Allowance for Loan Losses, Summary of Impaired and Non-accrual Loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of non-performing assets
Non-accrual Loans	$ 16,435	$ 80,760
Non-accrual Loans Held-for-Sale	907	0
Loans 90 Days Past Due and Still Accruing	0	0
Other Real Estate Owned	1,572	1,800
Total Non-performing Assets	18,914	82,560
TDRs accruing interest	9,954	1,496
TDRs - nonaccruing	6,650	24,979
Additional interest income for the non-accrual loans outstanding at the end of the reported periods	$ 854	$ 4,300	$ 1,500