collectively evaluated for impairment25,20121,753$2,68910,966$260,611Loans Acquired with Deteriorated Credit Quality1494153Total Allowance for Loan Losses$26,478$22,145$2,689$11,139$2$62,453Loan Balances:      Individually evaluated for impairment$7,877$16,670$4,020$28,567Collectively evaluated for impairment1,298,9882,096,089$74,7171,125,316$5884,595,698Loans Acquired with Deteriorated Credit Quality7,30956,8665,38269,557Loans$1,314,174$2,169,625$74,717$1,134,718$588$4,693,822                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| 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, 2016December 31, 2015Commercial and industrial loans$2,381$4,634Agriculture production financing and other loans to farmers1,530827Real estate Loans:  Construction271736Commercial and farmland16,98311,277Residential10,60811,818Home Equity2,2161,952Individuals' loans for household and other personal expenditures116145Total$34,105$31,389                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Composition of impaired loans by loan class                    | The following tables show the composition of the Corporation’s commercial impaired loans by loan class as of the periods indicated:  September 30, 2016 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:  Commercial and industrial loans$18,096$9,996Agriculture production financing and other loans to farmers649611Real estate Loans:  Construction6,4923,545Commercial and farmland82,55161,536Residential8,2524,934Home equity8244Other commercial loans13Total$116,135$80,666Impaired loans with related allowance:  Commercial and industrial loans$779$467$379Agriculture production financing and other loans to farmers1,1861,156175Real estate Loans:   Commercial and farmland2,0701,835760Residential653422Total$4,100$3,492$1,336Total Impaired Loans$120,235$84,158$1,336 December 31, 2015 UnpaidPrincipalBalance RecordedInvestment RelatedAllowanceImpaired loans with no related allowance:     Commercial and industrial loans$22,151 $11,669  Agriculture production financing and other loans to farmers370 361  Real estate Loans:     Construction4,551 2,336  Commercial and farmland95,930 69,024  Residential11,262 7,338  Home equity297 247  Other commercial loans20   Total$134,581 $90,975  Impaired loans with related allowance:     Commercial and industrial loans$3,043 $2,690 $1,247Agriculture production financing and other loans to farmers46646630Real estate Loans:     Commercial and farmland2,144 1,933 392Residential2,300 1,463 173Total$7,953 $6,552 $1,842Total Impaired Loans$142,534 $97,527 $1,842 Three Months Ended September 30, 2016Nine Months Ended September 30, 2016 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial loans$10,025$89$10,436$261Agriculture production financing and other loans to farmers63636443Real estate Loans:  Construction3,526723,572215Commercial and farmland61,90385463,7222,576Residential5,081405,453118Home equity4457Total$81,215$1,058$83,884$3,173Impaired loans with related allowance:    Commercial and industrial loans$469$471Agriculture production financing and other loans to farmers1,16461,2366Real estate Loans:  Commercial and farmland1,8501,894Residential3439Total$3,517$6$3,640$6Total Impaired Loans$84,732$1,064$87,524$3,179 Three Months Ended September 30, 2015Nine Months Ended September 30, 2015 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial loans$11,863$137$12,676$368Agriculture production financing and other loans to farmers675699Real estate Loans:Construction2,855413,407123Commercial and farmland64,18693265,3102,661Residential9,028479,272177Home equity194197Total$88,801$1,157$91,561$3,329Impaired loans with related allowance:Commercial and industrial loans$2,731$10$2,774$29Agriculture production financing and other loans to farmers547547Real estate Loans:Commercial and farmland2,4592,613Residential625626Total$6,362$10$6,560$29Total Impaired Loans$95,163$1,167$98,121$3,358 |
| 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 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.  Loans that evidenced deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected are included in the applicable categories below. September 30, 2016 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$1,075,134$34,937$36,467  $1,146,538Agriculture production financing and other loans to farmers30,49135,07527,603   93,169Real estate Loans:       Construction344,7375,381966$17,081$76368,241Commercial and farmland1,805,51352,86483,362 1,941,739Residential148,2515,5326,573570,8388,661739,855Home equity7,71369520 388,0692,466398,837Individuals' loans for household and other personal expenditures    76,35114676,497Lease financing receivables, net of unearned income295 85 380Other commercial loans208,028560   208,588Loans$3,620,162$133,858$156,136$1,052,339$11,349$4,973,844  December 31, 2015 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$962,340$48,432$45,984$319  $1,057,075Agriculture production financing and other loans to farmers77,8846,66513,162   97,711Real estate Loans:     Construction345,4491,2711,790 $18,114$80366,704Commercial and farmland1,679,14146,44277,338 1,802,921Residential171,5763,10710,428593,5337,461786,105Home equity8,21848600 337,7182,029348,613Individuals' loans for household and other personal expenditures    74,49122674,717Lease financing receivables, net of unearned income495 93 588Other commercial loans159,388   159,388Loans$3,404,491$105,965$149,395$319$1,023,856$9,796$4,693,822                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Past due aging of loan portfolio by loan class                 | The tables below show a past due aging of the Corporation’s loan portfolio, by loan class, as of September 30, 2016, and December 31, 2015.  September 30, 2016 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$1,143,456$701$2,381$3,082$1,146,538Agriculture production financing and other loans to farmers91,6391,5301,53093,169Real estate Loans:     Construction367,969$1271272368,241Commercial and farmland1,919,826976$2,7371,21716,98321,9131,941,739Residential724,2003,3901,5748310,60815,655739,855Home equity394,9778415102932,2163,860398,837Individuals' loans for household and other personal expenditures75,9482951073111654976,497Lease financing receivables, net of unearned income380 380Other commercial loans208,588  208,588Loans$4,926,983$6,203$4,928$1,625$34,105$46,861$4,973,844 December 31, 2015 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$1,052,275$166$4,634$4,800$1,057,075Agriculture production financing and other loans to farmers96,88482782797,711Real estate Loans:      Construction362,0843,884 7364,620366,704Commercial and farmland1,786,0925,55211,27716,8291,802,921Residential765,6346,090$2,061$50211,81820,471786,105Home equity344,3441,4335603241,9524,269348,613Individuals' loans for household and other personal expenditures73,990445568114572774,717Lease financing receivables, net of unearned income588   588Other commercial loans159,324 64 64159,388Loans$4,641,215$17,570$2,741$907$31,389$52,607$4,693,822                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Schedules of troubled debt restructurings                      | The following tables summarize troubled debt restructurings in the Corporation's loan portfolio that occurred during the periods indicated:Three Months Ended September 30, 2016Nine Months Ended September 30, 2016Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$260$2603Agriculture production financing and other loans to farmers   1,606 1,472 5Real estate Loans:      Commercial and farmland$87$9513,9783,9557Residential6116781172481114Home Equity555822292043Total$753$83114$6,797$6,70232 Three Months Ended September 30, 2015Nine Months Ended September 30, 2015Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$363$2182$4,111$2,1157Real estate Loans:     Construction79801Commercial and farmland74474411,2813,0253Residential11131559084Home Equity23924212392421Total$1,357$1,2175$5,765$6,37016The following tables summarize the recorded investment of troubled debt restructurings as of September 30, 2016 and 2015, by modification type, that occurred during the periods indicated:Three Months Ended September 30, 2016TermModificationRateModificationCombinationTotalModificationReal estate Loans:   Commercial and farmland$95$95Residential$663663           Home Equity 5656Total$719$95$814Nine Months Ended September 30, 2016TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$197$197Agriculture production financing and other loans to farmers$898   898Real estate Loans:    Commercial and farmland4163,4873,903Residential$773773           Home Equity 197  197Total$1,314$970$3,684$5,968Three Months Ended September 30, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$138$75$213Real estate Loans:   Commercial and farmland744744Residential$1313Home Equity242242Total$138$255$819$1,212Nine Months Ended September 30, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$806$1,080$1,886Real estate Loans:   Commercial and farmland1,3371,0042,341Residential850$59909Home Equity242242Total$2,993$301$2,084$5,378                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Troubled debt restructurings that subsequently defaulted       | The following tables summarize troubled debt restructures that occurred during the three and nine months ended September 30, 2016 and September 30, 2015, that subsequently defaulted during the period indicated and remained in default at period end. For purposes of this discussion, a loan is considered in default if it is 30 or more days past due.  Three Months Ended September 30, 2016Nine Months Ended September 30, 2016Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceCommercial and industrial loans3$197Real estate Loans:    Residential1$54154Total1$544$251Three Months Ended September 30, 2015Nine Months Ended September 30, 2015Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceReal estate Loans:    Residential1$211$21Total1$211$21                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |

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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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