Fair Value Measurements Assets Measured at Fair Value on a Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified																												12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Total [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 1 [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 1 [Member] Other Assets [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 1 [Member] Other Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member] Other Assets [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member] Other Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Other Assets [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Other Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Total [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Total [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Total [Member] Other Assets [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Total [Member] Other Assets [Member]	Dec. 31, 2010 Pooled Trust Preferred Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2010 Single-issuer Trust Preferred Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2010 Auction Rate Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3																												$ 0	$ 650
Net loans												0	0			0	0			216,812	457,678			216,812	457,678
Other finanical assets														0	0			0	0			63,919	62,109			63,919	62,109
Total Assets				13,130	13,582	3,901	9,256	0	0	17,031	22,838	0	0			0	0			280,731	519,787			280,731	519,787
Reserve for unfunded commitments	$ 1,706	$ 1,227	$ 855									$ 0	$ 0			$ 0	$ 0			$ 1,706	$ 1,227			$ 1,706	$ 1,227