Fair Value Measurements (Details 3) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Total realized/unrealized gains (losses):
Paydowns received on Level 3 assets measured on a recurring basis	$ 3,700,000	$ 1,700,000
Securities Available-for-Sale
Level 3 Assets Measured on a Recurring Basis
Balance, beginning of period	65,187,000	19,583,000
Total realized/unrealized gains (losses):
Included in other comprehensive income	233,000	1,221,000
Settlements	(3,655,000)	(1,664,000)
Transfers into level 3		47,165,000
Other (1)	74,000	46,000
Balance, end of period	$ 61,839,000	$ 66,351,000