Note 11 - Fair Value Measurements (Details) - Fair Value Quantitative Information - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Discounted Appraised Value [Member] \| Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans		6.00%
Impaired loans		(6.00%)
Range		94.00%
Weighted average		(94.00%)
Other real estate owned		6.00%
Other real estate owned		(6.00%)
Discounted Appraised Value [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans		6.00%
Impaired loans		(6.00%)
Range		4.00%
Weighted average		(4.00%)
Other real estate owned		6.00%
Other real estate owned		(6.00%)
Internal Evaluations [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
		11.00%
		(11.00%)
Fair Value, Inputs, Level 3 [Member] \| Discounted Appraised Value [Member] \| Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans (in Dollars)	$ 110	$ 0
Impaired loans	0.00%	6.00%
Impaired loans	(0.00%)	(6.00%)
Range	94.50%	94.00%
Weighted average	(94.50%)	(94.00%)
Other real estate owned	0.00%	6.00%
Other real estate owned	(0.00%)	(6.00%)
Fair Value, Inputs, Level 3 [Member] \| Discounted Appraised Value [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	6.00%	6.00%
Impaired loans	(6.00%)	(6.00%)
Range	8.00%	4.00%
Weighted average	(8.00%)	(4.00%)
(in Dollars)	$ 1,735	$ 1,458
Other real estate owned (in Dollars)	$ 1,735	$ 1,458
Other real estate owned	6.00%	6.00%
Other real estate owned	(6.00%)	(6.00%)
Fair Value, Inputs, Level 3 [Member] \| Internal Evaluations [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
(in Dollars)	$ 2,202	$ 2,273
	21.00%	0.00%
	(21.00%)	(0.00%)
Other real estate owned (in Dollars)	$ 2,202	$ 2,273
Fair Value, Inputs, Level 3 [Member] \| Minimum [Member] \| Discounted Appraised Value [Member] \| Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	0.00%
Impaired loans	(0.00%)
Range	94.50%
Weighted average	(94.50%)
Other real estate owned	0.00%
Other real estate owned	(0.00%)
Fair Value, Inputs, Level 3 [Member] \| Minimum [Member] \| Discounted Appraised Value [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	6.00%
Impaired loans	(6.00%)
Range	4.00%
Weighted average	(4.00%)
Other real estate owned	6.00%
Other real estate owned	(6.00%)
Fair Value, Inputs, Level 3 [Member] \| Minimum [Member] \| Internal Evaluations [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
	4.00%
	(4.00%)
Fair Value, Inputs, Level 3 [Member] \| Weighted Average [Member] \| Discounted Appraised Value [Member] \| Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	0.00%	6.00%
Impaired loans	(0.00%)	(6.00%)
Range	94.50%	94.00%
Weighted average	(94.50%)	(94.00%)
Other real estate owned	0.00%	6.00%
Other real estate owned	(0.00%)	(6.00%)
Fair Value, Inputs, Level 3 [Member] \| Weighted Average [Member] \| Discounted Appraised Value [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	6.00%	6.00%
Impaired loans	(6.00%)	(6.00%)
Range	9.00%	4.00%
Weighted average	(9.00%)	(4.00%)
Other real estate owned	6.00%	6.00%
Other real estate owned	(6.00%)	(6.00%)
Fair Value, Inputs, Level 3 [Member] \| Weighted Average [Member] \| Internal Evaluations [Member] \| Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
	39.00%	33.00%
	(39.00%)	(33.00%)

Internal evaluations used to measure fair value.

No definition available.

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Namespace Prefix:	hmta_
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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

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- Definition

Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28.FN6)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule III)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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