Fair Value Measurements (Details 3) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Total realized/unrealized gains (losses):
Paydowns received on Level 3 assets measured on a recurring basis	$ 1,700,000	$ 1,700,000
Securities Available-for-Sale
Level 3 Assets Measured on a Recurring Basis
Balance, beginning of period	19,583,000	20,982,000
Total realized/unrealized gains (losses):
Included in other comprehensive income	1,221,000	1,585,000
Settlements	(1,664,000)	(1,728,000)
Transfers into level 3	47,165,000
Other	46,000	(33,000)
Balance, end of period	$ 66,351,000	$ 20,806,000