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Asset Purchases - Amortization Expense of Core Deposit Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015
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Business Acquisition [Line Items] |
2015 | $ 323 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 | 322 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 | 245 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 | 167 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 | 167 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter | 161 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total | 1,385 us-gaap_FiniteLivedIntangibleAssetsNet
Hicksville [Member] |
Business Acquisition [Line Items] |
2015 | 155 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_BusinessAcquisitionAxis = fmao_HicksvilleMember
2016 | 155 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_BusinessAcquisitionAxis = fmao_HicksvilleMember
2017 | 78 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_BusinessAcquisitionAxis = fmao_HicksvilleMember
Total | 388 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = fmao_HicksvilleMember
Custar [Member] |
Business Acquisition [Line Items] |
2015 | 168 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember
2016 | 167 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember
2017 | 167 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember
2018 | 167 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember
2019 | 167 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember
Thereafter | 161 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember
Total | $ 997 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = fmao_CustarMember

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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