| **Pension and Other Post Retirement Benefit Plans (Tables)**                                                                                        | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Compensation and Retirement Disclosure [Abstract]**                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Schedule of Changes in Benefit Obligation, Changes in Plan Assets and the Funded Status of the Pension Plan and Other Post Retirement Benefit Plans | 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, 2014 and 2013. 2014 2013Change in Benefit Obligation:   Benefit obligation at beginning of year$62,270 $69,166Service cost73 131Interest cost3,235 2,670Actuarial loss (gain)12,968 (5,597)Benefits paid(5,541) (4,100)Net transfers in from CFS acquisition7,645  Benefit obligation at end of year$80,650 $62,270    Change in Plan Assets:   Fair value of plan assets at beginning of year$69,871 $62,865Actual return on plan assets5,232 10,610Employer contributions504 496Benefits paid(5,541) (4,100)CFS acquisition7,073 End of year77,139 69,871Funded status at end of year$(3,511) $7,601    Assets and Liabilities Recognized in the Balance Sheets:   Deferred tax asset$8,541 $4,266Assets$1,329 $12,383Liabilities$4,840 $4,782    Amounts Recognized in Accumulated Other Comprehensive Income Not Yet Recognized as Components of Net Periodic (Benefit) Cost Consist of:   Accumulated loss$(15,863) $(7,922)Prior service credit(346) (28) $(16,209) $(7,950)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Schedule of Accumulated Benefit Obligations in Excess of Fair Value 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, 2014 December 31, 2013Projected benefit obligation$4,840 $4,782Accumulated benefit obligation$4,840 $4,782Fair value of plan assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Schedule of Net Periodic Pension Costs                                                                                                              | The following table shows the components of net periodic pension costs: December 31, 2014 December 31, 2013 December 31, 2012Service cost$73 $131 $161Interest cost3,235 2,670 2,990Expected return on plan assets(4,467) (4,265) (4,216)Amortization of prior service costs81 25 25Amortization of net loss478 2,131 2,207Net periodic pension (benefit) cost$(600) $692 $1,167                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Schedule of Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, Net of Tax                                                | Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): December 31, 2014 December 31, 2013 December 31, 2012Net periodic pension (benefit) cost$(600) $692 $1,167Net gain (loss)(12,203) 11,942 (1,242)Amortization of loss478 2,131 2,207Amortization of prior service cost81 25 25Total recognized in other comprehensive income (loss)(11,644) 14,098 990Total recognized in net periodic pension cost and other comprehensive income (loss)$(11,044) $13,406 $(177)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) 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, 2014December 31, 2013 December 31, 2012Amortization of net loss$(1,770)$(533) $(2,158)Amortization of prior service cost(64)(25) (25)Total$(1,834)$(558) $(2,183)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Schedule of Assumptions Used                                                                                                                        | Significant assumptions include: December 31, 2014 December 31, 2013 December 31, 2012Weighted-average Assumptions Used to Determine Benefit Obligation:     Discount rate4.00% 4.80% 4.00%Rate of compensation increase for accruing active participants3.00% 3.00% 3.00%Weighted-average Assumptions Used to Determine Cost:     Discount rate4.80% 4.00% 4.50%Expected return on plan assets6.00% 7.00% 7.00%Rate of compensation increase for accruing active participants3.00% 3.00% 4.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Schedule of Expected Benefit Payments                                                                                                               | The minimum contribution required in 2015 will likely be zero but the Corporation may decide to make a discretionary contribution during the year.2015$4,76120164,75720174,75120184,78320194,997After 201925,125 $49,174                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of Allocation of Plan Assets                                                                                                               | Plan assets are re-balanced quarterly. At December 31, 2014 and 2013, plan assets by category are as follows: December 31, 2014December 31, 2013 ActualTargetActualTargetCash and cash equivalents2.6%2.0%2.7%2.0%Equity securities58.760.062.260.0Debt securities36.536.033.236.0Alternative investments2.22.01.92.0 100.0%100.0%100.0%100.0%There are no assets classified within Level 3 of the hierarchy at December 31, 2014 and 2013.  Fair Value Measurements Using   Quoted Prices inActive Markets forIdentical Assets Significant Other Observable Inputs SignificantUnobservableInputsDecember 31, 2014Fair Value(Level 1)(Level 2)(Level 3)Cash & Cash Equivalents$2,032$2,032Corporate Bonds and Notes9,3849,384Government Agency and Municipal Bonds and Notes8,252$8,252Certificates of Deposit1,0011,001Party-in-Interest Investments   Common Stock1,3761,376Common Bond Fund4,6154,615Common Equity Fund5,8585,858Mutual FundsTaxable Bond4,9874,987Large Cap Equity21,18521,185Mid Cap Equity9,4349,434Small Cap Equity3,8723,872International Equity3,4743,474Specialty Alternative Equity1,6691,669 $77,139 $57,413 $19,726 $—   Fair Value Measurements Using   Quoted Prices inActive Markets forIdentical Assets Significant Other Observable Inputs SignificantUnobservableInputsDecember 31, 2013Fair Value (Level 1) (Level 2) (Level 3)Cash & Cash Equivalents$1,864 $1,864    Corporate Bonds and Notes6,076 6,076    Government Agency and Municipal Bonds and Notes8,263   $8,263  Certificates of Deposit607   607  Party-in-Interest Investments       Common Stock1,375 1,375    Common Bond Fund5,318   5,318  Common Equity Fund4,507   4,507  Mutual Funds       Taxable Bond3,901 3,901    Large Cap Equity20,617 20,617    Mid Cap Equity8,721 8,721    Small Cap Equity3,584 3,584    International Equity3,727 3,727    Specialty Alternative Equity1,311 1,311     $69,871 $51,176 $18,695 $— |

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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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| - Definition
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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