Name:	hmta_SalaryContinuationPlanBaseSalaryPeriod
Namespace Prefix:	hmta_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period of time immediately prior to the retirement of a participant that will be used to determine the average base salary of the participant for calculations related to an additional benefit if certain performance targets are met under a salary continuation plan.

No definition available.

Name:	hmta_SalaryContinuationPlanBaseSalaryPeriodAdditionalBenefit
Namespace Prefix:	hmta_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The percentage of a participant’s average annual base salary for the five years immediately prior to retirement which will be provided as lifetime payments to the participant.

No definition available.

Name:	hmta_SalaryContinuationPlanLifetimePaymentPercentage
Namespace Prefix:	hmta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of a participant’s average annual base salary for the five years immediately prior to retirement which will be provided as an additional benefit on top of lifetime payments already being made to the participant if certain performance targets are met.

No definition available.

Name:	hmta_SalaryContinuationPlanLifetimePaymentPercentageAdditionalBenefit
Namespace Prefix:	hmta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

No definition available.