Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]
Investment policy on municipal securities [Policy Text Block]	The Corporation's investment policy states that municipal securities purchased are to be investment grade and allows for a 20% maximum portfolio concentration in municipal securities with a combined individual state to total municipal outstanding equal to or less than 25%.
New Accounting Pronouncements and Changes in Accounting Principles	Recently Adopted Accounting Standards FASB ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The amendments in ASU 2014-01 do not change the existing accounting methods, but permit reporting entities to make an accounting policy election to account for their investments in qualified affordable projects using the proportional amortization method, if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments in ASU 2014-01 are effective for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014, and should be applied retrospectively to all periods presented. The Corporation early adopted ASU 2014-01 in the first quarter of 2014. Amortization of the initial investment cost of qualifying projects is now recorded in the provision for income taxes together with the tax credits and benefits received. Previously, the amortization was recorded as other noninterest expense. All prior period amounts have been restated to reflect the adoption of the amendment, which resulted in an offsetting decrease to other noninterest expense and increase to the provision for income taxes of approximately $0.8 million and $2.3 million for the three and nine months ended September 30, 2013, respectively. Recently Issued Accounting Standards FASB ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure—a consensus of the FASB Emerging Issues Task Force. The objective of this update is to reduce diversity in practice by addressing the classification of certain foreclosed mortgage loans held by creditors that are either fully or partially guaranteed under government programs. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: 1) the loan has a government guarantee that is not separable from the loan before foreclosure; 2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and 3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The ASU is effective for interim and annual periods beginning after December 15, 2014. The amendments can be adopted using either a prospective transition method or a modified retrospective transition method. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations. FASB ASU 2014–12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period — a consensus of the FASB Emerging Issues Task Force. The amendments in this update clarify that entities should treat performance targets that can be met after the requisite service period of a share-based payment award as performance conditions that affect vesting. Therefore, an entity would not record compensation expense (measured as of the grant date without taking into account the effect of the performance target) related to an award for which transfer to the employee is contingent on the entity’s satisfaction of a performance target until it becomes probable that the performance target will be met. The ASU does not contain any new disclosure requirements. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. In addition, entities will have the option of applying the guidance either prospectively (i.e., only to awards granted or modified on or after the effective date) or retrospectively. Retrospective application would only apply to awards with performance targets outstanding at or after the beginning of the first annual period presented (i.e., the earliest presented comparative period). The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements. FASB ASU 2014-11, Transfers and Servicing: Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this update require entities to account for repurchase-to-maturity transactions as secured borrowings (rather than as sales with forward repurchase agreements), eliminate accounting guidance on linking repurchase financing transactions, and expand disclosure requirements related to certain transfers of financial assets that are accounted for as sales and certain transfers, such as repos, securities lending transactions, and repurchase-to-maturity transactions, accounted for as secured borrowings. The amendments in ASU 2014-11 are effective for the first interim or annual period beginning after December 15, 2014. The amendments must present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Early application is prohibited. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations. FASB ASU 2014-09, Revenue from Contracts with Customers. The amendments in this update supersede virtually all existing GAAP revenue recognition guidance, including most industry-specific revenue recognition guidance. ASU 2014-09 creates a single, principle-based revenue recognition framework and will require entities to apply significantly more judgment and expanded disclosures surrounding revenue recognition. The core principle requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 applies to contracts with customers to provide goods and services, with certain exclusions such as lease contracts, financing arrangements, and financial instruments. The amendments in ASU 2014-09 are effective for fiscal years beginning after December 15, 2016. The amendments can be adopted using either the full retrospective approach or a modified retrospective approach. Early adoption is prohibited. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements. FASB ASU 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update change the definition of a discontinued operation in ASC 205-20 and require additional disclosures for transactions that meet the definition of a discontinued operation and certain other significant transactions that do not meet the discontinued operations criteria. The amendments in ASU 2014-08 are effective prospectively for all disposals, except disposals classified as held for sale before the adoption date or components initially classified as held for sale in periods beginning on or after December 15, 2014, with early adoption permitted. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations. FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 amends the guidance in ASC 310-40 by clarifying when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan. Additionally, the amendments require interim and annual disclosure of both 1) the amount of foreclosed residential real estate property held by the creditor and 2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in ASU 2014-04 are effective for annual periods, and interim period within those annual periods, beginning after December 15, 2014. The amendments can either be adopted using a modified retrospective or a prospective transition method. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.

Recently Adopted Accounting Standards

FASB ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The amendments in ASU 2014-01 do not change the existing accounting methods, but permit reporting entities to make an accounting policy election to account for their investments in qualified affordable projects using the proportional amortization method, if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments in ASU 2014-01 are effective for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014, and should be applied retrospectively to all periods presented. The Corporation early adopted ASU 2014-01 in the first quarter of 2014. Amortization of the initial investment cost of qualifying projects is now recorded in the provision for income taxes together with the tax credits and benefits received. Previously, the amortization was recorded as other noninterest expense. All prior period amounts have been restated to reflect the adoption of the amendment, which resulted in an offsetting decrease to other noninterest expense and increase to the provision for income taxes of approximately $0.8 million and $2.3 million for the three and nine months ended September 30, 2013, respectively.

Recently Issued Accounting Standards

FASB ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure—a consensus of the FASB Emerging Issues Task Force. The objective of this update is to reduce diversity in practice by addressing the classification of certain foreclosed mortgage loans held by creditors that are either fully or partially guaranteed under government programs. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the

following conditions are met: 1) the loan has a government guarantee that is not separable from the

loan before foreclosure; 2) at the time of foreclosure, the creditor has the intent to convey the real

estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and 3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The ASU is effective for interim and annual periods beginning after December 15, 2014. The amendments can be adopted using either a prospective transition method or a modified retrospective transition method. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.

FASB ASU 2014–12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period — a consensus of the FASB Emerging Issues Task Force. The amendments in this update clarify that entities should treat performance targets that can be met after the requisite service period of a share-based payment award as performance conditions that affect vesting. Therefore, an entity would not record compensation expense (measured as of the grant date without taking into account the effect of the performance target) related to an award for which transfer to the employee is contingent on the entity’s satisfaction of a performance target until it becomes probable that the performance target will be met. The ASU does not contain any new disclosure requirements. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. In addition, entities will have the option of applying the guidance either prospectively (i.e., only to awards granted or modified on or after the effective date) or retrospectively. Retrospective application would only apply to awards with performance targets outstanding at or after the beginning of the first annual period presented (i.e., the earliest presented comparative period). The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.

FASB ASU 2014-11, Transfers and Servicing: Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this update require entities to account for repurchase-to-maturity transactions as secured borrowings (rather than as sales with forward repurchase agreements), eliminate accounting guidance on linking repurchase financing transactions, and expand disclosure requirements related to certain transfers of financial assets that are accounted for as sales and certain transfers, such as repos, securities lending transactions, and repurchase-to-maturity transactions, accounted for as secured borrowings. The amendments in ASU 2014-11 are effective for the first interim or annual period beginning after December 15, 2014. The amendments must present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Early application is prohibited. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.

FASB ASU 2014-09, Revenue from Contracts with Customers. The amendments in this update supersede virtually all existing GAAP revenue recognition guidance, including most industry-specific revenue recognition guidance. ASU 2014-09 creates a single, principle-based revenue recognition framework and will require entities to apply significantly more judgment and expanded disclosures surrounding revenue recognition. The core principle requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 applies to contracts with customers to provide goods and services, with certain exclusions such as lease contracts, financing arrangements, and financial instruments. The amendments in ASU 2014-09 are effective for fiscal years beginning after December 15, 2016. The amendments can be adopted using either the full retrospective approach or a modified retrospective approach. Early adoption is prohibited. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.

FASB ASU 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update change the definition of a discontinued operation in ASC 205-20 and require additional disclosures for transactions that meet the definition of a discontinued operation and certain other significant transactions that do not meet the discontinued operations criteria. The amendments in ASU 2014-08 are effective prospectively for all disposals, except disposals classified as held for sale before the adoption date or components initially classified as held for sale in periods beginning on or after December 15, 2014, with early adoption permitted. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.

FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 amends the guidance in ASC 310-40 by clarifying when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan. Additionally, the amendments require interim and annual disclosure of both 1) the amount of foreclosed residential real estate property held by the creditor and 2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in ASU 2014-04 are effective for annual periods, and interim period within those annual periods, beginning after December 15, 2014. The amendments can either be adopted using a modified retrospective or a prospective transition method. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.