Income Taxes (Narrative) (Details) (USD $)	3 Months Ended			12 Months Ended
	Sep. 30, 2010	Sep. 30, 2009	Mar. 31, 2008	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Tax Liability Not Recognized [Line Items]
Reserve for unrecognized tax benefits	$ 620,000	$ 650,000	$ 700,000	$ (623,000)	$ (652,000)	$ (706,000)
Unrecognized tax benefit liability includes interest	210,000	50,000	50,000
Unrecognized tax benefits resulting in net operating loss carryforward				350,000
AMT credit carry forwards				25,765,000	25,509,000
Net operating loss carryforwards				52,500,000	63,700,000
Interest and penalties				(200,000)	300,000	0
Accrued for interest and penalties				1,400,000	1,600,000
Low incomehousing credit carryforwards				4,100,000	3,600,000
Other deferred income tax expense				13,873,000	3,039,000	(22,320,000)
Other-Than-Temporary Impairment [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense						(9,451,000)
Housing Credit Carryforwards [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense					(1,823,000)
Tax Credit Caryforwards [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense					(1,781,000)	(9,076,000)
Loan [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense				6,562,000
Benefit Plan Accrual [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense				(4,929,000)	4,762,000	(3,024,000)
Premises And Equipment [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense				3,816,000	2,058,000
OREO [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense				2,382,000
Net Operating Loss [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense						(2,897,000)
Lease Receivable [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense				(2,498,000)
Purchase Accounting [Member]
Deferred Tax Liability Not Recognized [Line Items]
Other deferred income tax expense				$ 7,782,000