| **Loans and Allowance (Tables)**                               | 3 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:March 31, 2016December 31, 2015Commercial and industrial loans$1,060,559$1,057,075Agricultural production financing and other loans to farmers92,13797,711Real estate loans:  Construction391,621366,704Commercial and farmland1,806,3951,802,921Residential769,592786,105Home Equity353,946348,613Individuals' loans for household and other personal expenditures73,62274,717Lease financing receivables, net of unearned income461588Other commercial loans161,574159,388             Loans$4,709,907$4,693,822Allowance for loan losses(62,086)(62,453)             Net Loans$4,647,821$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 months ended March 31, 2016, and March 31, 2015: Three Months Ended March 31, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$26,478$22,145$2,689$11,139$2$62,453Provision for losses13921433164550Recoveries on loans292952783121,634Loans charged off(645)(994)(153)(759)(2,551)Balances, March 31, 2016$26,264$22,317$2,647$10,856$2$62,086            Three Months Ended March 31, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$28,824$19,327$2,658$13,152$3$63,964Provision for losses1,834(2,896)5275341Recoveries on loans450412781321,072Loans charged off(1,101)(460)(125)(549)(2,235)Balances, March 31, 2015$30,007$16,383$3,138$13,269$4$62,801                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 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: March 31, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$967$192$59$1,218Collectively evaluated for impairment25,22922,075$2,64710,760$260,713Loans Acquired with Deteriorated Credit Quality685037155Total Allowance for Loan Losses$26,264$22,317$2,647$10,856$2$62,086Loan Balances:      Individually evaluated for impairment$7,899$22,411$4,136$34,446Collectively evaluated for impairment1,299,4882,127,038$73,6221,114,759$4614,615,368Loans Acquired with Deteriorated Credit Quality6,88348,5674,64360,093Loans$1,314,270$2,198,016$73,622$1,123,538$461$4,709,907 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 Quality149$4153Total 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:March 31, 2016December 31, 2015Commercial and industrial loans$3,694$4,634Agriculture production financing and other loans to farmers1,535827Real estate Loans:  Construction731736Commercial and farmland16,44011,277Residential11,67411,818Home Equity2,4491,952Individuals' loans for household and other personal expenditures196145Total$36,719$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:  March 31, 2016 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:  Commercial and industrial loans$21,751$11,559Agriculture production financing and other loans to farmers724716Real estate Loans:  Construction8,4824,300Commercial and farmland88,29364,710Residential11,9917,317Home equity296225Other commercial loans18Total$131,555$88,827Impaired loans with related allowance:  Commercial and industrial loans$1,610$1,357$620Agriculture production financing and other loans to farmers1,1501,150415Real estate Loans:   Commercial and farmland1,9071,738242Residential94687796Total$5,613$5,122$1,373Total Impaired Loans$137,168$93,949$1,373 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 March 31, 2016 AverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:  Commercial and industrial loans$12,052$109Agriculture production financing and other loans to farmers7161Real estate Loans:  Construction4,26285Commercial and farmland65,461871Residential7,74658Home equity225Total$90,462$1,124Impaired loans with related allowance:  Commercial and industrial loans$1,363$9Agriculture production financing and other loans to farmers1,315Real estate Loans:  Commercial and farmland1,756Residential879Total$5,313$9Total Impaired Loans$95,775$1,133 Three Months Ended March 31, 2015 AverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:  Commercial and industrial loans$16,150$139Agriculture production financing and other loans to farmers303Real estate Loans:Construction8,542104Commercial and farmland69,036878Residential8,52848Home equity5333Total$103,092$1,172Impaired loans with related allowance:Commercial and industrial loans$4,379$10Agriculture production financing and other loans to farmers3,991Real estate Loans:Commercial and farmland3,113Residential1,761Total$13,244$10Total Impaired Loans$116,336$1,182 |
| 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. March 31, 2016 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$984,052$46,952$29,555  $1,060,559Agriculture production financing and other loans to farmers48,60422,82920,704   92,137Real estate Loans:       Construction365,8084,0213,441$18,272$79391,621Commercial and farmland1,669,32255,33681,737 1,806,395Residential158,9318,09510,706584,2627,598769,592Home equity7,16472568 343,8122,330353,946Individuals' loans for household and other personal expenditures    73,32230073,622Lease financing receivables, net of unearned income371 90 461Other commercial loans161,56410   161,574Loans$3,395,816$137,315$146,801$1,019,668$10,307$4,709,907  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 March 31, 2016, and December 31, 2015.  March 31, 2016 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$1,054,549$2,017$239$60$3,694$6,010$1,060,559Agriculture production financing and other loans to farmers90,4521501,5351,68592,137Real estate Loans:      Construction385,2225,6687316,399391,621Commercial and farmland1,788,5911,355916,44017,8041,806,395Residential753,1213,56553969311,67416,471769,592Home equity349,9861,2981071062,4493,960353,946Individuals' loans for household and other personal expenditures73,05316810110419656973,622Lease financing receivables, net of unearned income461 461Other commercial loans161,574  161,574Loans$4,657,009$14,221$995$963$36,719$52,898$4,709,907 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 March 31, 2016Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$260$2603Agriculture production financing and other loans to farmers465 331 2Real estate Loans:   Commercial and farmland3523521Residential1131333Individuals' loans for household and other personal expenditures13131Total$1,203$1,08910 Three Months Ended March 31, 2015Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$2,362$1,3614Real estate Loans:  Construction79801Commercial and farmland1,7431Residential24241Total$2,465$3,2087The following tables summarize the recorded investment of troubled debt restructurings, by modification type, that occurred during the periods indicated:Three Months Ended March 31, 2016TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$260$260Agriculture production financing and other loans to farmers  $331   331Real estate Loans:   Commercial and farmland351351Residential123123Individuals' loans for household and other personal expenditures1313Total$467$611$1,078        Three Months Ended March 31, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$253$1,079$1,332Real estate Loans:   Construction22Commercial and farmland1,5481,548Residential$2626Total$1,803$26$1,079$2,908                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Troubled debt restructurings that subsequently defaulted       | The following tables summarize troubled debt restructures that occurred during the twelve months ended March 31, 2016 and March 31, 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 March 31, 2016Number ofLoansRecordedBalanceCommercial and industrial loans3$260Real estate Loans:  Commercial and farmland1717Total4$977Three Months Ended March 31, 2015Number ofLoansRecordedBalanceHome Equity1$6Total1$6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |

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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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