XML 59 R49.htm IDEA: XBRL DOCUMENT
v3.23.1

Loans - Risk Category of Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | $ 3,772,866 |  | $ 3,788,645
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Total | 1,238 | $ 369 |
Commercial and Industrial Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 23,934 |  | 158,088
2022-2021 | 152,250 |  | 123,425
2021-2020 | 109,484 |  | 41,375
2020-2019 | 38,149 |  | 47,887
2019-2018 | 44,561 |  | 20,002
Prior | 68,956 |  | 56,065
Revolving Loans Amortized Cost Basis | 171,536 |  | 173,264
Total | 608,870 |  | 620,106
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
2023 | 0 |  |
2022 | 520 |  |
2021 | 32 |  |
2020 | 30 |  |
2019 | 0 |  |
Prior | 50 |  |
Revolving Loans Amortized Cost Basis | 101 |  |
Total | 733 | 5 |
Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 64,742 |  | 402,613
2022-2021 | 418,921 |  | 496,943
2021-2020 | 495,371 |  | 266,563
2020-2019 | 255,212 |  | 164,251
2019-2018 | 160,499 |  | 143,819
Prior | 571,760 |  | 457,532
Revolving Loans Amortized Cost Basis | 33,732 |  | 35,163
Total | 2,000,237 |  | 1,966,884
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
2023 | 0 |  |
2022 | 0 |  |
2021 | 0 |  |
2020 | 0 |  |
2019 | 0 |  |
Prior | 0 |  |
Revolving Loans Amortized Cost Basis | 0 |  |
Total | 0 | 78 |
Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 12,228 |  | 63,307
2022-2021 | 61,372 |  | 48,734
2021-2020 | 47,000 |  | 54,049
2020-2019 | 52,128 |  | 30,009
2019-2018 | 27,619 |  | 24,168
Prior | 127,307 |  | 108,974
Revolving Loans Amortized Cost Basis | 50,933 |  | 88,172
Total | 378,587 |  | 417,413
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
2023 | 0 |  |
2022 | 0 |  |
2021 | 0 |  |
2020 | 0 |  |
2019 | 0 |  |
Prior | 0 |  |
Revolving Loans Amortized Cost Basis | 0 |  |
Total | 0 | 0 |
Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 8,085 |  | 20,057
2022-2021 | 8,904 |  | 14,461
2021-2020 | 13,392 |  | 9,648
2020-2019 | 18,227 |  | 8,901
2019-2018 | 7,050 |  | 1,851
Prior | 2,778 |  | 1,478
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 58,436 |  | 56,396
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
2023 | 0 |  |
2022 | 0 |  |
2021 | 0 |  |
2020 | 0 |  |
2019 | 0 |  |
Prior | 0 |  |
Revolving Loans Amortized Cost Basis | 0 |  |
Total | 0 | $ 0 |
Pass | Commercial and Industrial Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 23,934 |  | 156,318
2022-2021 | 151,024 |  | 117,648
2021-2020 | 103,507 |  | 39,949
2020-2019 | 36,957 |  | 46,505
2019-2018 | 42,665 |  | 18,423
Prior | 64,882 |  | 51,482
Revolving Loans Amortized Cost Basis | 155,521 |  | 154,203
Total | 578,490 |  | 584,528
Pass | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 64,742 |  | 398,631
2022-2021 | 414,758 |  | 490,747
2021-2020 | 488,827 |  | 261,462
2020-2019 | 249,845 |  | 162,701
2019-2018 | 158,968 |  | 129,151
Prior | 530,615 |  | 427,433
Revolving Loans Amortized Cost Basis | 33,620 |  | 35,163
Total | 1,941,375 |  | 1,905,288
Pass | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 10,620 |  | 62,673
2022-2021 | 61,039 |  | 47,682
2021-2020 | 45,959 |  | 47,355
2020-2019 | 45,512 |  | 25,431
2019-2018 | 24,363 |  | 21,728
Prior | 109,918 |  | 92,344
Revolving Loans Amortized Cost Basis | 47,769 |  | 83,862
Total | 345,180 |  | 381,075
Pass | Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 8,085 |  | 20,057
2022-2021 | 8,904 |  | 14,461
2021-2020 | 13,392 |  | 9,648
2020-2019 | 18,227 |  | 8,901
2019-2018 | 7,050 |  | 1,851
Prior | 2,778 |  | 1,478
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 58,436 |  | 56,396
Special Mention | Commercial and Industrial Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 56
2022-2021 | 55 |  | 148
2021-2020 | 574 |  | 577
2020-2019 | 713 |  | 78
2019-2018 | 673 |  | 551
Prior | 1,649 |  | 2,346
Revolving Loans Amortized Cost Basis | 1,990 |  | 1,672
Total | 5,654 |  | 5,428
Special Mention | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 3,982
2022-2021 | 3,953 |  | 1,568
2021-2020 | 1,413 |  | 4,612
2020-2019 | 4,816 |  | 135
2019-2018 | 133 |  | 13,689
Prior | 35,707 |  | 25,371
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 46,022 |  | 49,357
Special Mention | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 1,608 |  | 634
2022-2021 | 333 |  | 842
2021-2020 | 833 |  | 6,066
2020-2019 | 5,991 |  | 4,149
2019-2018 | 2,837 |  | 2,355
Prior | 12,289 |  | 11,440
Revolving Loans Amortized Cost Basis | 3,139 |  | 4,310
Total | 27,030 |  | 29,796
Special Mention | Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 0
2021-2020 | 0 |  | 0
2020-2019 | 0 |  | 0
2019-2018 | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Substandard | Commercial and Industrial Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 1,714
2022-2021 | 1,171 |  | 5,629
2021-2020 | 5,403 |  | 849
2020-2019 | 479 |  | 1,304
2019-2018 | 1,223 |  | 1,028
Prior | 2,425 |  | 2,237
Revolving Loans Amortized Cost Basis | 14,025 |  | 17,389
Total | 24,726 |  | 30,150
Substandard | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 210 |  | 4,628
2021-2020 | 5,131 |  | 489
2020-2019 | 551 |  | 1,415
2019-2018 | 1,398 |  | 979
Prior | 5,438 |  | 4,728
Revolving Loans Amortized Cost Basis | 112 |  | 0
Total | 12,840 |  | 12,239
Substandard | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 210
2021-2020 | 208 |  | 628
2020-2019 | 625 |  | 429
2019-2018 | 419 |  | 85
Prior | 5,100 |  | 5,190
Revolving Loans Amortized Cost Basis | 25 |  | 0
Total | 6,377 |  | 6,542
Substandard | Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 0
2021-2020 | 0 |  | 0
2020-2019 | 0 |  | 0
2019-2018 | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Doubtful | Commercial and Industrial Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 0
2021-2020 | 0 |  | 0
2020-2019 | 0 |  | 0
2019-2018 | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Doubtful | Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 0
2021-2020 | 0 |  | 0
2020-2019 | 0 |  | 0
2019-2018 | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Doubtful | Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 0
2021-2020 | 0 |  | 0
2020-2019 | 0 |  | 0
2019-2018 | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Doubtful | Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2023-2022 | 0 |  | 0
2022-2021 | 0 |  | 0
2021-2020 | 0 |  | 0
2020-2019 | 0 |  | 0
2019-2018 | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | $ 0 |  | $ 0

X
- Definition Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract
Namespace Prefix: | gabc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff + References No definition available. + Details
Name: | gabc_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | gabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6378536&loc=d3e10095-111533 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=gabc_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=gabc_AgriculturalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=gabc_LeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |