Allowance for Loan Losses Impaired Financing Receivables (Details) (Originated Loans [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended				12 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 6,468	[1]	$ 10,991	[1]	$ 5,004	[1]
Impaired Financing Receivable, Recorded Investment	96,286	[1],[2]	121,282	[1],[2]	96,371	[1],[2]
Impaired Financing Receivable, Unpaid Principal Balance	113,529	[1],[2]	139,889	[1],[2]	122,187	[1],[2]
Impaired Financing Receivable, Average Recorded Investment	105,308	[1]	120,478	[1]	116,779	[1]
C&I
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,031	[1],[2]	18,773	[1],[2]	3,098	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,423	[1],[2]	22,139	[1],[2]	14,473	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,075	[1]	16,455	[1]	12,533	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,408	[1],[2]	6,477	[1],[2]	3,089	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,553	[1],[2]	10,511	[1],[2]	4,943	[1],[2]
Impaired Financing Receivable, Related Allowance	3,169	[1]	5,327	[1]	577	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	10,469	[1]	6,641	[1]	4,231	[1]
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	17,021	[1],[2]	20,426	[1],[2]	19,664	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	23,892	[1],[2]	26,942	[1],[2]	26,402	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	19,143	[1]	21,586	[1]	23,911	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,379	[1],[2]	12,718	[1],[2]	4,343	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,416	[1],[2]	14,817	[1],[2]	4,927	[1],[2]
Impaired Financing Receivable, Related Allowance	1,010	[1]	1,977	[1]	913	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,558	[1]	11,007	[1]	3,834	[1]
Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,005	[1],[2]	4,218	[1],[2]	2,684	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,282	[1],[2]	6,810	[1],[2]	3,306	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,294	[1]	4,956	[1]	3,861	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[1],[2]	987	[1],[2]	721	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	[1],[2]	987	[1],[2]	721	[1],[2]
Impaired Financing Receivable, Related Allowance	0	[1]	115	[1]	105	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	991	[1]	730	[1]
Installment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,464	[1],[2]	0	[1],[2]	2,527	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,882	[1],[2]	0	[1],[2]	3,947	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,838	[1]	0	[1]	4,251	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	26,676	[1],[2]	31,043	[1],[2]	28,343	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	26,772	[1],[2]	31,043	[1],[2]	28,706	[1],[2]
Impaired Financing Receivable, Related Allowance	557	[1]	1,773	[1]	1,526	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	27,032	[1]	31,581	[1]	29,583	[1]
Home equity lines
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,158	[1],[2]	0	[1],[2]	642	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,481	[1],[2]	0	[1],[2]	849	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,217	[1]	0	[1]	860	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,661	[1],[2]	6,063	[1],[2]	5,639	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,661	[1],[2]	6,063	[1],[2]	5,639	[1],[2]
Impaired Financing Receivable, Related Allowance	197	[1]	22	[1]	34	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,784	[1]	6,192	[1]	5,924	[1]
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	57	[1],[2]	0	[1],[2]	467	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	57	[1],[2]	0	[1],[2]	467	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	76	[1]	0	[1]	568	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,205	[1],[2]	1,998	[1],[2]	1,145	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,205	[1],[2]	1,998	[1],[2]	1,145	[1],[2]
Impaired Financing Receivable, Related Allowance	255	[1]	128	[1]	127	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,310	[1]	2,159	[1]	1,311	[1]
Consumer Residential Mortgages Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,682	[1],[2]	4,411	[1],[2]	9,578	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,294	[1],[2]	4,411	[1],[2]	12,142	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,934	[1]	4,718	[1]	10,645	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,539	[1],[2]	14,168	[1],[2]	14,431	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,611	[1],[2]	14,168	[1],[2]	14,520	[1],[2]
Impaired Financing Receivable, Related Allowance	1,280	[1]	1,649	[1]	1,722	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,578	[1]	14,192	[1]	14,537	[1]
Total impaired loans with no related allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	34,418	[1],[2]	47,828	[1],[2]	38,660	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	48,311	[1],[2]	60,302	[1],[2]	61,586	[1],[2]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	40,577	[1]	47,715	[1]	56,629	[1]
Total impaired loans with a related allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	61,868	[1],[2]	73,454	[1],[2]	57,711	[1],[2]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	65,218	[1],[2]	79,587	[1],[2]	60,601	[1],[2]
Impaired Financing Receivable, Related Allowance	6,468	[1]	10,991	[1]	5,004	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$ 64,731	[1]	$ 72,763	[1]	$ 60,150	[1]

[1] These tables exclude loans fully charged off.

[2] The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.