Stockholders' Equity (Components of Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income, Net of Tax
Beginning balance		$ 2,370	$ (1,229)	$ (4,840)
Change		1,159	3,599	3,611
Ending balance	3,529	3,529	2,370	(1,229)
Change in unrealized gains, tax portion		405
Change in other than temporary impairment of securities, tax		139
Unrealized Gains (Losses) On Securities
Other Comprehensive Income, Net of Tax
Beginning balance		3,914	367	(3,422)
Change	617	617	3,547	3,789
Ending balance	4,531	4,531	3,914	367
Other Than Temporary Impairment of Securities
Other Comprehensive Income, Net of Tax
Beginning balance		(1,214)	(1,164)	(740)
Change	212	212	(50)	(424)
Ending balance	(1,002)	(1,002)	(1,214)	(1,164)
Change in Derivative Contracts
Other Comprehensive Income, Net of Tax
Beginning balance		(330)	(432)	(678)
Change	330	330	102	246
Ending balance	$ 0	$ 0	$ (330)	$ (432)