| **Pension and Other Post Retirement Benefit Plans (Tables)**                                         | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| **Compensation and Retirement Disclosure [Abstract]**                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Schedule of Plans' Funded Status and Amounts Recognized in the Balance Sheets                        | The table below sets forth the plans’ funded status and amounts recognized in the consolidated balance sheets at December 31, using measurement dates of December 31, 2016 and 2015. 2016 2015Change in Benefit Obligation:   Benefit obligation at beginning of year$71,747 $80,650Service cost9 55Interest cost3,273 3,087Actuarial loss (gain)2,679 (5,617)Benefits paid(5,263) (6,428)Net transfers in from Ameriana acquisition11,645 Benefit obligation at end of year$84,090 $71,747    Change in Plan Assets:   Fair value of plan assets at beginning of year$71,396 $77,139Actual return on plan assets6,959 153Employer contributions739 532Benefits paid(5,263) (6,428)Ameriana acquisition9,726 End of year83,557 71,396Funded status at end of year$(533) $(351)    Assets and Liabilities Recognized in the Balance Sheets:   Deferred tax asset$7,041 $7,461Assets$5,028 $4,006Liabilities$5,561 $4,357    Amounts Recognized in Accumulated Other Comprehensive Income Not Yet Recognized as Components of Net Periodic (Benefit) Cost, net of tax, consist of:   Accumulated loss$(12,624) $(13,857)Prior service credit(451) (305) $(13,075) $(14,162)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Schedule of Accumulated Benefit Obligation in Excess of Plan Assets                                  | Information for pension plans with an accumulated benefit obligation in excess of plan assets is included in the table below.  December 31, 2016 December 31, 2015Projected benefit obligation$5,561 $4,357Accumulated benefit obligation$5,561 $4,357Fair value of plan assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Schedule of Net Periodic Pension Costs                                                               | The following table shows the components of net periodic pension costs: December 31, 2016 December 31, 2015 December 31, 2014Service cost$9 $55 $73Interest cost3,273 3,087 3,235Expected return on plan assets(4,508) (4,471) (4,467)Amortization of prior service costs79 64 81Amortization of net loss1,656 1,722 478Net periodic pension (benefit) cost$509 $457 $(600)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Schedule of Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)      | Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): December 31, 2016 December 31, 2015 December 31, 2014Net periodic pension (benefit) cost$509 $457 $(600)Net gain (loss)(228) 1,299 (12,203)Amortization of loss1,656 1,722 478Amortization of prior service cost79 64 81Total recognized in other comprehensive income (loss)1,507 3,085 (11,644)Total recognized in net periodic pension cost and other comprehensive income (loss)$998 $2,628 $(11,044)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Schedule of Amounts in Accumulated Other Comprehensive Income to be Recognized over Next Fiscal Year | The estimated net loss and transition obligation for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into net periodic pension cost over the next fiscal year are:December 31, 2016December 31, 2015 December 31, 2014Amortization of net loss$(1,208)$(1,505) $(1,770)Amortization of prior service cost(90)(61) (64)Total$(1,298)$(1,566) $(1,834)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Assumptions Used                                                                         | Significant assumptions include: December 31, 2016 December 31, 2015 December 31, 2014Weighted-average Assumptions Used to Determine Benefit Obligation:     Discount rate4.20% 4.50% 4.00%Rate of compensation increase for accruing active participants3.00% 3.00% 3.00%Weighted-average Assumptions Used to Determine Cost:    Discount rate4.50% 4.00% 4.80%Expected return on plan assets6.00% 6.00% 6.00%Rate of compensation increase for accruing active participants3.00% 3.00% 3.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Schedule of Expected Benefit Payments                                                                | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid as of December 31, 2016. The minimum contribution required in 2017 will likely be zero but the Corporation may decide to make a discretionary contribution during the year.2017$5,75620185,64420195,80220205,68820215,557After 202127,118 $55,565                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Schedule of Allocation of Plan Assets                                                                | Following is a description of the valuation methodologies used for pension plan assets measured at fair value on a recurring basis, as well as the general classification of pension plan assets pursuant to the valuation hierarchy.Where quoted market prices are available in an active market, plan assets are classified within Level 1 of the valuation hierarchy.  Level 1 plan assets total $64,064,000 and include cash and cash equivalents, common stocks, mutual funds and corporate bonds and notes.  If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of plan assets with similar characteristics or discounted cash flows.  Level 2 plan assets total $19,493,000 and include governmental agencies, taxable municipals, common collective trust investments (which are classified below as Party-in-Interest investments -- common bond fund and common equity fund) and certificates of deposit.  In certain cases where Level 1 or Level 2 inputs are not available, plan assets are classified within Level 3 of the hierarchy.  There are no assets classified within Level 3 of the hierarchy at December 31, 2016 and 2015.  Fair Value Measurements Using   Quoted Prices inActive Markets forIdentical Assets Significant Other Observable Inputs SignificantUnobservableInputsDecember 31, 2016Fair Value(Level 1)(Level 2)(Level 3)Cash & Cash Equivalents$3,778$3,778Corporate Bonds and Notes10,64610,646Government Agency and Municipal Bonds and Notes6,855$6,855Certificates of Deposit1,2681,268Party-in-Interest InvestmentsCommon Stock2,2782,278Common Bond Fund4,7444,744Common Equity Fund6,6266,626Mutual FundsTaxable Bond7,9747,974Large Cap Equity19,61119,611Mid Cap Equity10,30410,304Small Cap Equity4,6804,680International Equity3,0933,093Specialty Alternative Equity1,7001,700 $83,557 $64,064 $19,493    Fair Value Measurements Using   Quoted Prices inActive Markets forIdentical Assets Significant Other Observable Inputs SignificantUnobservableInputsDecember 31, 2015Fair Value (Level 1) (Level 2) (Level 3)Cash & Cash Equivalents$1,608 $1,608    Corporate Bonds and Notes9,113 9,113    Government Agency and Municipal Bonds and Notes6,993   $6,993  Certificates of Deposit1,511   1,511  Party-in-Interest Investments       Common Stock1,538 1,538    Common Bond Fund4,647   4,647  Common Equity Fund5,812   5,812  Mutual Funds       Taxable Bond4,536 4,536    Large Cap Equity18,528 18,528    Mid Cap Equity8,537 8,537    Small Cap Equity3,578 3,578    International Equity3,353 3,353    Specialty Alternative Equity1,642 1,642     $71,396 $52,433 $18,963 Plan assets are re-balanced quarterly. At December 31, 2016 and 2015, plan assets by category are as follows: December 31, 2016December 31, 2015 ActualTargetActualTargetCash and cash equivalents4.5%3.0%2.2%2.0%Equity securities55.855.058.160.0Debt securities37.740.037.436.0Alternative investments2.02.02.32.0 100.0%100.0%100.0%100.0% |

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| - Definition
Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets.
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| - Definition
Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans.  This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.
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| - Definition
Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.
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| - Definition
Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.
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Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period.
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| - Definition
Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.
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| - Definition
Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.
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| - Definition
Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.
+ References
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