Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities
Net income	$ 20,127	$ 16,108
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	799	778
Net amortization of investments	7,504	4,559
Deferred income taxes	(2,392)	1,169
Net realized gains on investments	(2,913)	(760)
Loss on sale of asset	1
Share-based compensation	431	361
Changes in operating assets and liabilities:
Premiums receivable, net	(21,979)	(10,465)
Accrued interest receivable	(326)	(1,511)
Deferred policy acquisition costs	(2,252)	(2,959)
Other assets and federal income tax recoverable	131	(3,105)
Reserves for loss and loss adjustment expenses	26,029	45
Unearned premiums	23,828	14,681
Reinsurance balances	(2,895)	1,634
Amounts held for others and policyholder deposits	8,698	3,303
Accounts payable and other liabilities	4,262	5,934
Net cash provided by operating activities	59,054	29,772
Investing Activities
Purchases of investments held-to-maturity	(72,441)	(59,697)
Purchases of investments available-for-sale	(84,680)	(76,551)
Purchases of short-term investments	(61,002)	(64,623)
Proceeds from maturities of investments held-to-maturity	105,590	76,513
Proceeds from sales and maturities of investments available-for-sale	48,208	23,554
Proceeds from sales and maturities of short-term investments	55,360	96,961
Purchases of property and equipment	(837)	(683)
Net cash used in investing activities	(9,802)	(4,526)
Financing Activities
Proceeds from stock option exercises	205	1,993
Tax benefit from share-based payments	132	701
Treasury shares purchased		(9,656)
Redemption of subordinate debt security	(25,780)	(10,310)
Net cash used in financing activities	(25,443)	(17,272)
Change in cash and cash equivalents	23,809	7,974
Cash and cash equivalents at beginning of period	45,536	60,966
Cash and cash equivalents at end of period	$ 69,345	$ 68,940