Fair Value Measurements (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Total realized/unrealized gains (losses):
Paydowns received on Level 3 assets measured on a recurring basis	$ 2,000,000	$ 1,400,000
Securities Available-for-Sale
Level 3 Assets Measured on a Recurring Basis
Balance, beginning of period	20,982,000	26,779,000
Total realized/unrealized gains (losses):
Included in other comprehensive income	348,000	(4,952,000)
Settlements	(1,960,000)	(1,407,000)
Other	(20,000)	(124,000)
Balance, end of period	$ 19,350,000	$ 20,296,000