Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 5,343us-gaap_ProfitLoss	$ 4,548us-gaap_ProfitLoss
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization expense	1,136us-gaap_DepreciationAndAmortization	844us-gaap_DepreciationAndAmortization
Deferred federal income taxes	(819)us-gaap_DeferredIncomeTaxExpenseBenefit	239us-gaap_DeferredIncomeTaxExpenseBenefit
Net realized gains	(584)us-gaap_RealizedInvestmentGainsLosses	(185)us-gaap_RealizedInvestmentGainsLosses
Share-based payments expense	371us-gaap_ShareBasedCompensation	110us-gaap_ShareBasedCompensation
Change in ceded unearned premiums	(1,747)	(1,347)
Change in premiums receivable	(11,121)	(1,625)
Change in accounts receivable	1,302	(926)
Change in deferred policy acquisition costs	(384)	(266)
Change in unpaid losses and loss adjustment expenses	7,470	13,014
Change in unearned premiums	5,425	1,691
Change in reinsurance recoverable	(579)	(8,322)
Change in reinsurance balances payable	3,528	24
Change in current federal income tax payable	2,445us-gaap_IncreaseDecreaseInIncomeTaxes	1,086us-gaap_IncreaseDecreaseInIncomeTaxes
Change in all other liabilities	(6,430)	(2,690)
Change in all other assets	(1,647)	(1,088)
Net cash provided by operating activities	3,709	5,107
Cash flows from investing activities:
Purchases of property and equipment	(456)	(98)
Net transfers from restricted cash	2,111	478
Purchases of investment securities	(26,735)us-gaap_PaymentsToAcquireInvestments	(33,149)us-gaap_PaymentsToAcquireInvestments
Maturities, sales and redemptions of investment securities	20,923	39,289
Net cash (used in) provided by investing activities	(4,157)	6,520
Cash flows from financing activities:
Proceeds from exercise of employee stock options	202
Purchase of treasury shares	(288)
Net cash used in financing activities	(86)
(Decrease) increase in cash and cash equivalents	(534)	11,627
Cash and cash equivalents at beginning of period	130,985	141,666
Cash and cash equivalents at end of period	130,451	153,293
Supplemental cash flow information:
Interest paid	1,140us-gaap_InterestPaid	1,152us-gaap_InterestPaid
Income taxes paid	720us-gaap_IncomeTaxesPaidNet	539us-gaap_IncomeTaxesPaidNet
Supplemental schedule of non-cash investing activities:
Change in receivable for securities related to investment disposals that settled after the balance sheet date	(359)	(289)
Change in payable for securities related to investment purchases that settled after the balance sheet date	$ 13,203	$ 12,109

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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))

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 325

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration