Consolidated Statements of Changes in Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Parent [Member]	Noncontrolling Interest [Member]
Balance, at Dec. 31, 2011	$ 363,245	$ 5,173	$ 31,801	$ 322,201		$ (375)	$ 358,800	$ 4,445
Shares Issued, Beginning Balance at Dec. 31, 2011		5,173,000
Net income (loss)	19,424			19,482			19,482	(58)
Dividends paid	(19,151)			(19,151)			(19,151)
Change in unrealized net gain on securities available-for-sale	0
Balance, at Mar. 31, 2012	363,518	5,173	31,801	322,532		(375)	359,131	4,387
Shares Issued, Ending Balance at Mar. 31, 2012		5,173,000
Balance, at Dec. 31, 2012	332,153	5,173	29,352	296,797	1,206	(375)	332,153	0
Shares Issued, Beginning Balance at Dec. 31, 2012	5,173,450	5,173,000
Net income (loss)	14,162			14,162			14,162	0
Dividends paid	(14,047)			(14,047)			(14,047)
Change in unrealized net gain on securities available-for-sale	3,254				3,254		3,254
Balance, at Mar. 31, 2013	$ 335,522	$ 5,173	$ 29,352	$ 296,912	$ 4,460	$ (375)	$ 335,522	$ 0
Shares Issued, Ending Balance at Mar. 31, 2013	5,173,450	5,173,000