Loans (Impaired Loans) (Details) (USD $)	3 Months Ended
	Sep. 30, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired loans, held for sale	$ 0		$ 4,529,000
Impaired loans, no individually reviewed for impairment	7,274,000		5,127,000
Impaired loans, individually reviewed, with no impairment	72,402,000		53,884,000
Impaired loans, individually reviewed, with impairment	14,769,000		42,357,000
Total impaired loans, excluding purchased impaired	94,445,000	[1]	105,897,000	[1]
Purchased impaired loans with subsequent deterioration	31,801,000		0
Purchased impaired loans with no subsequent deterioration	220,404,000		330,836,000
Impaired loan, individually reviewed, with impairment, associated reserves	4,522,000	[1]	11,090,000	[1]
Purchased impaired loans with subsequent deterioration, associated reserves	3,296,000		0
Impaired financing receivable, including deteriorated loans purchased, related allowance	7,818,000		11,090,000
Imparied financing receivable, simple average balance	98,567,000		112,600,000
Restructured loans	21,400,000		28,300,000
Performing [Member]
Financing Receivable, Impaired [Line Items]
Restructured loans	$ 3,600,000		$ 2,900,000

[1] Included at September 30, 2012 and December 31, 2011 were $3.6 million and $2.9 million, respectively, in restructured and performing loans.