XML 27 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value of Instruments - Changes in the Level 3 Fair Value Category of Unobservable Inputs (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 State and local governments [Member] | Dec. 31, 2013 State and local governments [Member] | Sep. 30, 2014 Level 3 [Member] | Dec. 31, 2013 Level 3 [Member] | Sep. 30, 2014 Level 3 [Member] State and local governments [Member] | Sep. 30, 2013 Level 3 [Member] State and local governments [Member] | Sep. 30, 2014 Level 3 [Member] State and local governments [Member] Tax - Exempt [Member] | Sep. 30, 2013 Level 3 [Member] State and local governments [Member] Tax - Exempt [Member] | Sep. 30, 2014 Level 3 [Member] State and local governments [Member] Taxable [Member] | Sep. 30, 2013 Level 3 [Member] State and local governments [Member] Taxable [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 324,509 |  | $ 77,748 | $ 81,473 | $ 7,907 | $ 10,346 | $ 10,346 | $ 16,408 | $ 8,802 | $ 14,863 | $ 1,544 | $ 1,545
Change in Market Value |  |  |  |  |  |  | (1,619) | (497) | (1,262) | (497) | (357) | 0
Purchases | 0 | 83,310 |  |  |  |  |  | 519 |  | 519 |  | 0
Payments & Maturities |  |  |  |  |  |  | (820) | (4,388) | (820) | (4,388) | 0 | 0
Ending Balance | $ 253,119 |  | $ 77,748 | $ 81,473 | $ 7,907 | $ 10,346 | $ 7,907 | $ 12,042 | $ 6,720 | $ 10,497 | $ 1,187 | $ 1,545

X
- Definition Net change in fair market value of available for sale securities. + References No definition available. + Details
Name: | fmao_NetChangeInFairMarketValueOfAvailableForSaleSecurities
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments and maturities of available for sale securities. + References No definition available. + Details
Name: | fmao_PaymentsAndMaturitiesOfAvailableForSaleSecurities
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration