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LOANS - Loans Individually Evaluated for Impairment by Portfolio Segment of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 23, 2013 Consumer Real Estate [Member] | Jun. 30, 2012 Consumer Real Estate [Member] | Jun. 30, 2013 Consumer Real Estate [Member] | Jun. 30, 2012 Consumer Real Estate [Member] | Jun. 23, 2013 Agricultural Real Estate [Member] | Jun. 30, 2012 Agricultural Real Estate [Member] | Jun. 30, 2013 Agricultural Real Estate [Member] | Jun. 30, 2012 Agricultural Real Estate [Member] | Jun. 23, 2013 Agricultural [Member] | Jun. 30, 2012 Agricultural [Member] | Jun. 30, 2013 Agricultural [Member] | Jun. 30, 2012 Agricultural [Member] | Jun. 30, 2013 Commercial Real Estate [Member] | Jun. 30, 2012 Commercial Real Estate [Member] | Jun. 30, 2013 Commercial Real Estate [Member] | Jun. 30, 2012 Commercial Real Estate [Member] | Jun. 30, 2013 Commercial and Industrial [Member] | Jun. 30, 2012 Commercial and Industrial [Member] | Jun. 30, 2013 Commercial and Industrial [Member] | Jun. 30, 2012 Commercial and Industrial [Member] | Jun. 30, 2013 Consumer [Member] | Jun. 30, 2012 Consumer [Member] | Jun. 30, 2013 Consumer [Member] | Jun. 30, 2012 Consumer [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Agricultural [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Agricultural [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Agricultural [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Agricultural [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Consumer [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Consumer [Member] | Jun. 30, 2013 With no related allowance recorded [Member] Consumer [Member] | Jun. 30, 2012 With no related allowance recorded [Member] Consumer [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Consumer Real Estate [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Agricultural Real Estate [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Agricultural [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Agricultural [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Agricultural [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Agricultural [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Commercial Real Estate [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Commercial and Industrial [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Consumer [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Consumer [Member] | Jun. 30, 2013 With a specific allowance recorded [Member] Consumer [Member] | Jun. 30, 2012 With a specific allowance recorded [Member] Consumer [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded Investment | $ 470 | $ 738 | $ 470 | $ 738 | $ 88 |  | $ 88 |  |  |  |  |  | $ 1,035 | $ 807 | $ 1,035 | $ 807 | $ 2,928 | $ 2,805 | $ 2,928 | $ 2,805 |  | $ 4 |  | $ 4 | $ 359 | $ 340 | $ 359 | $ 340 |  |  |  |  |  |  |  |  | $ 1,035 | $ 207 | $ 1,035 | $ 207 | $ 309 | $ 364 | $ 309 | $ 364 |  |  |  |  | $ 111 | $ 398 | $ 111 | $ 398 | $ 88 |  | $ 88 |  |  |  |  |  |  | $ 600 |  | $ 600 | $ 2,619 | $ 2,441 | $ 2,619 | $ 2,441 |  | $ 4 |  | $ 4
Unpaid Principal Balance | 542 | 780 | 542 | 780 | 88 |  | 88 |  |  |  |  |  | 1,459 | 1,231 | 1,459 | 1,231 | 2,928 | 2,805 | 2,928 | 2,805 | 3 | 14 | 3 | 14 | 431 | 355 | 431 | 355 |  |  |  |  |  |  |  |  | 1,459 | 384 | 1,459 | 384 | 309 | 364 | 309 | 364 | 3 | 10 | 3 | 10 | 111 | 425 | 111 | 425 | 88 |  | 88 |  |  |  |  |  |  | 847 |  | 847 | 2,619 | 2,441 | 2,619 | 2,441 |  | 4 |  | 4
Related Allowance | 38 | 139 | 38 | 139 | 15 |  | 15 |  |  |  |  |  |  |  |  |  | 718 | 417 | 718 | 417 |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38 | 139 | 38 | 139 | 15 |  | 15 |  |  |  |  |  |  |  |  |  | 718 | 417 | 718 | 417 |  | 1 |  | 1
Average Recorded Investment | 313 | 613 | 252 | 580 | 111 |  | 55 |  |  |  |  |  | 1,053 | 871 | 954 | 890 | 2,968 | 1,284 | 2,998 | 888 |  | 4 |  | 4 | 202 | 213 | 131 | 185 |  |  |  |  |  |  |  |  | 1,038 | 207 | 622 | 207 | 309 | 122 | 297 | 61 |  |  |  |  | 111 | 400 | 121 | 395 | 111 |  | 55 |  |  |  |  |  | 15 | 664 | 332 | 683 | 2,659 | 1,162 | 2,701 | 827 |  | 4 |  | 4
Interest Income Recognized |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  | $ 2 |  |  |  |

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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- Definition Impaired Financing Receivable Recorded Investment During Period + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Impaired Financing Receivable Related Allowance During Period + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Impaired Financing Receivables Interest Income Recognized + References No definition available. + Details
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- Definition Impaired Financing Receivable Unpaid Principal Balance During Period + References No definition available. + Details
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Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
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- Details
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