Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Investment Securities Available-for-Sale [Abstract]
Fair/Book Value, Total	$ 365,184us-gaap_AvailableForSaleSecurities	$ 366,542us-gaap_AvailableForSaleSecurities	$ 399,743us-gaap_AvailableForSaleSecurities
Investment Securities Held-to-Maturity [Abstract]
Fair Value	64,218	64,635	66,109
Carrying Amount [Member]
Assets [Abstract]
Cash and Cash Equivalents	143,936	77,125	173,727
Investment Securities Available-for-Sale [Abstract]
Government Agency & Government-Sponsored Entities	68,132	78,109	18,426
US Treasury Notes	19,966
Mortgage Backed Securities	276,601	287,948	329,730
Corporate Securities			49,352
Other	485	485	2,235
Fair/Book Value, Total	365,184	366,542	399,743
Investment Securities Held-to-Maturity [Abstract]
Obligations of States and Political Subdivisions	61,324	61,716	62,890
Mortgage Backed Securities			4
Other	2,139	2,147	2,761
Fair Value	63,463	63,863	65,655
FHLB Stock	7,677	7,677	7,187
Loans & Leases, Net of Deferred Fees & Allowance [Abstract]
Commercial Real Estate	521,596	484,061	396,439
Agricultural Real Estate	344,965	353,022	322,725
Real Estate Construction	99,700	94,850	54,674
Residential 1st Mortgages	181,758	170,858	154,994
Home Equity Lines and Loans	29,628	30,591	31,641
Agricultural	211,629	275,859	199,627
Commercial	227,200	222,624	149,376
Consumer & Other	4,703	4,501	4,550
Leases	48,347	42,006	17,247
Unallocated Allowance	(3,146)	(1,529)	(2,520)
Total Loans & Leases, Net of Deferred Fees & Allowance	1,666,380	1,676,843	1,328,753
Accrued Interest Receivable	7,324	7,797	6,732
Deposits [Abstract]
Demand	578,820	610,133	489,786
Interest Bearing Transaction	340,045	341,397	287,174
Savings and Money Market	699,308	644,260	639,370
Time	493,600	468,283	424,284
Total Deposits	2,111,773	2,064,073	1,840,614
Subordinated Debentures	10,310	10,310	10,310
Accrued Interest Payable	433	378	345
Estimated Fair Value [Member]
Assets [Abstract]
Cash and Cash Equivalents	143,936	77,125	173,727
Investment Securities Available-for-Sale [Abstract]
Government Agency & Government-Sponsored Entities	68,132	78,109	18,426
US Treasury Notes	19,966
Mortgage Backed Securities	276,601	287,948	329,730
Corporate Securities			49,352
Other	485	485	2,235
Fair/Book Value, Total	365,184	366,542	399,743
Investment Securities Held-to-Maturity [Abstract]
Obligations of States and Political Subdivisions	62,079	62,488	63,344
Mortgage Backed Securities			4
Other	2,139	2,147	2,761
Fair Value	64,218	64,635	66,109
Loans & Leases, Net of Deferred Fees & Allowance [Abstract]
Commercial Real Estate	519,698	481,037	397,090
Agricultural Real Estate	346,742	353,288	326,210
Real Estate Construction	99,861	95,022	55,040
Residential 1st Mortgages	185,210	173,916	157,714
Home Equity Lines and Loans	31,332	32,456	33,994
Agricultural	210,769	274,195	198,836
Commercial	224,783	222,175	149,450
Consumer & Other	4,747	4,535	4,599
Leases	48,779	40,298	17,080
Unallocated Allowance	(3,146)	(1,529)	(2,520)
Total Loans & Leases, Net of Deferred Fees & Allowance	1,668,775	1,675,393	1,337,493
Accrued Interest Receivable	7,324	7,797	6,732
Deposits [Abstract]
Demand	578,820	610,133	489,786
Interest Bearing Transaction	340,045	341,397	287,174
Savings and Money Market	699,308	644,260	639,370
Time	493,600	468,161	424,568
Total Deposits	2,111,773	2,063,951	1,840,898
Subordinated Debentures	6,250	6,227	6,220
Accrued Interest Payable	433	378	345
Estimated Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and Cash Equivalents	143,936	77,125	173,727
Investment Securities Available-for-Sale [Abstract]
Government Agency & Government-Sponsored Entities	0	10,005	13,399
US Treasury Notes	0
Mortgage Backed Securities	0	0	0
Corporate Securities			7,966
Other	175	175	1,925
Fair/Book Value, Total	175	10,180	23,290
Investment Securities Held-to-Maturity [Abstract]
Obligations of States and Political Subdivisions	0	0	0
Mortgage Backed Securities			0
Other	0	0	0
Fair Value	0	0	0
Loans & Leases, Net of Deferred Fees & Allowance [Abstract]
Commercial Real Estate	0	0	0
Agricultural Real Estate	0	0	0
Real Estate Construction	0	0	0
Residential 1st Mortgages	0	0	0
Home Equity Lines and Loans	0	0	0
Agricultural	0	0	0
Commercial	0	0	0
Consumer & Other	0	0	0
Leases		0	0
Unallocated Allowance	0	0	0
Total Loans & Leases, Net of Deferred Fees & Allowance	0	0	0
Accrued Interest Receivable	0	0	0
Deposits [Abstract]
Demand	578,820	610,133	489,786
Interest Bearing Transaction	340,045	341,397	287,174
Savings and Money Market	699,308	644,260	639,370
Time	0	0	0
Total Deposits	1,618,173	1,595,790	1,416,330
Subordinated Debentures	0	0	0
Accrued Interest Payable	0	0	0
Estimated Fair Value [Member] \| Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0	0
Investment Securities Available-for-Sale [Abstract]
Government Agency & Government-Sponsored Entities	68,132	68,104	5,027
US Treasury Notes	19,966
Mortgage Backed Securities	276,601	287,948	329,730
Corporate Securities			41,386
Other	310	310	310
Fair/Book Value, Total	365,009	356,362	376,453
Investment Securities Held-to-Maturity [Abstract]
Obligations of States and Political Subdivisions	48,583	49,085	49,348
Mortgage Backed Securities			4
Other	2,139	2,147	2,761
Fair Value	50,722	51,232	52,113
Loans & Leases, Net of Deferred Fees & Allowance [Abstract]
Commercial Real Estate	0	0	0
Agricultural Real Estate	0	0	0
Real Estate Construction	0	0	0
Residential 1st Mortgages	0	0	0
Home Equity Lines and Loans	0	0	0
Agricultural	0	0	0
Commercial	0	0	0
Consumer & Other	0	0	0
Leases		0	0
Unallocated Allowance	0	0	0
Total Loans & Leases, Net of Deferred Fees & Allowance	0	0	0
Accrued Interest Receivable	7,324	7,797	6,732
Deposits [Abstract]
Demand	0	0	0
Interest Bearing Transaction	0	0	0
Savings and Money Market	0	0	0
Time	493,600	468,161	424,568
Total Deposits	493,600	468,161	424,568
Subordinated Debentures	6,250	6,227	6,220
Accrued Interest Payable	433	378	345
Estimated Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and Cash Equivalents	0	0	0
Investment Securities Available-for-Sale [Abstract]
Government Agency & Government-Sponsored Entities	0	0	0
US Treasury Notes	0
Mortgage Backed Securities	0	0	0
Corporate Securities			0
Other	0	0	0
Fair/Book Value, Total	0	0	0
Investment Securities Held-to-Maturity [Abstract]
Obligations of States and Political Subdivisions	13,496	13,403	13,996
Mortgage Backed Securities			0
Other	0	0	0
Fair Value	13,496	13,403	13,996
Loans & Leases, Net of Deferred Fees & Allowance [Abstract]
Commercial Real Estate	519,698	481,037	397,090
Agricultural Real Estate	346,742	353,288	326,210
Real Estate Construction	99,861	95,022	55,040
Residential 1st Mortgages	185,210	173,916	157,714
Home Equity Lines and Loans	31,332	32,456	33,994
Agricultural	210,769	274,195	198,836
Commercial	224,783	222,175	149,450
Consumer & Other	4,747	4,535	4,599
Leases	48,779	40,298	17,080
Unallocated Allowance	(3,146)	(1,529)	(2,520)
Total Loans & Leases, Net of Deferred Fees & Allowance	1,668,775	1,675,393	1,337,493
Accrued Interest Receivable	0	0	0
Deposits [Abstract]
Demand	0	0	0
Interest Bearing Transaction	0	0	0
Savings and Money Market	0	0	0
Time	0	0	0
Total Deposits	0	0	0
Subordinated Debentures	0	0	0
Accrued Interest Payable	$ 0	$ 0	$ 0

Fair value disclosure of accrued interest payable at the end of the period.

No definition available.

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- Definition

Fair value disclosure of accrued interest receivable at the end of period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmcb_
Data Type:	xbrli:monetaryItemType
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- Definition

Fair value disclosure of loans and lines of credit made to farmers to finance agricultural production.

+ References

No definition available.

+ Details

Name:	fmcb_AgriculturalFairValueDisclosure
Namespace Prefix:	fmcb_
Data Type:	xbrli:monetaryItemType
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- Definition

Fair value disclosure of loans secured by farmland.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of commercial loans at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of loans solely used for business purposes.

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No definition available.

+ Details

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- Definition

Fair value disclosure of consumer and other loans at the end of the period.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents corporate securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of demand deposits at the end of the period.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents debentures, notes and other debt securities issued by US government agencies and US government sponsored entities. Excludes US treasury Securities, as of the balance sheet date which have been categorized as available-for-sale.

+ References

No definition available.

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- Definition

Fair value disclosure of home equity lines of credit at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of interest bearing deposit at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of leases at the end of the period.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments as of the balance sheet date which have been categorized as Held-to-Maturity. The held-to-Maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of securities/investments categorized as other which are not in and of themselves material enough to require separate disclosure.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of securities/investments categorized as other which are not in and of themselves material enough to require separate disclosure.

+ References

No definition available.

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- Definition

Fair value disclosure for loans related to commercial real estate construction.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of residential first mortgages at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of savings and money market instrument at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of subordinated debentures at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of time deposits at the end of the period.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of unallocated loan allowances at the end of the period.

+ References

No definition available.

+ Details

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- Definition

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No definition available.

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- 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

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-Name Accounting Standards Codification

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-SubTopic 10

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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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- Details

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

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-SubTopic 10

-Section 50

-Paragraph 5

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

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- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Mortgage-Backed Securities

-URI http://asc.fasb.org/extlink&oid=6517959

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- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

+ References

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