Consolidated Statements of Shareholders' Equity Statement (USD $) In Thousands	Total	Preferred Stock Including Additional Paid in Capital [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]	Shareholders' Equity [Member]
Total shareholders' equity, beginning balance at Dec. 31, 2012
Stock issuance			$ 7	$ 7,548
Granting and vesting of restricted stock			3	2,376
Amortization of stock issuance costs				(119)
Adjustments for tax withholding on share-based compensation			(1)	(545)
Net income (loss)	68,069
Other comprehensive (loss) income	(86,327)
Total shareholders' equity, ending balance at Dec. 31, 2013	585,876	0	404	634,683	(3,255)	(260,483)	371,349
Stock issuance		0	1	251			252
Granting and vesting of restricted stock			4	2,715			2,719
Amortization of stock issuance costs				(75)			(75)
Adjustments for tax withholding on share-based compensation			(1)	(506)			(507)
Net income (loss)	27,806					27,806	27,806
Dividends on preferred stock						(9,176)	(9,176)
Dividends on common stock						(54,725)	(54,725)
Other comprehensive (loss) income	55,132				55,132		55,132
Total shareholders' equity, ending balance at Dec. 31, 2014	$ 607,302	$ 109,658	$ 547	$ 763,935	$ 21,316	$ (288,154)	$ 607,302