Consolidated Statement of Changes in Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Balance, at Dec. 31, 2012	$ 332,153	$ 5,173	$ 29,352	$ 296,797	$ 1,206	$ (375)
Shares Issued, Beginning Balance (in shares) at Dec. 31, 2012		5,173,000
Net income	14,162			14,162
Dividends paid	(14,047)			(14,047)
Change in unrealized net gain on available-for-sale securities	3,254				3,254
Change in value of interest rate cap	0
Balance, at Mar. 31, 2013	335,522	5,173	29,352	296,912	4,460	(375)
Shares Issued, Ending Balance (in shares) at Mar. 31, 2013		5,173,000
Balance, at Dec. 31, 2013	333,581	5,173	29,745	297,515	1,522	(374)
Shares Issued, Beginning Balance (in shares) at Dec. 31, 2013	5,173,450	5,173,450
Net income	15,244			15,244
Dividends paid	(16,607)			(16,607)
Change in unrealized net gain on available-for-sale securities	1,841				1,841
Change in value of interest rate cap	42				42
Balance, at Mar. 31, 2014	$ 334,101	$ 5,173	$ 29,745	$ 296,152	$ 3,405	$ (374)
Shares Issued, Ending Balance (in shares) at Mar. 31, 2014	5,173,450	5,173,450