Other real estate owned related expenses in the statements of income.

No definition available.

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

- Definition

Represents the provision for unrealized losses related other real estate.

+ References

No definition available.

+ Details

Name:	hmta_ProvisionForUnrealizedLosses
Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense recognized during the period for the foreclosure on real estate assets.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeclosedRealEstateExpense
Namespace Prefix:	us-gaap_
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

Name:	us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_ResidentialLotsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_ResidentialDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_ResidentialRealEstate1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_CommercialLotsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_CommercialBuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 5 - Other Real Estate Owned - Classification of Other Real Estate Owned and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate Owned	$ 3,625	$ 3,148	$ 3,249	$ 3,794
Provision for unrealized losses	158
Operating expenses	141	13
Total Other Real Estate Owned	299	$ 13
Residential Lots [Member]
Other Real Estate Owned	1,609		1,745
Residential Development [Member]
Other Real Estate Owned	366
Residential Real Estate [Member]
Other Real Estate Owned	1,197		1,024
Commercial Lots [Member]
Other Real Estate Owned	63		90
Commercial Buildings [Member]
Other Real Estate Owned	$ 390		$ 390