CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities
Net income	$ 43,637	$ 29,353	$ 24,181
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,300	1,112	1,015
Net amortization/accretion of investments	13,350	10,151	6,660
Deferred income taxes	(207)	115	(1,525)
Net realized (gains) losses on investments	1,211	(2,979)	(2,228)
Loss on sale of asset	2	1	32
Share-based compensation	1,409	641	471
Changes in operating assets and liabilities:
Premiums receivable, net	(29,629)	(20,727)	1,395
Accrued interest receivable	(850)	(872)	(1,816)
Deferred policy acquisition costs	(752)	(1,841)	(1,441)
Other assets	1,581	445	(2,008)
Reserve for loss and loss adjustment expenses	44,107	32,236	6,010
Unearned premiums	23,768	21,829	7,205
Reinsurance balances	26,177	(5,910)	140
Amounts held for others and policyholder deposits	238	12,912	5,355
Accounts payable and other liabilities	3,561	4,582	263
Net cash provided by operating activities	128,903	81,048	43,709
Investing activities
Purchases of investments held-to-maturity	(77,868)	(79,042)	(86,669)
Purchases of investments available-for-sale	(135,798)	(92,751)	(120,637)
Purchases of short-term investments	(131,981)	(95,954)	(87,460)
Purchases of other invested assets	(10,000)
Proceeds from maturities of investments held-to-maturity	117,750	134,994	97,863
Proceeds from sales and maturities of investments available-for-sale	29,099	52,514	36,329
Proceeds from sales and maturities of short-term investments	112,978	72,105	118,759
Purchases of property and equipment	(1,140)	(1,196)	(1,128)
Net cash provided by investing activities	(96,960)	(9,330)	(42,943)
Financing activities
Proceeds from stock option exercise	2,344	781	3,339
Tax benefit from share-based payments	2,024	421	1,043
Purchase of treasury stock			(10,268)
Redemption of subordinated debt securities		(25,780)	(10,310)
Dividends to shareholders	(5,910)
Net cash used in financing activities	(1,542)	(24,578)	(16,196)
Change in cash and cash equivalents	30,401	47,140	(15,430)
Cash and cash equivalents at beginning of year	92,676	45,536	60,966
Cash and cash equivalents at end of year	123,077	92,676	45,536
Supplemental disclosure of cash flow information
Interest paid		686	1,412
Income taxes paid	$ 12,512	$ 7,004	$ 1,000