Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income	$ 16,169	$ 13,524
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	222	266
Net amortization of investments	3,151	3,769
Deferred income taxes	264	(13)
Net realized losses on investments	31	181
Net unrealized losses on equity securities	390
Net realized losses on disposal of assets		2
Share-based compensation	18	416
Changes in operating assets and liabilities:
Premiums receivable, net	(12,564)	(8,271)
Accrued interest receivable	(697)	(547)
Deferred policy acquisition costs	(1,036)	(566)
Amounts held by others	(7,855)
Other assets	2,438	(1,148)
Reserves for loss and loss adjustment expenses	5,453	6,720
Unearned premiums	7,702	1,775
Reinsurance balances	(4,040)	741
Amounts held for others and policyholder deposits	402	414
Accounts payable and other liabilities	2,618	6,531
Net cash provided by operating activities	12,666	23,794
Investing activities
Purchases of investments held-to-maturity	(17,925)	(53,640)
Purchases of investments available-for-sale	(28,510)	(34,081)
Purchases of short-term investments	(28,688)	(4,907)
Proceeds from maturities of investments held-to-maturity	19,127	19,752
Proceeds from sales and maturities of investments available-for-sale	25,004	29,851
Proceeds from sales and maturities of short-term investments	4,000	1,630
Proceeds from redemptions of other investments		2,000
Purchases of property and equipment	(868)	(73)
Net cash used in investing activities	(27,860)	(39,468)
Financing activities
Proceeds from stock option exercises	68
Dividends to shareholders	(4,361)	(3,909)
Net cash used in financing activities	(4,293)	(3,909)
Change in cash and cash equivalents	(19,487)	(19,583)
Cash and cash equivalents at beginning of period	55,559	58,936
Cash and cash equivalents at end of period	$ 36,072	$ 39,353