| **Loans and Allowance (Tables)**                               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Receivables [Abstract]**                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Composition of Loan Portfolio by Loan Class                    | The following table illustrates the composition of the Corporation’s loan portfolio by loan class for the years indicated:December 31, 2016December 31, 2015  Commercial and industrial loans$1,194,646$1,057,075Agricultural production financing and other loans to farmers79,68997,711Real estate loans:Construction418,703366,704Commercial and farmland1,953,0621,802,921Residential739,169786,105Home equity418,525348,613Individuals' loans for household and other personal expenditures77,47974,717Lease financing receivables, net of unearned income311588Other commercial loans258,061159,388Loans5,139,6454,693,822Allowance for loan losses(66,037)(62,453)Net Loans$5,073,608$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 twelve months ended December 31, 2016, 2015 and 2014:  Twelve Months Ended December 31, 2016 CommercialCommercial Real EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, December 31, 2015$26,478$22,145$2,689$11,139$2$62,453Provision for losses1,8761,8344321,5155,657Recoveries on loans1,8062,0903691,0915,356Loans charged off(2,464)(2,408)(567)(1,990)(7,429)Balances, December 31, 2016$27,696$23,661$2,923$11,755$2$66,037   Twelve Months Ended December 31, 2015 CommercialCommercial Real EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, December 31, 2014$28,824$19,327$2,658$13,152$3$63,964Provision for losses(1,901)1,710299310(1)417Recoveries on loans1,9112,5453521,5366,344Loans charged off(2,356)(1,437)(620)(3,859)(8,272)Balances, December 31, 2015$26,478$22,145$2,689$11,139$2$62,453  Twelve Months Ended December 31, 2014 CommercialCommercial Real EstateConsumerResidentialFinanceLeasesTotalAllowance for loan losses:      Balances, December 31, 2013$27,176$23,102$2,515$15,077$67,870Provision for losses3,459(464)423(839)$(19)2,560Recoveries on loans5,4353,2973771,7832410,916Loans charged off(7,246)(6,608)(657)(2,869)(2)(17,382)Balances, December 31, 2014$28,824$19,327$2,658$13,152$3$63,964                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 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 loan segment for the years indicated: December 31, 2016 CommercialCommercialReal EstateConsumerResidentialFinanceLeasesTotalAllowance balances:      Individually evaluated for impairment$37$553$298$888Collectively evaluated for impairment27,65923,108$2,92311,457$265,149Loans acquired with deteriorated credit qualityTotal Allowance for Loan Losses$27,696$23,661$2,923$11,755$2$66,037Loan balances:      Individually evaluated for impairment$4,762$21,3589$4,450$30,579Collectively evaluated for impairment1,520,9812,315,686$77,4701,151,396$3115,065,844Loans acquired with deteriorated credit quality6,65334,7211,84843,222Loans$1,532,396$2,371,765$77,479$1,157,694$311$5,139,645December 31, 2015CommercialCommercialReal 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 for the years indicated:December 31, 2016December 31, 2015Commercial and industrial loans$1,839$4,634Agriculture production financing and other loans to farmers1,329 827Real estate loans: Construction73736Commercial and farmland15,75411,277Residential9,52311,818Home equity1,4571,952Individuals' loans for household and other personal expenditures23145Total$29,998$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 for the years indicated: December 31, 2016 Unpaid PrincipalBalanceRecordedInvestmentRelatedAllowanceAverage Recorded InvestmentInterest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial loans$17,645$10,074 $13,393$499Agriculture production financing and other loans to farmers757680 7503Real estate loans:     Construction5,9463,178 3,255258Commercial and farmland67,93649,731 51,7402,978Residential8,0394,664 5,410167Home equity8244 44Other commercial loans11 Total$100,416$68,371 $74,592$3,905Impaired loans with related allowance:     Agriculture production financing and other loans to farmers$660$660$36$691Real estate loans:     Commercial and farmland4,2382,9855532,989Residential65342338Total$4,963$3,679$612$3,718Total Impaired Loans$105,379$72,050$612$78,310$3,905 December 31, 2015 Unpaid PrincipalBalance RecordedInvestment RelatedAllowance Average Recorded Investment Interest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial loans$22,151$11,669 $12,578$488Agriculture production financing and other loans to farmers370361 439 Real estate loans:         Construction4,5512,336 3,662157Commercial and farmland95,93069,024 71,5693,328Residential11,2627,338 7,926244Home equity297247 249Other commercial loans20 Total$134,581$90,975$96,423$4,217Impaired loans with related allowance:     Commercial and industrial loans$3,043$2,690$1,247$2,752$38Agriculture production financing and other loans to farmers466 466 30 538 Real estate loans:     Commercial and farmland2,1441,9333921,868Residential2,3001,4631731,787Total$7,953$6,552$1,842$6,945$38Total Impaired Loans$142,534$97,527$1,842$103,368$4,255  December 31, 2014 Unpaid PrincipalBalanceRecordedInvestmentRelatedAllowanceAverage Recorded InvestmentInterest Income RecognizedImpaired loans with no related allowance:     Commercial and industrial loans$35,514$18,029 $18,711$362Agriculture production financing and other loans to farmers2622 26 Real estate loans:Construction12,9569,318 9,837427Commercial and farmland95,85668,187 70,8443,389Residential10,5916,839 6,987119Home equity3,590398 402Other commercial loans30 Total$158,563$102,793 $106,807$4,297Impaired loans with related allowance:     Commercial and industrial loans$1,766$1,684$1,055$1,721$40Agriculture production financing and other loans to farmers6,7775,7774008,0441Real estate loans:     Commercial and farmland7,1594,9711,1204,99924Residential1,0019981941,000Total$16,703$13,430$2,769$15,764$65Total Impaired Loans$175,266$116,223$2,769$122,571$4,362 |
| Credit Quality of Loan Portfolio by Loan Class                 | The following tables summarize the credit quality of the Corporation’s loan portfolio, by loan class for the years indicated.  Consumer non-performing loans include accruing consumer loans 90 plus days delinquent and consumer non-accrual loans.  The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified date.  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. December 31, 2016 Commercial PassCommercial Special MentionCommercial SubstandardCommercial DoubtfulCommercial LossConsumer PerformingConsumerNon PerformingTotalCommercial and industrial loans$1,117,545$30,919$46,182   $1,194,646Agriculture production financing and other loans to farmers30,71225,27323,704   79,689Real estate loans:     Construction398,6463,4901,858 $14,636$73418,703Commercial and farmland1,811,36760,02880,626 1,03471,953,062Residential146,2515,1066,046 574,0547,712739,169Home equity7,31047516 409,2371,415418,525Individuals' loans for household and other personal expenditures     77,4562377,479Lease financing receivables, net of unearned income22883 311Other commercial loans257,861200 258,061Loans$3,769,920$124,863$159,215                        $1,076,417$9,230$5,139,645 December 31, 2015 Commercial PassCommercial Special MentionCommercial SubstandardCommercial DoubtfulCommercial 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 1,802,921Residential171,5763,10710,428 593,5337,461786,105Home equity8,21848600 337,7182,029348,613Individuals' loans for household and other personal expenditures     74,49122674,717Lease financing receivables, net of unearned income49593 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, for the years indicated:December 31, 2016 Current30-59 DaysPast Due60-89 DaysPast DueLoans > 90 DaysAnd AccruingNon-AccrualTotal Past Due& Non-AccrualTotalCommercial and industrial loans$1,192,079$466$162$100$1,839$2,567$1,194,646Agriculture production financing and other loans to farmers78,3601,3291,32979,689Real estate loans:      Construction415,9752,655732,728418,703Commercial and farmland1,932,8961,3853,02715,75420,1661,953,062Residential725,3383,66463599,52313,831739,169Home equity415,96985024631,4572,556418,525Individuals' loans for household and other personal expenditures76,929470572355077,479Lease financing receivables, net of unearned income311 311Other commercial loans258,061258,061Loans$5,095,918$9,490$4,127$112$29,998$43,727$5,139,645  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:       Construction362,0843,8847364,620366,704Commercial 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 loans159,3246464159,388Loans$4,641,215$17,570$2,741$907$31,389$52,607$4,693,822                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Schedules of Troubled Debt Restructuring                       | The following tables summarize troubled debt restructures that occurred during the twelve months ended December 31, 2016 and 2015, 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.Twelve Months Ended December 31, 2016 Number of LoansRecorded BalanceCommercial and industrial loans3 $197Agriculture production financing and other loans to farmers1 661Real estate loans:   Commercial and farmland1 343Residential1 64Total6$1,265Twelve Months Ended December 31, 2015 Number of LoansRecorded BalanceReal estate loans:Residential1$21Total1$21The following tables summarize the recorded investment of troubled debt restructurings as of December 31, 2016 and 2015, by modification type, that occurred during the periods indicated: December 31, 2016TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans    $397 $397Agriculture production financing and other farm loans$660 $12   672Real estate loans:       Commercial and farmland297   3,456 3,753Residential238 928   1,166Home equity  266   266Individuals' loans for household and other personal expenditures  9   9Total$1,195 $1,215 $3,853 $6,263 December 31, 2015TermModificationRateModificationCombinationTotalModificationCommercial and industrial loans$761$1,053$1,814Real estate loans:    Commercial and farmland1,2311,0262,257Residential823$170451,038Home equity242242Individuals' loans for household and other personal expenditures2727Total$2,815$439$2,124$5,378The following tables summarize troubled debt restructurings in the Corporation's loan portfolio that occurred during the periods ended December 31, 2016 and 2015: December 31, 2016Pre-ModificationRecorded BalancePost-ModificationRecorded BalanceNumberof LoansCommercial and industrial loans$410 $410 4Agriculture production financing and other loans to farmers1,368 1,234 4Real estate loans:     Commercial and farmland3,978 3,954 7Residential1,126 1,183 17Home Equity266 244 4Individuals' loans for household and other personal expenditures17 10 1Total$7,165 $7,035 37   December 31, 2015Pre-ModificationRecorded BalancePost-ModificationRecorded BalanceNumberof LoansCommercial and industrial loans$4,111$2,1157Real estate loans:  Construction79801Commercial and farmland1,2813,0243Residential2001,11310Home equity263 242 1Individuals' loans for household and other personal expenditures26271Total $5,960$6,60123                                                                                                                                                                                                                                                                        |

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