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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating Activities    
Net income $ 16,495 $ 13,006
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 644 522
Net amortization of investments 6,183 5,119
Deferred income taxes (1,772) (687)
Net realized (gains)/losses on investments 1,267 (1,928)
Loss on sale of asset 2  
Share-based compensation 669 237
Changes in operating assets and liabilities:    
Premiums receivable, net (38,295) (26,184)
Accrued interest receivable (488) (432)
Deferred policy acquisition costs (2,540) (2,875)
Other assets and federal income tax recoverable (2,121) (4,359)
Reserves for loss and loss adjustment expenses 23,020 20,301
Unearned premiums 24,188 23,002
Reinsurance balances (1,855) (3,608)
Amounts held for others and policyholder deposits 7,756 6,398
Accounts payable and other liabilities 26,293 13,399
Net cash provided by operating activities 59,446 41,911
Investing Activities    
Purchases of investments held-to-maturity (48,321) (64,889)
Purchases of investments available-for-sale (77,720) (50,252)
Purchases of short-term investments (72,680) (30,731)
Proceeds from maturities of investments held-to-maturity 62,403 86,588
Proceeds from sales and maturities of investments available-for-sale 11,179 28,434
Proceeds from sales and maturities of short-term investments 58,039 33,035
Purchases of property and equipment (662) (231)
Net cash provided by/(used in) investing activities (67,762) 1,954
Financing Activities    
Proceeds from stock option exercises 1,125 205
Tax benefit from share-based payments 883 132
Redemption of subordinate debt security   (12,890)
Dividends to stockholders (2,944)  
Net cash used in financing activities (936) (12,553)
Change in cash and cash equivalents (9,252) 31,312
Cash and cash equivalents at beginning of period 92,676 45,536
Cash and cash equivalents at end of period $ 83,424 $ 76,848