Name:	mitt_DebtSecuritiesAvailableForSaleAllocatedAndSingleMaturityDateMaturityAfter10YearsAmortizedCostFVO
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of investment in debt securities, measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfter10YearsFairValueFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amortized cost of investment in debt securities measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsAmortizedCostFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of investment in debt securities measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsFairValueFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amortized cost of investment in debt securities measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsAmortizedCostFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of investment in debt securities measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsFairValueFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amortized cost of investments in debt securities measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of investments in debt securities measured at fair value with changes in fair value recognized in net income (available-for-sale), with single maturity date and allocated without single maturity date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amortized cost of investments in debt securities measured at fair value with changes in fair value recognized in net income income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearAmortizedCostFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of investments in debt securities measured at fair value with changes in fair value recognized in net income income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

No definition available.

Name:	mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearFairValueFVO
Namespace Prefix:	mitt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

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

- References

No definition available.