Allowance for Loan Losses Impaired Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended				12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Originated Loans
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 6,052	[1]	$ 4,136	[1]	$ 6,146	[1]
Impaired Financing Receivable, Recorded Investment	91,971	[1]	88,002	[1]	87,764	[1]
Impaired Financing Receivable, Unpaid Principal Balance	109,479	[1]	104,973	[1]	104,244	[1]
Impaired Financing Receivable, Average Recorded Investment	94,957	[1]	100,763	[1]	93,702	[1]
Originated Loans | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,411	[1]	3,826	[1]	2,503	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,740	[1]	7,887	[1]	6,679	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,484	[1]	11,842	[1]	7,256	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,744	[1]	3,650	[1]	5,551	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,798	[1]	5,526	[1]	7,428	[1]
Impaired Financing Receivable, Related Allowance			1,336	[1]	3,235	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,896	[1]	3,829	[1]	5,009	[1]
Originated Loans | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	16,576	[1]	15,836	[1]	17,871	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	22,625	[1]	21,921	[1]	23,709	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	17,035	[1]	18,884	[1]	18,639	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,021	[1]	3,920	[1]	2,744	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,022	[1]	4,251	[1]	2,870	[1]
Impaired Financing Receivable, Related Allowance			488	[1]	229	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,381	[1]	4,126	[1]	2,836	[1]
Originated Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[1]	958	[1]	906	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	[1]	1,237	[1]	1,179	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	[1]	1,851	[1]	1,035	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	[1]	0	[1]	0	[1]
Impaired Financing Receivable, Related Allowance			0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	0	[1]	0	[1]
Originated Loans | Installment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,899	[1]	3,051	[1]	2,813	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,001	[1]	4,344	[1]	3,978	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,959	[1]	3,521	[1]	3,338	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	19,676	[1]	25,528	[1]	24,472	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	20,314	[1]	25,616	[1]	24,558	[1]
Impaired Financing Receivable, Related Allowance			552	[1]	1,014	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	20,039	[1]	26,172	[1]	24,985	[1]
Originated Loans | Home equity lines
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,015	[1]	1,046	[1]	1,018	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,045	[1]	1,386	[1]	1,347	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,073	[1]	1,107	[1]	1,079	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,609	[1]	5,869	[1]	5,707	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,829	[1]	5,869	[1]	5,707	[1]
Impaired Financing Receivable, Related Allowance			197	[1]	223	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,779	[1]	6,017	[1]	5,874	[1]
Originated Loans | Consumer Credit Card
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	27	[1]	48	[1]	49	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	27	[1]	48	[1]	49	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	44	[1]	74	[1]	91	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	885	[1]	1,205	[1]	1,064	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	885	[1]	1,205	[1]	1,064	[1]
Impaired Financing Receivable, Related Allowance			261	[1]	312	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	981	[1]	1,352	[1]	1,238	[1]
Originated Loans | Consumer Residential Mortgages Financing Receivable
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	12,576	[1]	10,363	[1]	10,250	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,552	[1]	12,899	[1]	12,778	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,720	[1]	10,122	[1]	10,258	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	13,532	[1]	12,702	[1]	12,816	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	13,641	[1]	12,784	[1]	12,898	[1]
Impaired Financing Receivable, Related Allowance			1,302	[1]	1,133	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	13,566	[1]	11,866	[1]	12,064	[1]
Originated Loans | Total impaired loans with no related allowance
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	43,504	[1]	35,128	[1]	35,410	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	59,990	[1]	49,722	[1]	49,719	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	48,315	[1]	47,401	[1]	41,696	[1]
Originated Loans | Total impaired loans with a related allowance
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	48,467	[1]	52,874	[1]	52,354	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	49,489	[1]	55,251	[1]	54,525	[1]
Impaired Financing Receivable, Related Allowance	6,052	[1]	4,136	[1]	6,146	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	46,642	[1]	53,362	[1]	52,006	[1]
Originated Loans
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	6,052
Originated Loans | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	1,399
Originated Loans | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	1,620
Originated Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 0

[1] Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.