| **Derivative Financial Instruments (Tables)**                                            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Derivative Instruments and Hedging Activities Disclosure [Abstract]**                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet | The table below presents the fair value of the Corporation’s derivative financial instruments as well as their classification on the Balance Sheet as of December 31, 2012 and December 31, 2011. Asset DerivativesLiability Derivatives December 31, 2012December 31, 2011December 31, 2012December 31, 2011 Balance Sheet LocationFairValueBalance Sheet LocationFairValueBalance Sheet LocationFairValueBalance Sheet LocationFairValueDerivatives designated as hedging instruments:        Interest rate contractsOther Assets$197Other Assets$424Other Liabilities$3,332Other Liabilities$2,305Derivatives not designated as hedging instruments:        Interest rate contractsOther Assets$6,103Other Assets$5,241Other Liabilities$6,434Other Liabilities$5,492                                                                                                                           |
| Effect of Derivative Financial Instruments on Income Statement                           | The tables below present the effect of the Corporation’s derivative financial instruments on the Income Statement for the years ended December 31, 2012 and 2011.Derivatives NotDesignated as HedgingInstruments underFASB ASC 815-10Location of Gain(Loss) Recognized inIncome on DerivativeAmount of Gain (Loss)Recognized in Income onDerivative for the Year Ended December 31, 2012Amount of Gain (Loss)Recognized in Income onDerivative for the Year Ended December 31, 2011Interest Rate ContractsOther income$(79)$(94) Derivatives in Cash Flow Hedging RelationshipsAmount of Loss Recognized in Other Comprehensive Income on Derivative (Effective Portion) For the Year Ended Location of Loss Reclassified from Accumulated Other Comprehensive Income (Effective Portion) Amount of Loss Reclassified from Other Comprehensive Income into Income (Effective Portion)For the Year Ended20122011  20122011Interest Rate Products$(1,466)$(3,274) Interest Expense $(217) |

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| - Definition
Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example,  (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.
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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959
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| - Definition
Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.
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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -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.
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