Subsequent Events	12 Months Ended
Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 12, 2018, German American Bancorp entered into a Purchase and Assumption Agreement (the “Purchase Agreement”) with MainSource Bank, a wholly-owned subsidiary of MainSource Financial Group, Inc. (“MainSource”), which provides for the acquisition by German American Bancorp of five MainSource Bank branch locations (four in Columbus, Indiana, and one in Greensburg, Indiana), and certain related assets, and the assumption by German American Bancorp of certain related liabilities. Pursuant to the Purchase Agreement, German American Bancorp has agreed to assume approximately $160 million in deposits and purchase approximately $134 million in loans associated with the five bank branches. German American Bancorp has agreed to pay a purchase price equal to the sum of: (i) 8.0% of the balances of certain checking accounts and other demand withdrawal accounts (excluding governmental accounts with public funds); (ii) 4.5% of the balances of governmental accounts with public funds, excluding time deposits; (iii) 4.5% of the balances of money market and savings deposits, excluding governmental accounts with public funds; (iv) the net book value of all assets, including loans but excluding any accrued interest on such loans; and (v) the accrued interest with respect to purchased loans. The purchase price will be adjusted to reflect increases or decreases in the deposit balances during the six month period following the closing date. Upon written notice, German American Bancorp will also have the ability to put loans back to MainSource Bank during such six month period. The expected premium to be paid for deposits under the Agreement is approximately $8 million. German American Bancorp is also assuming the obligations of MainSource Bank related to certain leases covering the five bank branches. The transaction is expected to close in the second quarter of 2018, subject to regulatory approval, the closing of the previously-announced pending merger of MainSource and First Financial Bancorp, and other customary closing conditions. Effective April 1, 2018, the legal name of German American Bancorp will be changed to German American Bank. The new name corresponds with the trade name already being used by the banking subsidiary and promotes further distinction in nomenclature between the banking subsidiary and the bank holding company, German American Bancorp, Inc.

Subsequent Events

On February 12, 2018, German American Bancorp entered into a Purchase and Assumption Agreement (the “Purchase Agreement”) with MainSource Bank, a wholly-owned subsidiary of MainSource Financial Group, Inc. (“MainSource”), which provides for the acquisition by German American Bancorp of five MainSource Bank branch locations (four in Columbus, Indiana, and one in Greensburg, Indiana), and certain related assets, and the assumption by German American Bancorp of certain related liabilities.

Pursuant to the Purchase Agreement, German American Bancorp has agreed to assume approximately $160 million in deposits and purchase approximately $134 million in loans associated with the five bank branches. German American Bancorp has agreed to pay a purchase price equal to the sum of: (i) 8.0% of the balances of certain checking accounts and other demand withdrawal accounts (excluding governmental accounts with public funds); (ii) 4.5% of the balances of governmental accounts with public funds, excluding time deposits; (iii) 4.5% of the balances of money market and savings deposits, excluding governmental accounts with public funds; (iv) the net book value of all assets, including loans but excluding any accrued interest on such loans; and (v) the accrued interest with respect to purchased loans. The purchase price will be adjusted to reflect increases or decreases in the deposit balances during the six month period following the closing date. Upon written notice, German American Bancorp will also have the ability to put loans back to MainSource Bank during such six month period. The expected premium to be paid for deposits under the Agreement is approximately $8 million. German American Bancorp is also assuming the obligations of MainSource Bank related to certain leases covering the five bank branches.

The transaction is expected to close in the second quarter of 2018, subject to regulatory approval, the closing of the previously-announced pending merger of MainSource and First Financial Bancorp, and other customary closing conditions.

Effective April 1, 2018, the legal name of German American Bancorp will be changed to German American Bank. The new name corresponds with the trade name already being used by the banking subsidiary and promotes further distinction in nomenclature between the banking subsidiary and the bank holding company, German American Bancorp, Inc.