Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Loan	Sep. 30, 2012 Loan	Sep. 30, 2013 Loan	Sep. 30, 2012 Loan
Troubled Debt Restructurings
Troubled debt restructurings, Number of Loans	9	46	50	149
Troubled debt restructurings, Pre-modification recorded balance	$ 2,926	$ 38,125	$ 12,016	$ 66,580
Troubled debt restructurings, Post-modification recorded balance	3,141	35,475	12,418	61,944
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	3	10	17
Financing Receivable Modifications Subsequent Defaults Recorded Investment	363	1,792	2,772	10,204
Residential Real Estate
Troubled Debt Restructurings
Troubled debt restructurings, Number of Loans	2	1	9	9
Troubled debt restructurings, Pre-modification recorded balance	284	280	1,907	1,981
Troubled debt restructurings, Post-modification recorded balance	499	281	2,293	1,982
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	2	1	2
Financing Receivable Modifications Subsequent Defaults Recorded Investment	0	1,622	265	1,622
Commercial Real Estate
Troubled Debt Restructurings
Troubled debt restructurings, Number of Loans	4	21	17	61
Troubled debt restructurings, Pre-modification recorded balance	2,481	20,866	7,137	37,712
Troubled debt restructurings, Post-modification recorded balance	2,481	18,242	7,137	33,080
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	4	10
Financing Receivable Modifications Subsequent Defaults Recorded Investment	0	0	1,918	7,553
Other Commercial
Troubled Debt Restructurings
Troubled debt restructurings, Number of Loans	0	19	17	60
Troubled debt restructurings, Pre-modification recorded balance	0	16,601	2,572	25,033
Troubled debt restructurings, Post-modification recorded balance	0	16,571	2,588	25,025
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0	5	3
Financing Receivable Modifications Subsequent Defaults Recorded Investment	363	0	589	801
Home Equity
Troubled Debt Restructurings
Troubled debt restructurings, Number of Loans	1	2	2	9
Troubled debt restructurings, Pre-modification recorded balance	57	219	147	1,314
Troubled debt restructurings, Post-modification recorded balance	57	222	147	1,317
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1	0	1
Financing Receivable Modifications Subsequent Defaults Recorded Investment	0	170	0	170
Other Consumer
Troubled Debt Restructurings
Troubled debt restructurings, Number of Loans	2	3	5	10
Troubled debt restructurings, Pre-modification recorded balance	104	159	253	540
Troubled debt restructurings, Post-modification recorded balance	104	159	253	540
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	1
Financing Receivable Modifications Subsequent Defaults Recorded Investment	$ 0	$ 0	$ 0	$ 58