<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2020-01-31"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="gabc-20210628.xsd" xlink:type="simple"/>
    <context id="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000714395</identifier>
        </entity>
        <period>
            <startDate>2021-06-28</startDate>
            <endDate>2021-06-28</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV80L2ZyYWc6MGE5NzgxN2QyMDcyNGJlOWI5OWNjYWYzN2M4MThmOWYvdGFibGU6YzVmNzQ4YWQ0MTQ4NGFkZDk3YTRhNjVlZjliZTY2ZDIvdGFibGVyYW5nZTpjNWY3NDhhZDQxNDg0YWRkOTdhNGE2NWVmOWJlNjZkMl8yLTEtMS0xLTA_8ea4efca-e5ae-4495-a426-6aee9a639bcd">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV80L2ZyYWc6MGE5NzgxN2QyMDcyNGJlOWI5OWNjYWYzN2M4MThmOWYvdGFibGU6YzVmNzQ4YWQ0MTQ4NGFkZDk3YTRhNjVlZjliZTY2ZDIvdGFibGVyYW5nZTpjNWY3NDhhZDQxNDg0YWRkOTdhNGE2NWVmOWJlNjZkMl8zLTEtMS0xLTA_631ee54d-ce1a-4370-a0e0-3a250cde371b">0000714395</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjkz_1b74a4ed-9ca9-4029-8045-d24968e967a5">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8yNzQ_47a4ae03-c072-4db8-8365-930b0737a419">2021-06-28</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjg5_87f5739f-4ae9-4761-bad2-0022581e8fdc">GERMAN AMERICAN BANCORP, INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjk4_2a86d8f9-3b31-4063-8a9c-7796242d5043">IN</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6MzFmZmMzODEyNGIxNGViZWE5MDhiNjUzMDYxZjA1MTEvdGFibGVyYW5nZTozMWZmYzM4MTI0YjE0ZWJlYTkwOGI2NTMwNjFmMDUxMV8wLTAtMS0xLTA_46f10ae1-5d43-4438-8862-27c05e88562c">001-15877</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6MzFmZmMzODEyNGIxNGViZWE5MDhiNjUzMDYxZjA1MTEvdGFibGVyYW5nZTozMWZmYzM4MTI0YjE0ZWJlYTkwOGI2NTMwNjFmMDUxMV8wLTItMS0xLTA_dc4055d8-b0f4-48f6-9843-7542553acbb5">35-1547518</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6MzFmZmMzODEyNGIxNGViZWE5MDhiNjUzMDYxZjA1MTEvdGFibGVyYW5nZTozMWZmYzM4MTI0YjE0ZWJlYTkwOGI2NTMwNjFmMDUxMV8yLTAtMS0xLTA_cdafcaa3-4e9e-4e70-86af-2c3e8e64ede1">711 Main Street</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6MzFmZmMzODEyNGIxNGViZWE5MDhiNjUzMDYxZjA1MTEvdGFibGVyYW5nZTozMWZmYzM4MTI0YjE0ZWJlYTkwOGI2NTMwNjFmMDUxMV8zLTAtMS0xLTA_7be42bf3-5616-497d-bbe5-10eb4ecb6bc1">Jasper,</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6MzFmZmMzODEyNGIxNGViZWE5MDhiNjUzMDYxZjA1MTEvdGFibGVyYW5nZTozMWZmYzM4MTI0YjE0ZWJlYTkwOGI2NTMwNjFmMDUxMV8zLTEtMS0xLTA_6055369a-310d-4587-8067-d395b6d1fd31">IN</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6MzFmZmMzODEyNGIxNGViZWE5MDhiNjUzMDYxZjA1MTEvdGFibGVyYW5nZTozMWZmYzM4MTI0YjE0ZWJlYTkwOGI2NTMwNjFmMDUxMV8zLTItMS0xLTA_35b3b78e-298a-4b1c-8772-c99bdf7bb232">47546</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjk0_aa1139d3-d335-402b-ae04-64a5214596ac">812</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjkw_aec28be2-9b31-43fd-97f4-7b80713e5152">482-1314</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjk1_8a22efa7-678d-42d5-bfa2-f18ff7f00763">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjk2_53872ce0-9559-4799-a523-dd12fe51d47b">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjkx_d6a4f412-c941-4dc9-a22f-15fefb5b8189">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjky_b301444f-3ed0-43f0-875e-1b5e25a18fa8">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGV4dHJlZ2lvbjo3ZTM1MmJjOTA1MGI0YmEwOGQ4MjcxZjkzZTZmNmIyMV8xNjk3_959d8c38-0beb-4e72-9167-9f95b388d897">false</dei:EntityEmergingGrowthCompany>
    <dei:Security12bTitle
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6YTBiN2M1MzJhYjEwNDRkOGE3OTMxYTkwOTViMGM3ZTcvdGFibGVyYW5nZTphMGI3YzUzMmFiMTA0NGQ4YTc5MzFhOTA5NWIwYzdlN18xLTAtMS0xLTA_15685379-d368-43b0-b917-6404159385bc">Common Stock, no par value</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6YTBiN2M1MzJhYjEwNDRkOGE3OTMxYTkwOTViMGM3ZTcvdGFibGVyYW5nZTphMGI3YzUzMmFiMTA0NGQ4YTc5MzFhOTA5NWIwYzdlN18xLTItMS0xLTA_5614b8fb-cfdc-4d86-ac60-e8f24b483ba1">GABC</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i0dcdbf8c45c04840b6f09b809867a407_D20210628-20210628"
      id="id3VybDovL2RvY3MudjEvZG9jOjZkNGI3YTYyYjczODQ0NGE5NzE1NzMzOWQ3OGEwNjUxL3NlYzo2ZDRiN2E2MmI3Mzg0NDRhOTcxNTczMzlkNzhhMDY1MV8xL2ZyYWc6N2UzNTJiYzkwNTBiNGJhMDhkODI3MWY5M2U2ZjZiMjEvdGFibGU6YTBiN2M1MzJhYjEwNDRkOGE3OTMxYTkwOTViMGM3ZTcvdGFibGVyYW5nZTphMGI3YzUzMmFiMTA0NGQ4YTc5MzFhOTA5NWIwYzdlN18xLTQtMS0xLTA_99e99670-5e57-4d45-ab53-e5626d92fe67">NASDAQ</dei:SecurityExchangeName>
</xbrl>
