Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	$ 413,397		$ 658,838
Recorded Investment	313,389		573,606
Related Allowance	96,577		115,928
Impaired Financing Receivable, Average Recorded Investment	375,177		772,300		607,700
Interest income on impaired loans	5,562	[1]	27,400		26,500
Real-estate commercial mortage
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	100,529		111,190
Recorded Investment	79,566		104,069
Related Allowance	36,060		17,995
Impaired Financing Receivable, Average Recorded Investment	79,831
Interest income on impaired loans	1,270	[1]
Commercial - Secured [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	61,970		202,824
Recorded Investment	47,652		197,674
Related Allowance	26,248		64,922
Impaired Financing Receivable, Average Recorded Investment	78,380
Interest income on impaired loans	1,231	[1]
Commercial - Unsecured [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	3,139		8,681
Recorded Investment	2,789		8,603
Related Allowance	2,177		4,191
Impaired Financing Receivable, Average Recorded Investment	3,864
Interest income on impaired loans	34	[1]
Real Estate - Home Equity [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	5,294		0
Recorded Investment	5,294		0
Related Allowance	3,076		0
Impaired Financing Receivable, Average Recorded Investment	1,952
Interest income on impaired loans	0	[1]
Real-estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	39,918	[1]	18,518	[1]
Recorded Investment	39,918	[1]	18,518	[1]
Related Allowance	16,295	[1]	5,950	[1]
Impaired Financing Receivable, Average Recorded Investment	53,610	[1]
Interest income on impaired loans	1,458	[1]
Construction - Commercial Residential [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	41,176		110,465
Recorded Investment	25,632		103,826
Related Allowance	11,287		22,155
Impaired Financing Receivable, Average Recorded Investment	47,529
Interest income on impaired loans	457	[1]
Construction - Commercial [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	3,221		2,642
Recorded Investment	1,049		2,642
Related Allowance	506		715
Impaired Financing Receivable, Average Recorded Investment	1,090
Interest income on impaired loans	17	[1]
Construction other [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	1,127		0
Recorded Investment	1,127		0
Related Allowance	663		0
Impaired Financing Receivable, Average Recorded Investment	1,100
Interest income on impaired loans	1	[1]
Consumer - Direct [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	368		0
Recorded Investment	368		0
Related Allowance	228		0
Impaired Financing Receivable, Average Recorded Investment	189
Interest income on impaired loans	2	[1]
Leasing and Other and Overdrafts [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	56		0
Recorded Investment	56		0
Related Allowance	37		0
Impaired Financing Receivable, Average Recorded Investment	59
Interest income on impaired loans	0	[1]
Subtotal [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	256,798		454,320
Recorded Investment	203,451		435,332
Related Allowance	96,577		115,928
Impaired Financing Receivable, Average Recorded Investment	267,604
Interest income on impaired loans	4,470	[1]
Real-estate - home equity
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	199		0
Recorded Investment	199		0
Impaired Financing Receivable, Average Recorded Investment	80
Interest income on impaired loans	0	[1]
Real-estate commercial mortage
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	54,445		68,583
Recorded Investment	46,768		54,251
Impaired Financing Receivable, Average Recorded Investment	44,486
Interest income on impaired loans	647	[1]
Commercial - Secured [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	35,529		38,366
Recorded Investment	28,440		27,745
Impaired Financing Receivable, Average Recorded Investment	30,829
Interest income on impaired loans	182	[1]
Commercial - Unsecured [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	0		710
Recorded Investment	0		587
Impaired Financing Receivable, Average Recorded Investment	177
Interest income on impaired loans	3	[1]
Real-estate - residential mortgage
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	0	[1]	21,598	[1]
Recorded Investment	0	[1]	21,212	[1]
Impaired Financing Receivable, Average Recorded Investment	4,242	[1]
Interest income on impaired loans	43	[1]
Construction - Commercial Residential [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	62,822		69,624
Recorded Investment	31,233		32,354
Impaired Financing Receivable, Average Recorded Investment	24,770
Interest income on impaired loans	195	[1]
Construction - Commercial [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	3,604		5,637
Recorded Investment	3,298		2,125
Impaired Financing Receivable, Average Recorded Investment	2,989
Interest income on impaired loans	22	[1]
Subtotal [Member]
Impaired Financing Receivables [Line Items]
Unpaid Principal Balance	156,599		204,518
Recorded Investment	109,938		138,274
Impaired Financing Receivable, Average Recorded Investment	107,573
Interest income on impaired loans	$ 1,092	[1]

[1] Effective April 1, 2011, all impaired loans, excluding certain accruing TDRs, were non-accrual loans.