Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 6) (USD $)			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Total Troubled Debt Restructured Loans item	Jun. 30, 2012 Total Troubled Debt Restructured Loans item	Jun. 30, 2013 Total Troubled Debt Restructured Loans item	Jun. 30, 2012 Total Troubled Debt Restructured Loans item	Jun. 30, 2013 Commercial item	Jun. 30, 2012 Commercial item	Jun. 30, 2013 Commercial item	Jun. 30, 2012 Commercial item	Jun. 30, 2013 Commercial real estate mortgages item	Jun. 30, 2012 Commercial real estate mortgages item	Jun. 30, 2013 Commercial real estate mortgages item	Jun. 30, 2012 Commercial real estate mortgages item	Jun. 30, 2013 Home equity loans and lines of credit item	Jun. 30, 2012 Fixed item	Jun. 30, 2012 Construction item	Jun. 30, 2012 Construction item
Financing Receivable, Impaired
Troubled debt restructured loans on accrual	$ 54,300,000	$ 48,800,000
TDR loans	64,400,000	94,900,000
Specific Reserves	600,000	1,700,000
Number of Contracts			7	8	12	15	6	4	10	9	1	2	1	2	1	1	2	3
Pre-Modification Outstanding Principal			7,503,000	43,336,000	9,575,000	66,505,000	6,956,000	18,179,000	8,683,000	35,161,000	547,000	15,832,000	547,000	15,832,000	345,000	655,000	9,325,000	14,857,000
Period-End Outstanding Principal			$ 7,473,000	$ 43,305,000	$ 8,883,000	$ 62,641,000	$ 6,926,000	$ 18,148,000	$ 8,336,000	$ 32,351,000	$ 547,000	$ 15,832,000	$ 547,000	$ 15,832,000			$ 9,325,000	$ 14,458,000