Note 8 - Federal Home Loan Bank Borrowings (Details) - Federal Home Loan Bank of Atlanta Borrowings - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank Borrowings	$ 22,191	$ 20,356
Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank Borrowings	$ 22,000	20,000
Advance Date September 7, 2007 [Member] \| Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturity Date	Sep. 07, 2017
Current Rate	3.69%
Federal Home Loan Bank Borrowings	$ 4,000	4,000
Advance Date April 13, 2012 [Member] \| Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturity Date	Apr. 13, 2016
Current Rate	1.265%
Federal Home Loan Bank Borrowings	$ 12,000	12,000
Advance Date June 17, 2014 A [Member] \| Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturity Date	Jun. 17, 2015
Current Rate	0.26%
Federal Home Loan Bank Borrowings		2,000
Advance Date June 17, 2014 B [Member] \| Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturity Date	Jun. 17, 2016
Current Rate	0.67%
Federal Home Loan Bank Borrowings	$ 2,000	$ 2,000
Advance Date January 14, 2015 [Member] \| Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturity Date	Jan. 16, 2018
Current Rate	1.09%
Federal Home Loan Bank Borrowings	$ 4,000

Date when the Federal Home Loan Bank advance is scheduled to be fully repaid, in CCYY-MM-DD format.

No definition available.

Name:	hmta_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosureMaturityDate
Namespace Prefix:	hmta_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=us-gaap_FederalHomeLoanBankOfAtlantaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=hmta_AdvanceDateSeptember72007Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=hmta_AdvanceDateApril132012Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=hmta_AdvanceDateJune172014AMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=hmta_AdvanceDateJune172014BMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=hmta_AdvanceDateJanuary142015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: