| **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, 2012 and 2011: 2012 2011Cost at December 31:   Land$14,692 $14,296Buildings and Leasehold Improvements62,606 62,317Equipment42,564 39,789Total Cost119,862 116,402Accumulated Depreciation and Amortization(67,113) (65,389)Net$52,749 $51,013 |
| Schedule of Future Minimum Rental Payments for Operating Leases | The future minimum rental commitments required under the operating leases in effect at December 31, 2012, expiring at various dates through the year 2027 are as follows for the years ending December 31: Future Minimum Rental Commitments2013$2,28420142,02520151,85220161,4412017865After 20171,428Total Future Minimum Obligations$9,895                                               |

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| - Definition
Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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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.
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