Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2013
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted and Issued Accounting Standards FASB ASU 2011-11, Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 amends the guidance in ASC 210, Balance Sheet, to require an entity to disclose information about offsetting and related arrangements to enable users of an entity's financial statements to evaluate the effect or potential effect of netting arrangements. The amendments are effective for annual reporting periods beginning on or after January 1, 2013, with retrospective application to the disclosures of all comparative periods presented. ASU 2011-11 did not have a significant impact on the corporations derivatives, repurchase agreements, reverse repurchase agreements, and securities lending and borrowing transactions on the consolidated financial statements. The newly required disclosures are incorporated into Note 9 (Derivatives and Hedging Activities). FASB ASU 2012-06, Business Combinations: Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution (a consensus of the FASB Emerging Issues Task Force). ASU 2012-06 amends the guidance in ASU 805-20 on the recognition of an indemnification asset as a result of a government-assisted acquisition of a financial institution when a subsequent change in the cash flows expected to be collected on the indemnification asset occurs (as a result of a change in cash flows expected to be collected on the assets subject to indemnification). A subsequent change in the measurement of the indemnification asset is to be accounted for on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value are limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The amendments in ASU 2012-06 are effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2012. The Corporation currently applies the accounting as described within ASU 2012-06; therefore, ASU 2012-06 will not have an impact on its consolidated financial statements. FASB ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 amends the guidance on ASC 220-10, by requiring an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. The objective of the update is to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments in ASU 2013-02 are effective prospectively for reporting periods beginning after December 15, 2012. The Corporation has incorporated this new disclosure information into Note 14 (Changes and Reclassifications Out of Accumulated Other Comprehensive Income).

Recently Adopted and Issued Accounting Standards

FASB ASU 2011-11, Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 amends the guidance in ASC 210, Balance Sheet, to require an entity to disclose information about offsetting and related arrangements to enable users of an entity's financial statements to evaluate the effect or potential effect of netting arrangements. The amendments are effective for annual reporting periods beginning on or after January 1, 2013, with retrospective application to the disclosures of all comparative periods presented. ASU 2011-11 did not have a significant impact on the corporations derivatives, repurchase agreements, reverse repurchase agreements, and securities lending and borrowing transactions on the consolidated financial statements. The newly required disclosures are incorporated into Note 9 (Derivatives and Hedging Activities).

FASB ASU 2012-06, Business Combinations: Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution (a consensus of the FASB Emerging Issues Task Force). ASU 2012-06 amends the guidance in ASU 805-20 on the recognition of an indemnification asset as a result of a government-assisted acquisition of a financial institution when a subsequent change in the cash flows expected to be collected on the indemnification asset occurs (as a result of a change in cash flows expected to be collected on the assets subject to indemnification). A subsequent change in the measurement of the indemnification asset is to be accounted for on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value are limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The amendments in ASU 2012-06 are effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2012. The Corporation currently applies the accounting as described within ASU 2012-06; therefore, ASU 2012-06 will not have an impact on its consolidated financial statements.

FASB ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 amends the guidance on ASC 220-10, by requiring an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. The objective of the update is to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments in ASU 2013-02 are effective prospectively for reporting periods beginning after December 15, 2012. The Corporation has incorporated this new disclosure information into Note 14 (Changes and Reclassifications Out of Accumulated Other Comprehensive Income).