Goodwill And Other Intangible Assets (Other Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets, Net [Abstract]
Gross carryinng amount	$ 56,451,000	$ 56,451,000
Accumulated amortization	(51,302,000)	(47,926,000)
Impairment	0	0
Net	5,149,000	8,525,000
Amortization of intangible assets	3,400,000	3,900,000	4,200,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Aggregate estimated amortization expense in 2013	1,700,000
Aggregate estimated amortization expense in 2014	1,200,000
Aggregate estimated amortization expense in 2015	1,000,000
Aggregate estimated amortization expense in 2016	466,000
Aggregate estimated amortization expense in 2017	212,000
Purchased Trust Revenues [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carryinng amount	4,210,000	4,210,000
Accumulated amortization	(3,251,000)	(2,970,000)
Impairment	0	0
Net	959,000	1,240,000
Acquired Customer Contracts [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carryinng amount	5,270,000	5,270,000
Accumulated amortization	(5,262,000)	(5,241,000)
Impairment	0	0
Net	8,000	29,000
Core Deposit Premiums [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carryinng amount	46,331,000	46,331,000
Accumulated amortization	(42,457,000)	(39,433,000)
Impairment	0	0
Net	3,874,000	6,898,000
Other [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carryinng amount	640,000	640,000
Accumulated amortization	(332,000)	(282,000)
Impairment	0	0
Net	$ 308,000	$ 358,000