| **Derivative Financial Instruments (Tables)**                                            | 3 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 March 31, 2015, and December 31, 2014.  Asset DerivativesLiability Derivatives March 31, 2015December 31, 2014March 31, 2015December 31, 2014 BalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueBalanceSheetLocationFairValueDerivatives designated as hedging instruments:        Interest rate contractsOther Assets$87Other Assets$137Other Liabilities$3,547Other Liabilities$2,650Derivatives not designated as hedging instruments:        Interest rate contractsOther Assets$4,764Other Assets$3,730Other Liabilities$5,022Other Liabilities$3,887                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance    | The tables below present the effect of the Corporation’s derivative financial instruments on the Income Statement for three months ended March 31, 2015, and 2014. Derivatives Not Designated asHedging Instruments underFASB ASC 815-10Location of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss)Recognized Income onDerivativeAmount of Gain (Loss)Recognized Income onDerivative  Three Months EndedMarch 31, 2015Three Months Ended March 31, 2014Interest rate contractsOther income$(100)$19       The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.Derivatives in Cash Flow Hedging RelationshipsAmount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)Three Months EndedMarch 31, 2015 March 31, 2014Interest Rate Products$(1,276) $(1,266)The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.Location of Loss Reclassified from Accumulated Other Comprehensive Income (Effective Portion)Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)Three Months EndedMarch 31, 2015 March 31, 2014Interest Expense$(354) $(344) |

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| - Definition
Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.
+ References
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=35706170&loc=SL5618551-113959Reference 2: 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=35706170&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.
+ References
Reference 1: 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=35706170&loc=SL5624163-113959
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