Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income	$ 13,006	$ 11,224
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	522	529
Net amortization of investments	5,119	2,803
Deferred income taxes	(687)	834
Net realized gains on investments	(1,928)	(248)
Share-based compensation	237	261
Changes in operating assets and liabilities:
Premiums receivable, net	(26,184)	(17,842)
Accrued interest receivable	(432)	(673)
Deferred policy acquisition costs and deferred charges	(2,875)	(2,916)
Other assets and federal income tax recoverable	(4,359)	(2,684)
Reserves for loss and loss adjustment expenses	20,301	(5,156)
Unearned premiums	23,002	16,955
Reinsurance balances	(3,608)	1,787
Amounts held for others and policyholder deposits	6,398	1,954
Accounts payable and other liabilities	13,399	(2,169)
Net cash provided by operating activities	41,911	4,659
Investing Activities
Purchases of investments held-to-maturity	(64,889)	(49,416)
Purchases of investments available-for-sale	(50,252)	(43,530)
Purchases of short-term investments	(30,731)	(49,969)
Proceeds from maturities of investments held-to-maturity	86,588	61,452
Proceeds from sales and maturities of investments available-for-sale	28,434	13,223
Proceeds from sales and maturities of short-term investments	33,035	65,141
Purchases of property and equipment	(231)	(316)
Net cash provided by (used in) investing activities	1,954	(3,415)
Financing Activities
Proceeds from stock option exercised	205	1,993
Tax benefit from share-based payments	132	700
Treasury shares purchased		(2,859)
Redemption of subordinate debt security	(12,890)
Net cash used in financing activities	(12,553)	(166)
Change in cash and cash equivalents	31,312	1,078
Cash and cash equivalents at beginning of period	45,536	60,966
Cash and cash equivalents at end of period	$ 76,848	$ 62,044