Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Series A Preferred Stock	Series B Preferred Stock	Series D Preferred Stock	Non-Voting Common Stock	Common Stock	Common Stock Issuable	Capital Surplus	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2011	$ 217	$ 177,092	$ 16,613	$ 15,914	$ 41,647	$ 3,233	$ 1,054,940	$ (730,861)	$ (3,309)	$ 575,486
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income								11,528		11,528
Other comprehensive loss									(5,756)	(5,756)
Common stock issued to dividend reinvestment plan and to employee benefit plans					36		242			278
Amortization of stock options and restricted stock awards							585			585
Vesting of restricted stock					4	(151)	187			40
Deferred compensation plan, net, including dividend equivalents						49				49
Shares issued from deferred compensation plan					2	(183)	181
Preferred stock dividends:
Series A								(3)		(3)
Series B		359						(2,608)		(2,249)
Series D								(419)		(419)
Balance at Mar. 31, 2012	217	177,451	16,613	15,914	41,689	2,948	1,056,135	(722,363)	(9,065)	579,539
Balance at Dec. 31, 2012	217	178,557	16,613	15,317	42,424	3,119	1,057,951	(709,153)	(23,640)	581,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income								11,765		11,765
Other comprehensive loss									815	815
Common stock issued to dividend reinvestment plan and to employee benefit plans					18		171			189
Conversion of non-voting common stock				(613)	613
Amortization of stock options and restricted stock awards							626			626
Vesting of restricted stock					4		40			44
Deferred compensation plan, net, including dividend equivalents						46				46
Shares issued from deferred compensation plan					5	(439)	434
Preferred stock dividends:
Series A								(3)		(3)
Series B		380						(2,630)		(2,250)
Series D								(419)		(419)
Balance at Mar. 31, 2013	$ 217	$ 178,937	$ 16,613	$ 14,704	$ 43,064	$ 2,726	$ 1,059,222	$ (700,440)	$ (22,825)	$ 592,218