Loans Receivable and Allowance for Loan Losses (Loans Receivable Modified as Troubled Debt Restructurings, Previous 12 Months) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Contracts	Jun. 30, 2012 QTD [Member] Contracts	Jun. 30, 2011 QTD [Member] Contracts	Jun. 30, 2012 YTD [Member] Contracts	Jun. 30, 2011 YTD [Member] Contracts	Jun. 30, 2012 Less Than 30 Days Past Due [Member] YTD [Member] Contracts	Jun. 30, 2012 Commercial and industrial [Member] QTD [Member] Contracts	Jun. 30, 2011 Commercial and industrial [Member] QTD [Member] Contracts	Jun. 30, 2012 Commercial and industrial [Member] YTD [Member] Contracts	Jun. 30, 2011 Commercial and industrial [Member] YTD [Member] Contracts	Jun. 30, 2012 Commercial tax-exempt [Member] QTD [Member] Contracts	Jun. 30, 2011 Commercial tax-exempt [Member] QTD [Member] Contracts	Jun. 30, 2012 Commercial tax-exempt [Member] YTD [Member] Contracts	Jun. 30, 2011 Commercial tax-exempt [Member] YTD [Member] Contracts	Jun. 30, 2012 Owner occupied real estate [Member] QTD [Member] Contracts	Jun. 30, 2011 Owner occupied real estate [Member] QTD [Member] Contracts	Jun. 30, 2012 Owner occupied real estate [Member] YTD [Member] Contracts	Jun. 30, 2011 Owner occupied real estate [Member] YTD [Member] Contracts	Jun. 30, 2012 Commercial construction and land development [Member] QTD [Member] Contracts	Jun. 30, 2011 Commercial construction and land development [Member] QTD [Member] Contracts	Jun. 30, 2012 Commercial construction and land development [Member] YTD [Member] Contracts	Jun. 30, 2011 Commercial construction and land development [Member] YTD [Member] Contracts	Jun. 30, 2012 Commercial real estate [Member] QTD [Member] Contracts	Jun. 30, 2011 Commercial real estate [Member] QTD [Member] Contracts	Jun. 30, 2012 Commercial real estate [Member] YTD [Member] Contracts	Jun. 30, 2011 Commercial real estate [Member] YTD [Member] Contracts	Jun. 30, 2012 Residential [Member] QTD [Member] Contracts	Jun. 30, 2011 Residential [Member] QTD [Member] Contracts	Jun. 30, 2012 Residential [Member] YTD [Member] Contracts	Jun. 30, 2011 Residential [Member] YTD [Member] Contracts	Jun. 30, 2012 Consumer [Member] QTD [Member] Contracts	Jun. 30, 2011 Consumer [Member] QTD [Member] Contracts	Jun. 30, 2012 Consumer [Member] YTD [Member] Contracts	Jun. 30, 2011 Consumer [Member] YTD [Member] Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts	13	4	1	16	3	10	1	0	2	2	0	0	0	0	0	0	1	0	1	0	5	0	0	0	4	0	1	1	3	1	1	0	1	0
Recorded Investment	$ 6,200	$ 584	$ 194	$ 7,668	$ 8,470	$ 5,500	$ 2	$ 0	$ 180	$ 8,276	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 82	$ 0	$ 211	$ 0	$ 3,239	$ 0	$ 0	$ 0	$ 3,366	$ 0	$ 194	$ 194	$ 624	$ 194	$ 177	$ 0	$ 177	$ 0
TDR contracts in payment default, period	30 days