Premises And Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 157,290,000	$ 156,709,000
Less: Accumulated depreciation/amortization	51,329,000	47,253,000
Premises and equipment, net	105,961,000	109,456,000
Depreciation/amortization included in operating expense	6,100,000	4,600,000	7,700,000
Land And Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	33,429,000	33,429,000
Building And Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	72,608,000	73,541,000
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	37,445,000	36,621,000
Leasehold Improvement [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	12,494,000	12,216,000
Construction In Process [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 1,314,000	$ 902,000