Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 13,429us-gaap_ProfitLoss	$ 8,245us-gaap_ProfitLoss	$ 3,848us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization expense	3,224us-gaap_DepreciationAndAmortization	4,300us-gaap_DepreciationAndAmortization	4,421us-gaap_DepreciationAndAmortization
Deferred federal income taxes	(393)us-gaap_DeferredIncomeTaxExpenseBenefit	(257)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,851)us-gaap_DeferredIncomeTaxExpenseBenefit
Net realized gains	(134)us-gaap_RealizedInvestmentGainsLosses	(10,540)us-gaap_RealizedInvestmentGainsLosses	(1,943)us-gaap_RealizedInvestmentGainsLosses
Share-based payments expense	222us-gaap_ShareBasedCompensation	352us-gaap_ShareBasedCompensation	380us-gaap_ShareBasedCompensation
Change in ceded unearned premiums	(8,388)	(22,577)	(2,941)
Change in premiums receivable	154	(4,474)	(13,170)
Change in accounts receivable	(759)	728	836
Change in deferred policy acquisition costs	1,840	2,325	(2,357)
Change in unpaid losses and loss adjustment expenses	32,495	69,224	16,471
Change in unearned premiums	11,523	22,801	16,398
Change in reinsurance recoverable	(32,901)	(24,848)	(9,236)
Change in reinsurance balances payable	5,805	13,268	4,191
Change in current federal income tax payable	249us-gaap_IncreaseDecreaseInIncomeTaxes	(799)us-gaap_IncreaseDecreaseInIncomeTaxes	8,256us-gaap_IncreaseDecreaseInIncomeTaxes
Change in all other liabilities	7,946	(6,551)	5,396
Change in all other assets	(628)	17,141	5,983
Net cash provided by operating activities	33,684	68,338	33,682
Cash flows from investing activities:
Purchases of property and equipment, net	(546)	(673)	(107)
Net transfers from (into) restricted cash	276	(3,483)	665
Purchases of investment securities	(188,749)us-gaap_PaymentsToAcquireInvestments	(222,399)us-gaap_PaymentsToAcquireInvestments	(167,626)us-gaap_PaymentsToAcquireInvestments
Maturities, sales and redemptions of investment securities	146,777	214,738	148,968
Net cash used in investing activities	(42,242)	(11,817)	(18,100)
Cash flows from financing activities:
Activity under revolving credit facility, net	(1,473)		(2,577)
Redemption of non-controlling interest			(1,700)
Distribution to non-controlling interest			(281)
Payment of contingent consideration			(350)hall_PaymentOfContingentConsideration
Proceeds from exercise of employee stock options	1,155
Purchase of treasury shares	(1,805)
Net cash used in financing activities	(2,123)		(4,908)
(Decrease) Increase in cash and cash equivalents	(10,681)	56,521	10,674
Cash and cash equivalents at beginning of year	141,666	85,145	74,471
Cash and cash equivalents at end of year	130,985	141,666	85,145
Supplemental cash flow information:
Interest paid	(4,576)us-gaap_InterestPaid	(4,599)us-gaap_InterestPaid	(4,656)us-gaap_InterestPaid
Income taxes (paid) recovered	(5,497)us-gaap_IncomeTaxesPaidNet	(3,891)us-gaap_IncomeTaxesPaidNet	5,879us-gaap_IncomeTaxesPaidNet
Supplemental schedule of non-cash activities:
Change in receivable for securities related to investment disposals that settled after the balance sheet date	388	(1,317)	2,614
Change in payable for securities related to investment purchases that settled after the balance sheet date	$ 1,115	$ 206	$ (203)

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Publisher FASB

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-SubTopic 10

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

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-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

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-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 325

-Section 50

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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