Allowance for Loan and Lease Losses Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Financing Receivable, TDR Modifications, Number of Contracts	25	45	50	101
Financing Receivable, TDR Modifications, Pre-Modification Recorded Investment	$ 20,759	$ 21,932	$ 37,968	$ 45,810
Financing Receivable, TDR Modifications, Post-Modification Recorded Investment	20,771	21,952	37,987	45,868
Financing Receivable, TDR Modifications, Subsequent Default, Number of Contracts	10	9	11	19
Financing Receivable, TDR Modifications, Subsequent Default, Recorded Investment	7,512	3,546	7,658	7,600
Financing Receivables Troubled Debt Restructurings Recorded Investment Current	87,557		87,557		85,905
Financing Receivables Troubled Debt Restructurings Recorded Investment 30 to 89 Past Due and Accruing	5,909		5,909		6,723
Financing Receivables Troubled Debt Restructurings Recorded Investment 90 days and greater Past Due and Accruing	0		0		0
Financing Receivables Troubled Debt Restructurings Recorded Investment Nonaccrual Status	63,135		63,135		59,780
Financing Receivables Troubled Debt Restructurings Recorded Investment	156,601		156,601		152,408
Financing Receivables Troubled Debt Restructurings Recorded Investment Impaired	156,601		156,601		152,408
Valuation Allowance on Troubled Debt Restructurings	10,322		10,322		9,743
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, TDR Modifications, Number of Contracts	17	39	33	81
Financing Receivable, TDR Modifications, Pre-Modification Recorded Investment	7,693	16,120	13,707	34,444
Financing Receivable, TDR Modifications, Post-Modification Recorded Investment	7,705	16,140	13,726	34,502
Financing Receivable, TDR Modifications, Subsequent Default, Number of Contracts	8	7	9	15
Financing Receivable, TDR Modifications, Subsequent Default, Recorded Investment	2,965	3,287	3,111	4,619
Financing Receivables Troubled Debt Restructurings Recorded Investment	89,791		89,791		90,927
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, TDR Modifications, Number of Contracts	1	2	4	3
Financing Receivable, TDR Modifications, Pre-Modification Recorded Investment	0	233	2,954	2,851
Financing Receivable, TDR Modifications, Post-Modification Recorded Investment	0	233	2,954	2,851
Financing Receivable, TDR Modifications, Subsequent Default, Number of Contracts	1	1	1	3
Financing Receivable, TDR Modifications, Subsequent Default, Recorded Investment	860	230	860	2,952
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, TDR Modifications, Number of Contracts	7	4	13	17
Financing Receivable, TDR Modifications, Pre-Modification Recorded Investment	13,066	5,579	21,307	8,515
Financing Receivable, TDR Modifications, Post-Modification Recorded Investment	13,066	5,579	21,307	8,515
Financing Receivable, TDR Modifications, Subsequent Default, Number of Contracts	1	1	1	1
Financing Receivable, TDR Modifications, Subsequent Default, Recorded Investment	3,687	29	3,687	29
Commercial and commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivables Troubled Debt Restructurings Recorded Investment	$ 66,810		$ 66,810		$ 61,481