Investment Securities, Part II (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	$ 77,828,000
After 1 through 5 years	213,809,000
After 5 through 10 years	85,800,000
After ten years	419,000
Fair Value	377,856,000	488,724,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths)	1.78%
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths)	2.43%
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths)	1.13%
Available-for-sale , Weighted Average Yield, Maturities (in hundredths)	2.35%
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths)	1.99%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths)	2.85%
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths)	2.73%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths)	3.79%
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths)	1.13%
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths)	2.86%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
One year or less	43,925,000
After 1 through 5 years	0
After 5 through 10 years	9,725,000
After ten years	0
Amortized Cost	53,650,000us-gaap_HeldToMaturitySecurities	0us-gaap_HeldToMaturitySecurities
Held To Maturity Weighted Average Yield Maturities Year One	2.13%
Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years	0.00%
Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years	2.28%
Held To Maturity Weighted Average Yield Maturities After 10 Years	0.00%
Held To Maturity Weighted Average Yield Maturities	2.22%
Held To Maturity Tax Equivalent Yield Maturities Year One	2.13%
Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years	0.00%
Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years	2.28%
Held To Maturity Tax Equivalent Yield Maturities After 10 Years	0.00%
Held To Maturity Tax Equivalent Yield Maturities	2.22%
Tax rate used to calculate tax-equivalent yields (in hundredths)	35.00%
Percentage investment book value exceeds total stockholders' equity (in hundredths)	10.00%
Investment Securities Pledged as Collateral	330,000,000	321,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	30,440,000	348,118,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		13,624,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	119,022,000	1,012,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses	5,156,000	3,526,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	149,462,000	349,130,000
Total Unrealized Losses	(5,380,000)	(17,150,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(224,000)
Details of Trust Preferred Securities [Abstract]
Coupon Rate of Trust Preferred Security	floating rate coupon of 3-month LIBOR plus 90 basis points
Number of Ratios Utilized in OTTI Credit Model	29
OTTI Cash Flow Initial Default Rate	2.00%fmbh_OTTICashFlowInitialDefaultRate
Period For Initial Default Rate Used In OTTI Analysis	two years
Default Rate Applied For Remainder Of OTTI Analysis	36 basis points
Recovery Rate Used In OTTI Cash Flow Analysis	10.00%
Credit losses on trust preferred securities held [Abstract]
Beginning of period	1,111,000	3,989,000	4,116,000
Additions related to OTTI losses not previously recognized	0	0	0
Reductions due to sales / (recoveries)	0	(2,878,000)	(127,000)
Reductions due to change in intent or likelihood of sale	0	0	0
Additions related to increases in previously recognized OTTI losses	0	0	0
Reductions due to increases in expected cash flows	0	0	0
End of period	1,111,000	1,111,000	3,989,000
Proceeds from maturities of securities held-to-maturity	57,133,000	134,300,000	235,013,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Due in one year or less	75,041,000
Due after one-five years	65,428,000
Due after five-ten years	40,345,000
Due after ten years	3,335,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	184,149,000
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]
Mortgage-backed securities: GSE residential	193,814,000
Total available-for-sale	377,963,000
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]
Due in one year or less	74,057,000
Due after one-five years	66,371,000
Due after five-ten years	41,608,000
Due after ten years	419,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date	182,455,000
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Mortgage-backed securities: GSE residential	195,401,000
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Due in one year or less	44,169,000
Due after one-five years	0
Due after five-ten years	9,768,000
Due after ten years	0
Fair Value	53,937,000	0
PreTSL XXVIII
Details of Trust Preferred Securities [Abstract]
Book Value	3,300,000
Market Value	364,000
Unrealized Gains (Losses)	(2,936,000)
Other-than- temporary Impairment Recorded To-date	(1,111,000)
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	68,602,000
After 1 through 5 years	31,355,000
After 5 through 10 years	0
After ten years	0
Fair Value	99,957,000	190,368,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
One year or less	43,925,000
After 1 through 5 years	0
After 5 through 10 years	9,725,000
After ten years	0
Amortized Cost	53,650,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	7,289,000	183,074,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	46,000	7,574,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	75,030,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses	1,312,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	82,319,000	183,074,000
Total Unrealized Losses	(1,358,000)	(7,574,000)
Number of securities in Unrealized Loss Positions	16
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,853,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(12,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	4,853,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(12,000)
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Fair Value	53,937,000
Obligations of states and political subdivisions
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	5,455,000
After 1 through 5 years	35,016,000
After 5 through 10 years	37,613,000
After ten years	0
Fair Value	78,084,000	64,562,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	3,586,000	29,986,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1,708,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,416,000	808,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses	94,000	65,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,002,000	30,794,000
Total Unrealized Losses	(113,000)	(1,773,000)
Number of securities in Unrealized Loss Positions	10	2
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(19,000)
Mortgage-backed securities: GSE residential
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	3,771,000
After 1 through 5 years	147,438,000
After 5 through 10 years	44,192,000
After ten years	0
Fair Value	195,401,000	227,601,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	19,565,000	131,125,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		4,275,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	37,224,000	13,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses	802,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	56,789,000	131,138,000
Total Unrealized Losses	(961,000)	(4,275,000)
Number of securities in Unrealized Loss Positions	11	1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(159,000)
Trust preferred securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	0
After 1 through 5 years	0
After 5 through 10 years	0
After ten years	364,000
Fair Value	364,000	191,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	364,000	191,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses	2,936,000	3,461,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	364,000	191,000
Total Unrealized Losses	(2,936,000)	(3,461,000)
Number of securities in Unrealized Loss Positions	1	1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Credit losses on trust preferred securities held [Abstract]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	1,400,000
Proceeds from maturities of securities held-to-maturity		139,000
Other securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	0
After 1 through 5 years	0
After 5 through 10 years	3,995,000
After ten years	55,000
Fair Value	4,050,000	6,002,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, Fair Value	0	3,933,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		67,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,988,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses	12,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,988,000	3,933,000
Total Unrealized Losses	(12,000)	(67,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0

AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value

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AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value

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AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value

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AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after one through five years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after five through ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available for sale government security, when the effect of reduced taxes are taken into account, for securities that mature after ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature in less than twelve months. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities after ten years.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities after one through five years.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities after five through ten years.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities of one year or less.

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Coupon Rate of Trust Preferred Security

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Default Rate Applied For Remainder Of OTTI Analysis Following Initial Two Year Period

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Held To Maturity Tax Equivalent Yield Maturities

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Held To Maturity Tax Equivalent Yield Maturities After 10 Years

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Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years

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Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years

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Held To Maturity Tax Equivalent Yield Maturities Year One

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Held To Maturity Weighted Average Yield Maturities

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Held To Maturity Weighted Average Yield Maturities After 10 Years

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Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years

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Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years

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Held To Maturity Weighted Average Yield Maturities Year One

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Number of Ratios Utilized in OTTI Evaluation Credit Model developed by Third Party

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OTTI Cash Flow Default Rate used for first two years of analysis

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Percentage investment book value exceeds total stockholders' equity.

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Number of Years Initial Default Rate Is Applied In OTTI Analysis

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Recovery Rate Used In OTTI Cash Flow Analysis

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This item represents the book value cost of trust preferred securities.

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This item represents the market value cost of trust preferred securities.

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The amount of other than temporary impairment losses on trust preferred securities which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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Amount of the excess of amortized cost basis over fair value of preferred trust securities in a loss position.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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