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Loans (Narrative) (Details) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 07, 2013 Acquired From FDIC [Member] Mountain National Bank [Member] | Mar. 31, 2014 Permanent Mortgage Portfolio Segment [Member] | Mar. 31, 2013 Permanent Mortgage Portfolio Segment [Member] | Dec. 31, 2013 Permanent Mortgage Portfolio Segment [Member] | Dec. 31, 2012 Permanent Mortgage Portfolio Segment [Member] | Mar. 31, 2014 Loans Held For Sale [Member] | Mar. 31, 2013 Loans Held For Sale [Member] | Mar. 31, 2014 Residential Real Estate [Member] | Mar. 31, 2014 Consumer Real Estate Portfolio Segment [Member] | Mar. 31, 2013 Consumer Real Estate Portfolio Segment [Member] | Dec. 31, 2013 Consumer Real Estate Portfolio Segment [Member] | Dec. 31, 2012 Consumer Real Estate Portfolio Segment [Member] | Mar. 31, 2014 Modified Loans Classified As Tdr [Member] | Mar. 31, 2013 Modified Loans Classified As Tdr [Member] | Mar. 31, 2014 Loans To Mortgage Companies [Member] | Mar. 31, 2013 Loans To Mortgage Companies [Member] | Mar. 31, 2014 Commercial Portfolio Segment [Member] | Mar. 31, 2013 Commercial Portfolio Segment [Member] | Mar. 31, 2014 Credit Card And Other Portfolio Segment [Member] | Mar. 31, 2013 Credit Card And Other Portfolio Segment [Member] | Dec. 31, 2013 Credit Card And Other Portfolio Segment [Member] | Dec. 31, 2012 Credit Card And Other Portfolio Segment [Member] | Mar. 31, 2014 Credit Card Class [Member] | Mar. 31, 2013 Credit Card Class [Member] | Mar. 31, 2014 Heloc And Real Estate Installment Classes [Member] | Mar. 31, 2014 Restricted And Secured Consumer Real Estate Loans [Member] | Dec. 31, 2013 Restricted And Secured Consumer Real Estate Loans [Member] | Mar. 31, 2013 Restricted And Secured Consumer Real Estate Loans [Member] | Dec. 31, 2013 Restricted And Secured Permanent Mortgage Real Estate Loans [Member] | Mar. 31, 2013 Restricted And Secured Permanent Mortgage Real Estate Loans [Member] | Mar. 31, 2014 Finance And Insurance Companies [Member] | Mar. 31, 2014 Finance Insurance And Loans To Mortgage Companies [Member] | Mar. 31, 2014 Maximum [Member] Permanent Mortgage Portfolio Segment [Member] | Mar. 31, 2014 Maximum [Member] Commercial Portfolio Segment [Member] | Mar. 31, 2014 Maximum [Member] Credit Card Class [Member] | Mar. 31, 2014 Maximum [Member] Heloc And Real Estate Installment Classes [Member] | Mar. 31, 2014 Minimum [Member] Non Accruing [Member] | Mar. 31, 2014 Minimum [Member] Permanent Mortgage Portfolio Segment [Member] | Mar. 31, 2014 Minimum [Member] Commercial Portfolio Segment [Member] | Mar. 31, 2014 Minimum [Member] Credit Card Class [Member] | Mar. 31, 2014 Minimum [Member] Heloc And Real Estate Installment Classes [Member] | Mar. 31, 2014 Pass Maximum [Member] number | Mar. 31, 2014 Pass Minimum [Member] number | Mar. 31, 2014 Special Mention number | Mar. 31, 2014 Substandard number | Mar. 31, 2014 Doubtful number | Mar. 31, 2014 Unlikely to be Collected Financing Receivable Maximum [Member] number | Mar. 31, 2014 Commercial Loan P D Grade One [Member] number | Mar. 31, 2013 Commercial Loan P D Grade One [Member] | Mar. 31, 2014 Commercial Loan P D Grade Twelve [Member] | Mar. 31, 2013 Commercial Loan P D Grade Twelve [Member] | Mar. 31, 2014 Commercial Loan P D Grade Thirteen [Member] | Mar. 31, 2013 Commercial Loan P D Grade Thirteen [Member] | Mar. 31, 2014 Commercial Loan P D Grade Thirteen [Member] Minimum [Member] | Mar. 31, 2014 Commercial Loan L G D Grade One [Member] Minimum [Member] number | Mar. 31, 2014 Commercial Loan L G D Grade Twelve [Member] Maximum [Member] number | Mar. 31, 2014 Loan Reassessed [Member] Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of commercial & industrial loan portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% | 35.00% |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired commercial loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructurings loans | 353,400,000 | 352,400,000 |  |  |  |  |  |  |  |  |  |  | 137,000,000 | 128,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses | 247,246,000 | 265,218,000 | 253,809,000 | 276,963,000 |  | 22,521,000 |  | 25,448,000 |  | 22,491,000 |  | 24,928,000 |  |  |  | 123,409,000 |  | 131,417,000 |  | 126,785,000 |  | 128,949,000 | 65,800,000 | 64,600,000 |  |  | 86,367,000 | [1] | 101,243,000 | 13,061,000 | 7,110,000 | 7,484,000 | 6,898,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000 | 51,000 | 2,403,000 | 2,808,000 | 7,968,000 | 8,371,000 |  |  |  |
Ratio of the allowance for loan losses to loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.00% | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average balance of impaired loans | 391,004,000 | 458,291,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,696,000 |  | 168,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income recognized on impaired loan | 1,681,000 | 1,631,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 244,000 |  | 229,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 709,552,000 | 1,130,079,000 | 8,859,764,000 | [2] | 9,207,065,000 |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  | 1,000,000
Forbearance agreements time period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TDR, reduction of interest rate by increment, basis points |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modified interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modified interest rate time period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TDRS Maturities |  |  |  |  |  | 40 years |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment reductions, time period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit card workout program, granted rate reduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit card workout program, term extension |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 1 | 13 | 14 | 15 | 16 |  |  |  |  |  |  |  | 1 | 12 |
Time period of default probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | 15,119,461,000 | 15,889,670,000 | 15,389,074,000 |  |  | 622,242,000 | [3] | 793,282,000 | [3] | 662,242,000 | [3] |  |  |  |  | 5,258,014,000 | [4] | 5,590,180,000 | [4] | 5,333,371,000 | [4] |  |  |  | 709,552,000 | 1,130,079,000 |  |  |  | 333,792,000 | 299,143,000 | 336,606,000 |  | 183,443,000 | 181,223,000 |  | 86,700,000 | 333,800,000 | 386,400,000 | 11,200,000 | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  | 249,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modified interest rate increase |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses | 10,000,000 | 15,000,000 |  |  |  | 1,670,000 |  | 3,763,000 |  |  |  |  |  |  |  | 3,914,000 |  | 20,960,000 |  |  |  |  |  |  |  |  |  |  |  | 8,657,000 | 2,547,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan loss provision on PCI loans | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance - purchased credit impaired loans | $ 1,899,000 |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lowest expected default probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
[1] | Allowance excludes $1.9 million related to PCI loans as of March 31, 2014.
[2] | Balance as of March 31, 2014, excludes PCI loans amounting to $45.6 million.
[3] | Balances as of March 31, 2013, and December 31, 2013 include $13.0 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.
[4] | Balances as of March 31, 2014 and 2013, and December 31, 2013 include $86.7 million, $386.4 million, and $333.8 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition 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=28368275&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=28368275&loc=d3e5258-111524 + Details
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