Income Taxes (Provision For Deferred Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal Income taxes currently payable									$ 6,742	$ 2,687	$ 4,248
State Income taxes currently payable									288	0	0
Deferred income taxes related to Provision for loan losses									6,399	(460)	(3,042)
Deferred income taxes related to Other, net									13,873	3,039	(22,320)
Deferred income tax benefit									20,272	2,579	(25,362)
Provision for (benefit from) income taxes	$ 8,812	$ 8,045	$ 5,927	$ 4,518	$ 84	$ 1,749	$ 1,734	$ 1,699	$ 27,302	$ 5,266	$ (21,114)