Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$ 132,702	$ 156,599
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	94,451	109,938
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	100,345	107,573
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	839	1,092
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	214,981	256,798
Impaired Financing Receivable, with Related Allowance, Recorded Investment	175,889	203,451
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	188,026	267,604
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2,481	4,470
Unpaid Principal Balance	347,683	413,397
Recorded Investment	270,340	313,389
Related Allowance	79,175	96,577
Impaired Financing Receivable, Average Recorded Investment	288,371	375,177	772,300
Interest income on impaired loans	3,320	5,562	27,400
Leasing and Other and Overdrafts [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10	56
Impaired Financing Receivable, with Related Allowance, Recorded Investment	10	56
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	83	59
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0
Related Allowance	7	37
Construction other [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	576	1,127
Impaired Financing Receivable, with Related Allowance, Recorded Investment	576	1,127
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	974	1,100
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	1
Related Allowance	326	663
Real Estate - Home Equity [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	300	199
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	300	199
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	433	80
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,843	5,294
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,843	5,294
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,017	1,952
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	23	0
Related Allowance	8,380	3,076
Consumer - Direct [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	29	368
Impaired Financing Receivable, with Related Allowance, Recorded Investment	29	368
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	84	189
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	2
Related Allowance	25	228
Real-estate commercial mortage
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	44,649	54,445
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	34,189	46,768
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	41,575	44,486
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	538	647
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	69,173	100,529
Impaired Financing Receivable, with Related Allowance, Recorded Investment	55,443	79,566
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	64,739	79,831
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	755	1,270
Related Allowance	21,612	36,060
Commercial - Secured [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	40,409	35,529
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	30,112	28,440
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	26,443	30,829
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	50	182
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	52,660	61,970
Impaired Financing Receivable, with Related Allowance, Recorded Investment	39,114	47,652
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	45,217	78,380
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	97	1,231
Related Allowance	17,187	26,248
Commercial - Unsecured [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	132	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	131	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	52	177
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	3
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,142	3,139
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,083	2,789
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,604	3,864
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	34
Related Allowance	1,597	2,177
Real-estate - residential mortgage
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	486	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	486	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	989	4,242
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	45	43
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	53,610	39,918
Impaired Financing Receivable, with Related Allowance, Recorded Investment	53,610	39,918
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	44,791	53,610
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,446	1,458
Related Allowance	24,108	16,295
Construction - Commercial Residential [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	40,432	62,822
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	23,548	31,233
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	27,361	24,770
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	185	195
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	21,336	41,176
Impaired Financing Receivable, with Related Allowance, Recorded Investment	9,831	25,632
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	19,284	47,529
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	130	457
Related Allowance	4,787	11,287
Construction - Commercial [Member]
Impaired Financing Receivables [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,294	3,604
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,685	3,298
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,492	2,989
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	19	22
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,602	3,221
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,350	1,049
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,233	1,090
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	17	17
Related Allowance	$ 1,146	$ 506

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant