Note 5 - Other Real Estate Owned - Foreclosed Properties Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Other Real Estate Owned, balance	$ 4,046	$ 4,619
Other Real Estate Owned, Additions	697	1,024
Other Real Estate Owned, Writedowns
Other Real Estate Owned, Sales	(2,522)	(1,597)
Other Real Estate Owned, balance	2,221	4,046
Valuation Allowance, balance	(797)	(825)
Valuation Allowance, Additions
Valuation Allowance, Writedowns	(158)	(588)
Valuation Allowance, Sales	627	616
Valuation Allowance, balance	(328)	(797)
Balance, net	3,249	3,794
Additions, Net	697	1,024
Writedowns, Net	(158)	(588)
Sales, Net	(1,895)	(981)
Balance, net	$ 1,893	$ 3,249

Disposals of real estate acquired through foreclosure before the application of a valuation allowance.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The gross amount of additions to real estate acquired through foreclosure.

+ References

No definition available.

+ Details

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Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Additions of real estate acquired through foreclosure net of a valuation allowance.

+ References

No definition available.

+ Details

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Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of real estate acquired through foreclosure before the application of a valuation allowance.

+ References

No definition available.

+ Details

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Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The gross value ofwreal estate acquired through foreclosure write down during period.

+ References

No definition available.

+ Details

Name:	hmta_RealEstateAcquiredThroughForeclosureGrossWritedowns
Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Impact on the valuation allowance of other real estate owned due to sales during the period.

+ References

No definition available.

+ Details

Name:	hmta_RealEstateOwnedValuationAllowanceSales
Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain recognized in the income statement for an increase in valuation of real estate owned (REO).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1720-110224

+ Details

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