Loans Receivable and Allowance for Loan Losses (Loans Receivable Modified as Troubled Debt Restructurings, Previous 12 Months) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 Contracts	Sep. 30, 2013 YTD [Member] Contracts	Sep. 30, 2013 Less Than 30 Days Past Due [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial and industrial [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial tax-exempt [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Owner occupied real estate [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial construction and land development [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Commercial real estate [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Residential [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Residential [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Residential [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Residential [Member] YTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Consumer [Member] QTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Consumer [Member] QTD [Member] Contracts	Sep. 30, 2013 TDR's, Subsequently Defaulted [Member] Consumer [Member] YTD [Member] Contracts	Sep. 30, 2012 TDR's, Subsequently Defaulted [Member] Consumer [Member] YTD [Member] Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts	20	21	13	3	2	21	12	1	1	10	2	0	0	0	0	0	0	2	0	0	0	2	4	0	0	3	2	1	1	2	3	1	0	2	1
Recorded Investment			$ 13,000	$ 3,745	$ 67	$ 15,923	$ 4,550	$ 179	$ 2	$ 5,051	$ 177	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1,580	$ 0	$ 0	$ 0	$ 2,426	$ 2,575	$ 0	$ 0	$ 2,943	$ 1,011	$ 3,089	$ 65	$ 3,348	$ 609	$ 477	$ 0	$ 575	$ 178
TDR contracts in payment default, period	30 days