Fair Value (Details Textual) (Fair Value, Inputs, Level 3 [Member])	3 Months Ended
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Current Yield to Maturity, Percentage	9.20%

The fair value of the discounted cash flows using current yield to maturity, which is based on the relevant spread over LIBOR for this particular loan to discount future cash flows.

No definition available.

Name:	hall_CurrentYieldToMaturityPercentage
Namespace Prefix:	hall_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration