| **Premises and Equipment (Tables)**                             | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Property, Plant and Equipment [Abstract]**                    |                                                                                                                                                                                                                                                                                                                                                                                                      |
| Schedule of Premises and Equipment                              | The following table summarizes the Corporation's premises and equipment as of December 31, 2016 and 2015: 2016 2015Cost at December 31:   Land$25,035 $26,510Buildings and Leasehold Improvements114,444 115,461Equipment65,547 64,892Total Cost205,026 206,863Accumulated Depreciation and Amortization(110,594) (109,215)Net$94,432 $97,648 |
| Schedule of Future Minimum Rental Payments for Operating Leases | The future minimum rental commitments required under the operating leases in effect at December 31, 2016, expiring at various dates through the year 2035 are as follows for the years ending December 31: Future Minimum Rental Commitments2017$3,29820181,99820191,62420201,38820211,056After 20216,487Total Future Minimum Obligations$15,851                                                     |

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| - Definition
Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.
+ References
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| - Definition
Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.
+ References
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