Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2015
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation German American Bancorp, Inc's. operations are primarily comprised of three business segments: core banking, trust and investment advisory services, and insurance operations. The accounting and reporting policies of German American Bancorp, Inc. and its subsidiaries conform to U.S. generally accepted accounting principles. The more significant policies are described below. The consolidated financial statements include the accounts of the Company and its subsidiaries after elimination of all material intercompany accounts and transactions. Certain prior year amounts have been reclassified to conform with current classifications. Reclassifications had no impact on shareholders' equity or net income. To prepare financial statements in conformity with accounting principles generally accepted in the United States of America management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ.
Securities	Securities Securities classified as available-for-sale are securities that the Company intends to hold for an indefinite period of time, but not necessarily until maturity. These include securities that management may use as part of its asset/liability strategy, or that may be sold in response to changes in interest rates, changes in prepayment risk, or similar reasons. Equity securities with readily determinable fair values are classified as available-for-sale. Equity securities that do not have readily determinable fair values are carried at historical cost and evaluated for impairment on a periodic basis. Securities classified as available-for-sale are reported at fair value with unrealized gains or losses included as a separate component of equity, net of tax. Securities classified as held-to-maturity are securities that the Company has both the ability and positive intent to hold to maturity. Securities held-to-maturity are carried at amortized cost. Premium amortization is deducted from, and discount accretion is added to, interest income using the level yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses on sales are recorded on trade date and are computed on the identified securities method. Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized through earnings.
Loans Held for Sale	Loans Held for Sale Mortgage loans originated and intended for sale in the secondary market are carried at fair value. Fair value is determined based on collateral value and prevailing market prices for loans with similar characteristics. Net unrealized gains or losses are recorded through earnings. Mortgage loans held for sale are generally sold on a servicing released basis. Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related loan sold.
Loans	Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at the principal balance outstanding, net of unearned interest, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on unpaid principal balance and includes amortization of net deferred loan fees and costs over the loan term without anticipating prepayments. All classes of loans are generally placed on non-accrual status when scheduled principal or interest payments are past due for 90 days or more or when the borrower’s ability to repay becomes doubtful. Uncollected accrued interest for each class of loans is reversed against income at the time a loan is placed on non-accrual. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. All classes of loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Loans are typically charged-off at 180 days past due, or earlier if deemed uncollectible. Exceptions to the non-accrual and charge-off policies are made when the loan is well secured and in the process of collection.
Certain Purchased Loans	Certain Purchased Loans The Company purchases individual loans and groups of loans. Purchased loans that show evidence of credit deterioration since origination are recorded at the amount paid (or allocated fair value in a purchase business combination), such that there is no carryover of the seller’s allowance for loan losses. After acquisition, incurred losses are recognized by an increase in the allowance for loan losses. Such purchased loans are accounted for individually. The Company estimates the amount and timing of expected cash flows for each purchased loan or pool, and the expected cash flows in excess of amount paid is recorded as interest income over the remaining life of the loan or pool (accretable yield). The excess of the loan’s or pool’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded. If the present value of expected cash flows is greater than the carrying amount, it is recognized as part of future interest income.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged-off. The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired or loans otherwise classified as substandard or special mention. The general component covers non-classified loans and is based on historical loss experience adjusted for current factors. Loan impairment is reported when full repayment under the terms of the loan is not expected. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported net, at the present value of estimated future cash flows using the loan’s existing rate, or at the fair value of collateral if repayment is expected solely from the collateral. Commercial and industrial loans, commercial real estate loans, and agricultural loans are evaluated individually for impairment. Smaller balance homogeneous loans are evaluated for impairment in total. Such loans include real estate loans secured by one-to-four family residences and loans to individuals for household, family and other personal expenditures. Individually evaluated loans on non-accrual are generally considered impaired. Impaired loans, or portions thereof, are charged off when deemed uncollectible. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and risk classifications and is based on the actual loss history experienced by the Company over a 20 quarter average. The Company assigns allocations for substandard and special mention commercial and agricultural credits as well as other categories of loans based on migration analysis techniques. This actual loss experience is supplemented with other external and internal factors based on the risks present for each portfolio segment. These factors include consideration of the following: levels of and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The following portfolio segments have been identified: Commercial Loans and Retail Loans. Commercial Loans have been classified according to the following risk characteristics: Commercial and Industrial Loans and Leases, Commercial Real Estate, and Agricultural Loans. Commercial and Industrial loans are primarily based on the cash flows of the business operations and secured by assets being financed and other assets such as accounts receivable and inventory. Commercial Real Estate Loans and Agricultural Loans are primarily based on cash flow of the borrower and their business and further secured by real estate. All types of commercial and agricultural (real estate secured and non-real estate) may also come with personal guarantees of the borrowers and business owners. Retail Loans have been classified according to the following risk characteristics: Home Equity Loans, Consumer Loans and Residential Mortgage Loans. Retail loans are generally dependent on personal income of the customer, and repayment is dependent on borrower’s personal cash flow and employment status which can be affected by general economic conditions. Additionally, collateral values may fluctuate based on the impact of economic conditions on residential real estate values and other consumer type assets such as automobiles. Loans or portions of loans shall be charged off when there is a distinct probability of loss identified. A distinct probability of loss exists when it has been determined that any remaining sources of repayment are insufficient to cover all outstanding principal. The probable loss is immediately calculated based on the value of the remaining sources of repayment and charged to the allowance for loan loss.
Federal Home Loan Bank (FHLB) Stock	Federal Home Loan Bank (FHLB) Stock The Bank is a member of the FHLB of Indianapolis. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Premises, Furniture and Equipment	Premises, Furniture and Equipment Land is carried at cost. Premises, furniture, and equipment are stated at cost less accumulated depreciation. Buildings and related components are depreciated using the straight-line method with useful lives ranging generally from 10 to 40 years. Furniture, fixtures, and equipment are depreciated using the straight-line method with useful lives ranging generally from 3 to 10 years.
Other Real Estate	Other Real Estate Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill resulting from business combinations prior to January 1, 2009 represents the excess of the purchase price over the fair value of the net assets of businesses acquired. Goodwill resulting from business combinations after January 1, 2009, is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually. The Company has selected December 31 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet. Other intangible assets consist of core deposit and acquired customer relationship intangible assets. They are initially measured at fair value and then are amortized over their estimated useful lives, which range from 6 to 10 years.
Company Owned Life Insurance	Company Owned Life Insurance The Company has purchased life insurance policies on certain directors and executives. This life insurance is recorded at its cash surrender value or the amount that can be realized, which considers any adjustments or changes that are probable at settlement.
Loss Contingencies	Loss Contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe currently that there are any such matters that will have a material impact on the financial statements.
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Restrictions on Cash	Restrictions on Cash At December 31, 2015 and 2014, respectively, the Company was required to have $8,262 and $7,273 on deposit with the Federal Reserve, or as cash on hand.
Long-term Assets	Long-term Assets Premises and equipment, core deposit and other intangible assets, and other long-term assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Stock Based Compensation	Stock Based Compensation Compensation cost is recognized for stock options and restricted stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Corporation’s common stock at the date of grant is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale and changes in unrecognized amounts in pension and other postretirement benefits, which are also recognized as a separate component of equity.
Income Taxes	Income Taxes Income tax is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax liabilities and assets are determined at each balance sheet date and are the result of differences in the financial statement and tax bases of assets and liabilities. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
Retirement Plans	Retirement Plans Pension expense under the suspended defined benefit plan is the net of interest cost, return on plan assets and amortization of gains and losses not immediately recognized. Employee 401(k) and profit sharing plan expense is the amount of matching contributions. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
Earnings Per Share	Earnings Per Share Earnings per share are based on net income divided by the weighted average number of shares outstanding during the period. Diluted earnings per share show the potential dilutive effect of additional common shares issuable under the Company’s stock based compensation plans. Earnings per share are retroactively restated for stock dividends.
Cash Flow Reporting	Cash Flow Reporting The Company reports net cash flows for customer loan transactions, deposit transactions, deposits made with other financial institutions and short-term borrowings. Cash and cash equivalents are defined to include cash on hand, demand deposits in other institutions and Federal Funds Sold.
Fair Values of Financial Instruments	Fair Values of Financial Instruments Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 14. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates.
New Accounting Pronouncements	New Accounting Pronouncements In January 2014, the FASB amended existing guidance (ASU No. 2014-4, Receivables -Troubled Debt Restructurings by Creditors (Subtopic 310-40) - Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure) clarifying that 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, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. 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 this update are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. This update did not have a material impact on the Company's consolidated financial statements. In January 2014, the FASB amended existing guidance (ASU No. 2014-1, Investments-Equity Method and Joint Ventures (Topic 323) - Accounting for Investments in Qualified Affordable Housing Projects) to eliminate the effective yield election and to permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional method if certain conditions are met. The amendments are effective for the Company for annual periods and interim reporting periods beginning after December 15, 2014. The Company adopted the proportional amortization method of accounting for its low income housing investments in the first quarter of 2015. The Company determined that the adoption of the proportional amortization method did not have a material impact to its consolidated financial statements; therefore, the Company did not adjust its prior period consolidated financial statements. The impact of the adoption was $161 and is included in the income tax line of the Consolidated Statements of Income. In May 2014, the FASB amended existing guidance (ASU No. 2014-09 Revenue From Contracts With Customers (Topic 606)) related to revenue from contracts with customers. This amendment supersedes and replaces nearly all existing revenue recognition guidance, including industry-specific guidance, establishes a new control-based revenue recognition model, changes the basis for deciding when revenue is recognized over time or at a point in time, provides new and more detailed guidance on specific topics and expands and improves disclosures about revenue. In addition, this amendment specifies the accounting for some costs to obtain or fulfill a contract with a customer. These amendments are effective for annual reporting periods beginning after December 15, 2017. The Company is currently evaluating the impact of this new accounting standard on the Company's consolidated results of operations and financial condition. In January 2016, the FASB amended existing guidance (ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities). The amendments in this update are as follows: (1) Require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. (2) Simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. (3) Eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. (4) Require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. (5) Require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. (6) Require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. (7) Clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. These amendments are effective for annual reporting periods and interim periods within those annual reporting periods beginning after December 15, 2017. The Company is currently evaluating the impact of this new accounting standard on the Company's consolidated financial statements.