Loan Servicing (Activity For MSRs And Related Valuation Allowance) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Servicing Asset at Amortized Value, Balance [Roll Forward]
Carrying amount, net, beginning of period	$ 8,809	$ 10,259	$ 9,301	$ 10,488	$ 10,488
Additions	981	431	2,240	1,070
Amortization	(900)	(621)	(2,605)	(1,557)
Changes in valuation inputs & assumptions	(544)	0	(590)	68
Carrying amount, net, end of period	8,346	10,069	8,346	10,069	9,301
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance, beginning of period	1,067	680	1,021	748	748
Changes in valuation allowance	544	0	590	(68)	273
Valuation allowance, end of period	$ 1,611	$ 680	$ 1,611	$ 680	$ 1,021