The percentage of ceded risk to the reinsurers.

No definition available.

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

- Definition

The proportional reinsurance retention percentage.

+ References

No definition available.

+ Details

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

- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses on all commercial property risks, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

+ References

No definition available.

+ Details

Name:	hall_ReinsuranceRecoverablesForAllCommercialPropertyRisk
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The known and estimated maximum amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses for all workers.

+ References

No definition available.

+ Details

Name:	hall_ReinsuranceRecoverablesForAllWorkersCompensationLosses
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

"The reinsures reimburse amount. The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses on each airport liability loss, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance."

+ References

No definition available.

+ Details

Name:	hall_ReinsuranceRecoverablesForEachAirportLiabilityLoss
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

"The reinsures reimburse amount. The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses on the aircraft hull and liability loss, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance."

+ References

No definition available.

+ Details

Name:	hall_ReinsuranceRecoverablesForEachCombinedAirCraftHullAndLiabilityLoss
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses on each commercial property risks, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

+ References

No definition available.

+ Details

Name:	hall_ReinsuranceRecoverablesForEachCommercialPropertyRisk
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses for each workers compensation loss, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

+ References

No definition available.

+ Details

Name:	hall_ReinsuranceRecoverablesForEachWorkersCompensationLosses
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The reinsurance percentage for fronting fee with third party.

+ References

No definition available.

+ Details

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

- Definition

The amount recovered for reinsurance reimbursement losses.

+ References

No definition available.

+ Details

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

- Definition

The retention value of facultative reinsurance which is purchased on any commercial property.

+ References

No definition available.

+ Details

Name:	hall_RetentionValueOfFacultativeReinsurance
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The maximum retention value limit on losses incurred.

+ References

No definition available.

+ Details

Name:	hall_RetentionValueOfLossIncurred
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The assumed risk percentage of general agency agreement with an unaffiliated carrier.

+ References

No definition available.

+ Details

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

- Definition

Amount represents the value of risks for calculating cede percentage which is pertaining to facultative reinsurance.

+ References

No definition available.

+ Details

Name:	hall_ValueOfRisksForCalculatingCededRateFacultativeReinsurance
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount represents the value of risks for calculating retention percentage which is pertaining to facultative reinsurance.

+ References

No definition available.

+ Details

Name:	hall_ValueOfRisksForCalculatingRetentionRateFacultativeReinsurance
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The workers compensation loss are limited to aggregate amount for recoverables.

+ References

No definition available.

+ Details

Name:	hall_WorkersCompensationLossAggregateLimit
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 113

-Paragraph 14, 16, 27, 113

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),6)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

Reinsurance (Details Textual) (USD $)			9 Months Ended								9 Months Ended			9 Months Ended					9 Months Ended				1 Months Ended	5 Months Ended	9 Months Ended
Reinsurance (Details Textual) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 E&S Commercial [Member]	Sep. 30, 2012 E&S Commercial [Member] Maximum [Member]	Sep. 30, 2012 E&S Commercial [Member] Minimum [Member]	Sep. 30, 2012 Excess and Umbrella Business Unit [Member]	Sep. 30, 2012 Hallmark County Mutual [Member]	Sep. 30, 2012 Catastrophe [Member]	Sep. 30, 2012 Catastrophe [Member] Maximum [Member]	Sep. 30, 2012 Catastrophe [Member] Minimum [Member]	Sep. 30, 2012 Catastrophe [Member] State Of Texas [Member]	Sep. 30, 2012 Catastrophe [Member] State Of Texas [Member] Maximum [Member]	Sep. 30, 2012 Catastrophe [Member] State Of Texas [Member] Minimum [Member]	Sep. 30, 2012 Commercial Property [Member]	Sep. 30, 2012 Commercial Property [Member] Maximum [Member]	Sep. 30, 2012 Commercial Property [Member] Minimum [Member]	Sep. 30, 2012 Commercial Liability Risk [Member]	Sep. 30, 2012 Commercial Liability Risk [Member] Maximum [Member]	Sep. 30, 2012 Aviation Risk [Member]	Sep. 30, 2012 Aviation Risk [Member] Maximum [Member]	Sep. 30, 2012 Workers Compensation Risks [Member]	Sep. 30, 2012 Workers Compensation Risks [Member] Maximum [Member]	Jun. 30, 2012 Medical Professional Liability Risks [Member]	May 31, 2012 Medical Professional Liability Risks [Member]	Sep. 30, 2012 Standard Commercial P And C Business Unit [Member]
Retention Value Of Loss Incurred								$ 6,000,000						$ 1,000,000			$ 1,000,000		$ 1,000,000		$ 1,000,000
Reinsurers Reimbursement Percentage For Specified Loss Amount								100.00%			100.00%	87.50%									100.00%
Reinsurance recoverable	50,109,000	42,734,000						50,000,000	25,000,000	9,000,000		9,000,000	6,000,000					5,000,000
Reinsurance Recoverables For Each Commercial Property Risk														5,000,000
Reinsurance Recoverables For All Commercial Property Risk															30,000,000	10,000,000
Retention Value Of Facultative Reinsurance																6,000,000
Reinsurance Recoverables For Each Combined Air Craft Hull and Liability Loss																				5,500,000
Reinsurance Recoverables For Each Airport Liability Loss																				4,000,000
Reinsurance Recoverables For Each Workers Compensation Losses																						14,000,000
Reinsurance Recoverables For All Workers Compensation Losses																						10,000,000
Workers Compensation Loss Aggregate Limit																						28,000,000
Risk Percentage Assumed Of Unaffliated Carrier, Issuances Prior To 2009						35.00%
Proportional Reinsurance Retaining Percentage			10.00%			20.00%																	50.00%	40.00%	100.00%
Value Of Risks For Calculating Retention Rate Facultative Reinsurance			1,000,000
Ceded Risk Percentage				100.00%	90.00%	80.00%																	50.00%	60.00%
Reinsured Percentage For Fronting Fee							100.00%
Value Of Risks For Calculating Ceded Rate, Facultative Reinsurance			$ 1,000,000