| **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, 2016December 31, 2015Commercial and industrial loans$1,084,890$1,057,075Agricultural production financing and other loans to farmers95,13197,711Real estate loans:  Construction352,980366,704Commercial and farmland1,869,7031,802,921Residential758,870786,105Home Equity374,159348,613Individuals' loans for household and other personal expenditures75,20574,717Lease financing receivables, net of unearned income388588Other commercial loans180,103159,388             Loans$4,791,429$4,693,822Allowance for loan losses(62,186)(62,453)             Net Loans$4,729,243$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 six months ended June 30, 2016, and June 30, 2015: Three Months Ended June 30, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, April 1$26,264$22,317$2,647$10,856$2$62,086Provision for losses40020044146790Recoveries on loans6832761072731,339Loans charged off(1,026)(513)(114)(376)(2,029)Balances, June 30, 2016$26,321$22,280$2,684$10,899$2$62,186 Six Months Ended June 30, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$26,478$22,145$2,689$11,139$2$62,453Provision for losses539414773101,340Recoveries on loans9751,2281855852,973Loans charged off(1,671)(1,507)(267)(1,135)(4,580)Balances, June 30, 2016$26,321$22,280$2,684$10,899$2$62,186Three Months Ended June 30, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, April 1$30,007$16,383$3,138$13,269$4$62,801Provision for losses1,190(502)(200)(72)1417Recoveries on loans4371471017471,432Loans charged off(155)(200)(112)(1,633)(2,100)Balances, June 30, 2015$31,479$15,828$2,927$12,311$5$62,550 Six Months Ended June 30, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$28,824$19,327$2,658$13,152$3$63,964Provision for losses3,024(3,398)3274622417Recoveries on loans8875591798792,504Loans charged off(1,256)(660)(237)(2,182)(4,335)Balances, June 30, 2015$31,479$15,828$2,927$12,311$5$62,550                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 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: June 30, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$1,573$276$69$1,918Collectively evaluated for impairment24,74821,824$2,68410,808$260,066Loans Acquired with Deteriorated Credit Quality18022202Total Allowance for Loan Losses$26,321$22,280$2,684$10,899$2$62,186Loan Balances:      Individually evaluated for impairment$7,841$21,118$3,462$32,421Collectively evaluated for impairment1,345,8262,155,077$75,2051,126,707$3884,703,203Loans Acquired with Deteriorated Credit Quality6,45746,4882,86055,805Loans$1,360,124$2,222,683$75,205$1,133,029$388$4,791,429 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:June 30, 2016December 31, 2015Commercial and industrial loans$3,413$4,634Agriculture production financing and other loans to farmers1,471827Real estate Loans:  Construction721736Commercial and farmland15,54111,277Residential9,95211,818Home Equity2,3451,952Individuals' loans for household and other personal expenditures122145Total$33,565$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:  June 30, 2016 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:  Commercial and industrial loans$19,322$10,183Agriculture production financing and other loans to farmers709701Real estate Loans:  Construction8,0894,091Commercial and farmland83,02861,319Residential8,6505,016Home equity176139Other commercial loans16Total$119,990$81,449Impaired loans with related allowance:  Commercial and industrial loans$2,491$2,114$1,007Agriculture production financing and other loans to farmers1,3311,301566Real estate Loans:   Commercial and farmland2,1451,978456Residential87780191Total$6,844$6,194$2,120Total Impaired Loans$126,834$87,643$2,120 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 June 30, 2016Six Months Ended June 30, 2016 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial loans$10,372$128$10,307$231Agriculture production financing and other loans to farmers83428822Real estate Loans:  Construction4,085744,074147Commercial and farmland62,17386163,1361,706Residential5,069545,390107Home equity138139Total$82,671$1,119$83,928$2,193Impaired loans with related allowance:    Commercial and industrial loans$2,120$9$2,129$19Agriculture production financing and other loans to farmers1,3211,405Real estate Loans:  Commercial and farmland1,9862,008Residential840860Total$6,267$9$6,402$19Total Impaired Loans$88,938$1,128$90,330$2,212 Three Months Ended June 30, 2015Six Months Ended June 30, 2015 AverageRecorded InvestmentInterestIncome RecognizedAverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:    Commercial and industrial loans$12,154$111$12,942$200Agriculture production financing and other loans to farmers1,3251,343Real estate Loans:Construction7,648957,898191Commercial and farmland66,62589466,9571,765Residential7,114577,150107Home equity208208Total$95,074$1,157$96,498$2,263Impaired loans with related allowance:Commercial and industrial loans$3,204$10$3,214$19Real estate Loans:Commercial and farmland2,6222,727Residential2,6002,603Total$8,426$10$8,544$19Total Impaired Loans$103,500$1,167$105,042$2,282 |
| 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. June 30, 2016 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$1,022,507$29,117$33,266  $1,084,890Agriculture production financing and other loans to farmers37,11432,78425,233   95,131Real estate Loans:       Construction328,3665,0231,606$17,908$77352,980Commercial and farmland1,733,50351,79384,407 1,869,703Residential157,1867,9536,352579,4037,976758,870Home equity7,37797743 363,6182,324374,159Individuals' loans for household and other personal expenditures    75,08412175,205Lease financing receivables, net of unearned income300 88 388Other commercial loans180,103   180,103Loans$3,466,456$126,767$151,695$1,036,013$10,498$4,791,429  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 June 30, 2016, and December 31, 2015.  June 30, 2016 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$1,080,184$998$282$13$3,413$4,706$1,084,890Agriculture production financing and other loans to farmers92,9792504311,4712,15295,131Real estate Loans:     Construction351,1471,1127211,833352,980Commercial and farmland1,850,8822,38489615,54118,8211,869,703Residential743,9513,8478882329,95214,919758,870Home equity370,6026284671172,3453,557374,159Individuals' loans for household and other personal expenditures74,7442974212246175,205Lease financing receivables, net of unearned income388 388Other commercial loans180,103  180,103Loans$4,744,980$8,404$4,118$362$33,565$46,449$4,791,429 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 June 30, 2016Six Months Ended June 30, 2016Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$260$2603Agriculture production financing and other loans to farmers$1,141 $1,141 3 1,606 1,472 5Real estate Loans:      Commercial and farmland3,5393,50853,8913,8606Residential1131333Home Equity17414611741461Total$4,854$4,7959$6,044$5,87118 Three Months Ended June 30, 2015Six Months Ended June 30, 2015Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansPre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$1,386$5361$3,748$1,8975Real estate Loans:     Construction79801Commercial and farmland53753715372,2802Residential208712448953Total$1,943$1,9444$4,408$5,15211The following tables summarize the recorded investment of troubled debt restructurings as of June 30, 2016 and 2015, by modification type, that occurred during the periods indicated:Three Months Ended June 30, 2016TermModificationRateModificationCombinationTotalModificationAgriculture production financing and other loans to farmers$1,141   $1,141Real estate Loans:   Commercial and farmland418$3,0863,504           Home Equity $143143Total$1,559$143$3,086$4,788Six Months Ended June 30, 2016TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$198$198Agriculture production financing and other loans to farmers$1,141 $49  1,190Real estate Loans:    Commercial and farmland4183,4333,851Residential112112           Home Equity 143  143Total$1,559$304$3,631$5,494Three Months Ended June 30, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$492$492Real estate Loans:   Commercial and farmland$240240Residential850$21871Total$1,342$21$240$1,603Six Months Ended June 30, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$1,234$1,030$2,264Real estate Loans:   Construction199199Commercial and farmland1,4422401,682Residential850$47897Total$3,725$47$1,270$5,042                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Troubled debt restructurings that subsequently defaulted       | The following tables summarize troubled debt restructures that occurred during the three and six months ended June 30, 2016, that subsequently defaulted during the period indicated and remained in default at period end.  There were no troubled debt restructures that  occurred during the three and six months ended June 30, 2015 that subsequently defaulted during this period.  For purposes of this discussion, a loan is considered in default if it is 30 or more days past due.  Three Months Ended June 30, 2016Six Months Ended June 30, 2016Number ofLoansRecordedBalanceNumber ofLoansRecordedBalanceCommercial and industrial loans1$724$269Real estate Loans:    Residential155155Total2$1275$324                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |

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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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