Allowance for Credit Losses - Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011 Loans	Jun. 30, 2011 Loans	Jun. 30, 2012	Jun. 30, 2012 Owner occupied Real estate Loans		Jun. 30, 2012 Owner occupied Real estate Loans
Financing Receivable, Modifications [Line Items]
Reserves specific to modified loans			$ 2,136
Commitments for additional lending to customers with modified loans			800
Number of Loans	0	0		2		2
Pre-Modification Outstanding Recorded Investment				500	[1]	500	[1]
Principal Modification				0	[2]	0	[2]
Post Modification Outstanding Recorded Investment				500	[3]	500	[3]
Outstanding Recorded Investment				$ 500		$ 500

[1] Amounts represent the recorded investment in loans before recognizing effects of the TDR, if any.

[2] Principal Modification includes principal forgiveness at the time of modification, contingent principal forgiveness granted over the life of the loan based on borrower performance, and principal that has been legally separated and deferred to the end of the loan, with zero percent contractual interest rate.

[3] Balance outstanding after principal modification, if any borrower reduction to recorded investment.