Other Real Estate Owned (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Activity for other real estate owned [Roll Forward]
Beginning balance of other real estate owned	$ 56,435,000	$ 46,791,000	$ 56,965,000	$ 42,935,000
New assets acquired	3,045,000	14,613,000	10,540,000	25,551,000
Capitalized costs	359,000	192,000	527,000	253,000
Fair value adjustments	(540,000)	(713,000)	(899,000)	(2,890,000)
Sale of assets	(3,196,000)	(2,879,000)	(11,030,000)	(7,845,000)
Ending balance of other real estate owned	56,103,000	58,004,000	56,103,000	58,004,000
Foreclosed properties	55,600,000	58,000,000	55,600,000	58,000,000
Other real estate owned not acquired through foreclosure	600,000		600,000
Carrying cost and fair value adjusments for foreclosed properties	$ 1,100,000	$ 1,500,000	$ 2,700,000	$ 4,500,000