Fair Value Measurements (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Total realized/unrealized gains (losses):
Paydowns received on Level 3 assets measured on a recurring basis	$ 1,700,000	$ 200,000
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	1,585,000	(1,358,000)
Settlements	(1,728,000)	(221,000)
Other	(33,000)	(56,000)
Balance, end of period	$ 20,806,000	$ 25,144,000