Loans and Allowance for Credit Losses Average Impaired Loans by Class Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 92,444		$ 103,394
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	272	[1]	107	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	174,008		204,012
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	667	[1]	551	[1]
Impaired Financing Receivable, Average Recorded Investment	266,452		307,406
Impaired Financing Receivable, Interest Income, Accrual Method	939	[1]	658	[1]
Real-estate commercial mortage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	32,140		43,647
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	160	[1]	71	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	54,464		74,889
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	221	[1]	122	[1]
Commercial - Secured [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	31,413		25,060
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	34	[1]	7	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	35,864		50,065
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	43	[1]	13	[1]
Commercial - unsecured [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	66		7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,743		2,915
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	[1]	1	[1]
Real-estate - home equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	205		350
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	13,301		5,576
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	16	[1]	0	[1]
Real-estate - residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	991		246
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12	[1]	2	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	53,797		40,088
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	339	[1]	390	[1]
Construction - Commercial Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	22,650		30,863
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	63	[1]	25	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11,496		27,062
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	42	[1]	22	[1]
Construction - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,979		3,221
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	[1]	2	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,758		2,035
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	[1]	2	[1]
Construction other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	533		1,150
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[1]	1	[1]
Consumer - direct [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24		188
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[1]	0	[1]
Leasing and other and overdrafts [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	28		44
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0	[1]	$ 0	[1]

[1] All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three months ended March 31, 2013 and 2012 represents amounts earned on accruing TDRs.