Basis of Presentation (Policies)	9 Months Ended
Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is determined using net income available to common stockholders and weighted average common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average common shares and assumed incremental common shares issued.
Effect of New Financial Accounting Standards	Effect of New Financial Accounting Standards In July 2013, the FASB issued ASU No. 2013-11, "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists," to eliminate the diversity in practice and to increase the comparability of financial statements among companies. The guidance requires that a reporting entity generally must show an unrecognized tax benefit, or a portion of an unrecognized tax benefit, for a net operating loss carryforward, similar tax loss or a tax credit carryforward as a reduction of a deferred tax asset. However, the entity should present the unrecognized tax benefit as a liability and not as a reduction of a deferred tax asset if the carryforward or tax loss is not available on the financial statement date to settle any additional income tax liability that would result from the disallowance of the tax position under the applicable tax law, or the applicable tax law does not require the company to use, and the company does not intend to use, the carryforward or tax loss to settle additional income taxes resulting from the disallowance of the tax position. The guidance does not require any new recurring disclosures because it does not affect the recognition or measurement of uncertain tax positions. Heartland adopted this standard on January 1, 2014, and the adoption did not have a material impact on the results of operations, financial position, and liquidity. In January 2014, the FASB issued ASU 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects." The amendments in ASU 2014-01 to Topic 323, "Equity Investments and Joint Ventures," provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The amendments permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing 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 are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014, and should be applied retrospectively to all periods presented. Early adoption is permitted. Heartland is in the process of evaluating the impact that adoption of this guidance will have on the results of operations, financial position, and liquidity. In January 2014, the FASB issued ASU 2014-04, "Receivables-Troubled Debt Restructurings by Creditors: Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure." The amendments in ASU 2014-04 clarify that an in-substance foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in loans collateralized by residential real estate property that are in the process of foreclosure. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2014, with early adoption permitted. Once adopted, an entity can elect either (i) a modified retrospective transition method or (ii) a prospective transition method. The modified retrospective transition method is applied by means of a cumulative-effect adjustment to residential mortgage loans and foreclosed residential real estate properties existing as of the beginning of the period for which the amendments of ASU 2014-04 are effective, with real estate reclassified to loans measured at the carrying value of the real estate at the date of adoption and loans reclassified to real estate measured at the lower of net carrying value of the loan or the fair value of the real estate less costs to sell at the date of adoption. The prospective transition method is applied by means of applying the amendments of ASU 2014-04 to all instances of receiving physical possession of residential real estate properties that occur after the date of adoption. Heartland does not expect the adoption of this standard to have a material impact on the results of operations, financial position, and liquidity. In August 2014, the FASB issued ASU 2014-14, "Receivables-Troubled Debt Restructurings by Creditors: Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure." The amendment clarifies how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. The amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure, and (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 the 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 on the amount of the loan balance (principal and interest) expected to be recovered for the guarantor. This amendment is effective for annual reporting periods, and interim reporting periods within those years, beginning after December 15, 2014, with early adoption permitted. Heartland does not expect the adoption of this standard to have a material impact on the results of operations, financial position, and liquidity.

Effect of New Financial Accounting Standards

In July 2013, the FASB issued ASU No. 2013-11, "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists," to eliminate the diversity in practice and to increase the comparability of financial statements among companies. The guidance requires that a reporting entity generally must show an unrecognized tax benefit, or a portion of an unrecognized tax benefit, for a net operating loss carryforward, similar tax loss or a tax credit carryforward as a reduction of a deferred tax asset. However, the entity should present the unrecognized tax benefit as a liability and not as a reduction of a deferred tax asset if the carryforward or tax loss is not available on the financial statement date to settle any additional income tax liability that would result from the disallowance of the tax position under the applicable tax law, or the applicable tax law does not require the company to use, and the company does not intend to use, the carryforward or tax loss to settle additional income taxes resulting from the disallowance of the tax position. The guidance does not require any new recurring disclosures because it does not affect the recognition or measurement of uncertain tax positions. Heartland adopted this standard on January 1, 2014, and the adoption did not have a material impact on the results of operations, financial position, and liquidity.

In January 2014, the FASB issued ASU 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects." The amendments in ASU 2014-01 to Topic 323, "Equity Investments and Joint Ventures," provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The amendments permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing 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 are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014, and should be applied retrospectively to all periods presented. Early adoption is permitted. Heartland is in the process of evaluating the impact that adoption of this guidance will have on the results of operations, financial position, and liquidity.

In January 2014, the FASB issued ASU 2014-04, "Receivables-Troubled Debt Restructurings by Creditors: Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure." The amendments in ASU 2014-04 clarify that an in-substance foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in loans collateralized by residential real estate property that are in the process of foreclosure. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2014, with early adoption permitted. Once adopted, an entity can elect either (i) a modified retrospective transition method or (ii) a prospective transition method. The modified retrospective transition method is applied by means of a cumulative-effect adjustment to residential mortgage loans and foreclosed residential real estate properties existing as of the beginning of the period for which the amendments of ASU 2014-04 are effective, with real estate reclassified to loans measured at the carrying value of the real estate at the date of adoption and loans reclassified to real estate measured at the lower of net carrying value of the loan or the fair value of the real estate less costs to sell at the date of adoption. The prospective transition method is applied by means of applying the amendments of ASU 2014-04 to all instances of receiving physical possession of residential real estate properties that occur after the date of adoption. Heartland does not expect the adoption of this standard to have a material impact on the results of operations, financial position, and liquidity.

In August 2014, the FASB issued ASU 2014-14, "Receivables-Troubled Debt Restructurings by Creditors: Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure." The amendment clarifies how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. The amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure, and (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 the 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 on the amount of the loan balance (principal and interest) expected to be recovered for the guarantor. This amendment is effective for annual reporting periods, and interim reporting periods within those years, beginning after December 15, 2014, with early adoption permitted. Heartland does not expect the adoption of this standard to have a material impact on the results of operations, financial position, and liquidity.