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, 2013 Contracts	Jun. 30, 2013 YTD [Member] Contracts	Jun. 30, 2013 Less Than 30 Days Past Due [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Residential [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Residential [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Residential [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Residential [Member] YTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Consumer [Member] QTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Consumer [Member] QTD [Member] Contracts	Jun. 30, 2013 TDR's, Subsequently Defaulted [Member] Consumer [Member] YTD [Member] Contracts	Jun. 30, 2012 TDR's, Subsequently Defaulted [Member] Consumer [Member] YTD [Member] Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts	20	22	16	16	4	22	16	9	1	10	2	0	0	0	0	2	0	2	1	2	1	3	5	3	0	4	4	0	1	1	3	0	1	2	1
Recorded Investment			$ 17,500	$ 13,331	$ 584	$ 20,772	$ 7,668	$ 6,151	$ 2	$ 6,390	$ 180	$ 0	$ 0	$ 0	$ 0	$ 1,610	$ 0	$ 1,610	$ 82	$ 2,628	$ 211	$ 6,119	$ 3,239	$ 2,942	$ 0	$ 6,217	$ 3,366	$ 0	$ 194	$ 259	$ 624	$ 0	$ 177	$ 177	$ 177
TDR contracts in payment default, period	30 days