| **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, 2015December 31, 2014Commercial and industrial loans$938,937$896,688Agricultural production financing and other loans to farmers95,652104,927Real estate loans:  Construction237,036207,221Commercial and farmland1,646,4181,672,661Residential640,451647,315Home Equity286,914286,529Individuals' loans for household and other personal expenditures70,22373,400Lease financing receivables, net of unearned income8531,106Other loans49,04835,018 Loans$3,965,532$3,924,865Allowance for loan losses(62,801)(63,964)Net Loans$3,902,731$3,860,901                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 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, 2015, and March 31, 2014:  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            Three Months Ended March 31, 2014 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, January 1$27,176$23,102$2,515$15,077$67,870Provision for losses2,387(1,257)(12)(1,098)$(20)Recoveries on loans2,050790136604203,600Loans charged off(706)(277)(229)(675)(1,887)Balances, March 31, 2014$30,907$22,358$2,410$13,908$69,583                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Allowance for Credit Losses and Loan Portfolio by Loan Segment | The following tables show the Corporation’s allowance for credit losses and loan portfolio by loan segment as of the periods indicated:  March 31, 2015 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$2,700$1,017$359 $4,076Collectively evaluated for impairment27,30715,081$3,13812,715$458,245Loans Acquired with Deteriorated Credit Quality285195480Total Allowance for Loan Losses$30,007$16,383$3,138$13,269$4$62,801Loan Balances:      Individually evaluated for impairment$11,432$21,668 $4,298 $37,398Collectively evaluated for impairment1,063,8221,806,864$70,223918,527$8533,860,289Loans Acquired with Deteriorated Credit Quality8,38354,9224,54067,845Loans$1,083,637$1,883,454$70,223$927,365$853$3,965,532   December 31, 2014 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance Balances:      Individually evaluated for impairment$1,455$470 $194 $2,119Collectively evaluated for impairment27,36918,207$2,65812,958$361,195Loans Acquired with Deteriorated Credit Quality650650Total Allowance for Loan Losses$28,824$19,327$2,658$13,152$3$63,964Loan Balances:      Individually evaluated for impairment$16,108$23,963 $4,022 $44,093Collectively evaluated for impairment1,011,1221,796,797$73,400925,282$1,1063,807,707Loans Acquired with Deteriorated Credit Quality9,40359,1224,54073,065Loans$1,036,633$1,879,882$73,400$933,844$1,106$3,924,865                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| 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, 2015December 31, 2014Commercial and industrial loans$8,249$7,048Agriculture production financing and other loans to farmers1,9785,800Real estate Loans:  Construction1,5851,439Commercial and farmland16,93119,350Residential13,31412,933Home Equity2,1411,988Individuals' loans for household and other personal expenditures123231Total$44,321$48,789                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 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, 2015 UnpaidPrincipalBalanceRecordedInvestmentRelatedAllowanceImpaired loans with no related allowance:  Commercial and industrial loans$27,308$13,460Agriculture production financing and other loans to farmers307302Real estate Loans:  Construction10,8117,856Commercial and farmland88,06965,281Residential9,7926,273Home equity546474Other loans28Total$136,861$93,646Impaired loans with related allowance:  Commercial and industrial loans$4,434$4,376$2,461Agriculture production financing and other loans to farmers3,4151,676239Real estate Loans:   Commercial and farmland3,1713,0931,302Residential1,8761,759554Total$12,896$10,904$4,556Total Impaired Loans$149,757$104,550$4,556 December 31, 2014 UnpaidPrincipalBalance RecordedInvestment RelatedAllowanceImpaired loans with no related allowance:     Commercial and industrial loans$35,514 $18,029  Agriculture production financing and other loans to farmers26 22  Real estate Loans:     Construction12,956 9,318  Commercial and farmland95,856 68,187  Residential10,591 6,839  Home equity3,590 398  Other loans30   Total$158,563 $102,793  Impaired loans with related allowance:     Commercial and industrial loans$1,766 $1,684 $1,055Agriculture production financing and other loans to farmers6,7775,777400Real estate Loans:     Commercial and farmland7,159 4,971 1,120Residential1,001 998 194Total$16,703 $13,430 $2,769Total Impaired Loans$175,266 $116,223 $2,769 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 Three Months Ended March 31, 2014 AverageRecorded InvestmentInterestIncome RecognizedImpaired loans with no related allowance:  Commercial and industrial loans$16,377$21Agriculture production financing and other loans to farmers29Real estate Loans:Construction10,44028Commercial and farmland81,617243Residential4,1468Home equity144Other loans6Total$112,759$300Impaired loans with related allowance:Commercial and industrial loans$1,752$3Real estate Loans:Commercial and farmland4,3981Total$6,150$4Total Impaired Loans$118,909$304 |
| 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, 2015 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$867,157$28,888$41,023$1,869  $938,937Agriculture production financing and other loans to farmers89,4542,4693,729   95,652Real estate Loans:       Construction217,1612,3592,493 $14,582$441237,036Commercial and farmland1,521,98948,21976,208 21,646,418Residential149,0214,23210,845466,8069,547640,451Home equity6,47818585 277,5782,255286,914Individuals' loans for household and other personal expenditures    70,08214170,223Lease financing receivables, net of unearned income748 105 853Other loans49,048   49,048Loans$2,901,056$86,185$134,988$1,869$829,048$12,386$3,965,532  December 31, 2014 CommercialPassCommercialSpecialMentionCommercial SubstandardCommercialDoubtfulCommercial LossConsumer PerformingConsumerNon-PerformingTotalCommercial and industrial loans$823,732$24,455$48,226$275  $896,688Agriculture production financing and other loans to farmers96,1551,1957,577   104,927Real estate Loans:     Construction185,3943,1642,928 $15,588$147207,221Commercial and farmland1,552,78129,48490,161 2351,672,661Residential149,4306,32110,918470,9729,674647,315Home equity6,36812690 277,5711,888286,529Individuals' loans for household and other personal expenditures    73,16523573,400Lease financing receivables, net of unearned income998 108 1,106Other loans35,018   35,018Loans$2,849,876$64,631$160,608$275$837,296$12,179$3,924,865                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Past Due Aging of Loan Portfolio by Loan Class                 | The following table shows a past due aging of the Corporation’s loan portfolio, by loan class as of March 31, 2015, and December 31, 2014: March 31, 2015 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$927,244$2,057$1,166$221$8,249$11,693$938,937Agriculture production financing and other loans to farmers93,3493251,9782,30395,652Real estate Loans:       Construction235,0771382361,5851,959237,036Commercial and farmland1,623,6565,26130526516,93122,7621,646,418Residential623,3942,44676153613,31417,057640,451Home equity282,3441,7343163792,1414,570286,914Individuals' loans for household and other personal expenditures69,829173801812339470,223Lease financing receivables, net of unearned income675178 178853Other loans49,048  49,048Loans$3,904,616$12,312$2,628$1,655$44,321$60,916$3,965,532 December 31, 2014 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$882,596$4,006$53$2,985$7,048$14,092$896,688Agriculture production financing and other loans to farmers98,2368915,8006,691104,927Real estate Loans:       Construction204,6831,01782 1,4392,538207,221Commercial and farmland1,642,0169,84677867119,35030,6451,672,661Residential626,8214,8761,83185412,93320,494647,315Home equity282,8281,2133521481,9883,701286,529Individuals' loans for household and other personal expenditures72,85325853523154773,400Lease financing receivables, net of unearned income1,106   1,106Other loans35,018   35,018Loans$3,846,157$22,107$3,149$4,663$48,789$78,708$3,924,865                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Summary 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, 2015Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansCommercial and industrial loans$2,362$1,3614Real estate Loans:   Construction79801Commercial and farmland1,7431Residential24241Total$2,465$3,2087 Three Months Ended March 31, 2014Pre-ModificationRecordedBalancePost-ModificationRecordedBalanceNumberofLoansReal estate Loans:  Residential$131$1343Individuals' loans for household and other personal expenditures15151Total$146$1494The following tables show the recorded investment of troubled debt restructurings, by modification type, that occurred during the periods indicated: Three Months Ended March 31, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$253$1,079$1,332Real estate Loans:    Construction2 2Commercial and farmland1,5481,548Residential$2626Total$1,803$26$1,079$2,908        Three Months Ended March 31, 2014TermModificationRateModificationCombinationTotalModificationReal estate Loans:    Residential$134$134Individuals loans for household and other personal expenditures $1515Total$134$15$149        Loans secured by commercial and farm real estate made up 54 percent of the post-modification balance of troubled debt restructured loans made in the three months ended March 31, 2015.The following tables summarize the  troubled debt restructures that occurred during the three months ended March 31, 2015 and  March 31, 2014, that subsequently defaulted during the period indicated and remained in default at period end.  For purposes of this schedule, a loan is considered in default if it is 30 or more days past due.Three Months Ended March 31, 2015Number ofLoansRecordedBalanceReal estate Loans:  Home Equity1 $6Total1$6Three Months Ended March 31, 2014Number ofLoansRecordedBalanceCommercial and industrial loans1$146Real estate Loans:  Residential157Total2$203                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |

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Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.
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Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.
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Tabular disclosure of impaired financing receivables.
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Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.
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Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
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Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing.
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Tabular disclosure of financing receivables and troubled debt restructurings.
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