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Loans (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 07, 2013
Acquired From FDIC [Member]
Mountain National Bank [Member]
Sep. 30, 2014
Permanent Mortgage Portfolio Segment [Member]
Sep. 30, 2013
Permanent Mortgage Portfolio Segment [Member]
Sep. 30, 2014
Permanent Mortgage Portfolio Segment [Member]
Sep. 30, 2013
Permanent Mortgage Portfolio Segment [Member]
Jun. 30, 2014
Permanent Mortgage Portfolio Segment [Member]
Dec. 31, 2013
Permanent Mortgage Portfolio Segment [Member]
Jun. 30, 2013
Permanent Mortgage Portfolio Segment [Member]
Dec. 31, 2012
Permanent Mortgage Portfolio Segment [Member]
Sep. 30, 2014
Loans Held For Sale [Member]
Sep. 30, 2013
Loans Held For Sale [Member]
Sep. 30, 2014
Residential Real Estate [Member]
Sep. 30, 2014
Consumer Real Estate Portfolio Segment [Member]
Sep. 30, 2013
Consumer Real Estate Portfolio Segment [Member]
Sep. 30, 2014
Consumer Real Estate Portfolio Segment [Member]
Sep. 30, 2013
Consumer Real Estate Portfolio Segment [Member]
Jun. 30, 2014
Consumer Real Estate Portfolio Segment [Member]
Dec. 31, 2013
Consumer Real Estate Portfolio Segment [Member]
Jun. 30, 2013
Consumer Real Estate Portfolio Segment [Member]
Dec. 31, 2012
Consumer Real Estate Portfolio Segment [Member]
Sep. 30, 2014
Modified Loans Classified As Tdr [Member]
Sep. 30, 2013
Modified Loans Classified As Tdr [Member]
Sep. 30, 2014
Loans To Mortgage Companies [Member]
Sep. 30, 2013
Loans To Mortgage Companies [Member]
Sep. 30, 2014
Commercial Portfolio Segment [Member]
Sep. 30, 2013
Commercial Portfolio Segment [Member]
Sep. 30, 2014
Commercial Portfolio Segment [Member]
Sep. 30, 2013
Commercial Portfolio Segment [Member]
Sep. 30, 2014
Credit Card And Other Portfolio Segment [Member]
Sep. 30, 2013
Credit Card And Other Portfolio Segment [Member]
Sep. 30, 2014
Credit Card And Other Portfolio Segment [Member]
Sep. 30, 2013
Credit Card And Other Portfolio Segment [Member]
Jun. 30, 2014
Credit Card And Other Portfolio Segment [Member]
Dec. 31, 2013
Credit Card And Other Portfolio Segment [Member]
Jun. 30, 2013
Credit Card And Other Portfolio Segment [Member]
Dec. 31, 2012
Credit Card And Other Portfolio Segment [Member]
Sep. 30, 2014
Credit Card Class [Member]
Sep. 30, 2013
Credit Card Class [Member]
Sep. 30, 2014
Heloc And Real Estate Installment Classes [Member]
Sep. 30, 2014
Restricted And Secured Consumer Real Estate Loans [Member]
Dec. 31, 2013
Restricted And Secured Consumer Real Estate Loans [Member]
Sep. 30, 2013
Restricted And Secured Consumer Real Estate Loans [Member]
Dec. 31, 2013
Restricted And Secured Permanent Mortgage Real Estate Loans [Member]
Sep. 30, 2013
Restricted And Secured Permanent Mortgage Real Estate Loans [Member]
Sep. 30, 2014
Finance And Insurance Companies [Member]
Sep. 30, 2014
Finance Insurance And Loans To Mortgage Companies [Member]
Sep. 30, 2014
Maximum [Member]
Permanent Mortgage Portfolio Segment [Member]
Sep. 30, 2014
Maximum [Member]
Commercial Portfolio Segment [Member]
Sep. 30, 2014
Maximum [Member]
Credit Card Class [Member]
Sep. 30, 2014
Maximum [Member]
Heloc And Real Estate Installment Classes [Member]
Sep. 30, 2014
Minimum [Member]
Non Accruing [Member]
Sep. 30, 2014
Minimum [Member]
Permanent Mortgage Portfolio Segment [Member]
Sep. 30, 2014
Minimum [Member]
Credit Card Class [Member]
Sep. 30, 2014
Minimum [Member]
Heloc And Real Estate Installment Classes [Member]
Sep. 30, 2014
Pass
Maximum [Member]
number
Sep. 30, 2014
Pass
Minimum [Member]
number
Sep. 30, 2014
Special Mention
number
Sep. 30, 2014
Substandard
number
Sep. 30, 2014
Doubtful
number
Sep. 30, 2014
Unlikely to be Collected Financing Receivable
Maximum [Member]
number
Sep. 30, 2014
Commercial Loan P D Grade One [Member]
number
Sep. 30, 2013
Commercial Loan P D Grade One [Member]
Sep. 30, 2014
Commercial Loan P D Grade Twelve [Member]
Sep. 30, 2013
Commercial Loan P D Grade Twelve [Member]
Sep. 30, 2014
Commercial Loan P D Grade Thirteen [Member]
Sep. 30, 2013
Commercial Loan P D Grade Thirteen [Member]
Sep. 30, 2014
Commercial Loan P D Grade Thirteen [Member]
Minimum [Member]
Sep. 30, 2014
Commercial Loan L G D Grade One [Member]
Minimum [Member]
number
Sep. 30, 2014
Commercial Loan L G D Grade Twelve [Member]
Maximum [Member]
number
Sep. 30, 2014
Loan Reassessed [Member]
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]                                                                                                                                                            
Percentage of commercial & industrial loan portfolio                                                             11.00%                                           22.00% 33.00%                                                
Concentration risk, percentage                                       36.00%     32.00%               6.00%                                           12.00%                                                  
Impaired commercial loans                                                                                                                     $ 1,000,000                                      
Troubled debt restructurings loans 346,000,000 369,400,000 346,000,000 369,400,000                           83,100,000 133,900,000                                                                                                                      
Allowance for loan losses 238,641,000 255,710,000 238,641,000 255,710,000 243,628,000 253,809,000 261,934,000 276,963,000   20,221,000 25,556,000 20,221,000 25,556,000 23,727,000 22,491,000 27,103,000 24,928,000       118,395,000 120,826,000 118,395,000 120,826,000 118,037,000 126,785,000 120,848,000 128,949,000 60,900,000 61,300,000     85,320,000 102,373,000 [1] 85,320,000 102,373,000 [1] 14,705,000 6,955,000 14,705,000 6,955,000 17,452,000 7,484,000 6,550,000 6,898,000                                                 0 81,000 1,383,000 2,425,000 6,716,000 8,596,000        
Ratio of the allowance for loan losses to loans                                                         18.00% 17.00%                                                                                                
Average balance of impaired loans 367,299,000 450,082,000 377,673,000 452,424,000                                                         72,053,000 149,472,000 82,311,000 159,348,000                                                                                    
Interest income recognized on impaired loan 1,668,000 1,811,000 5,015,000 5,271,000                                                         200,000 209,000 645,000 686,000                                                                                    
Commercial loans                                                             957,641,000 732,701,000 9,755,723,000 8,872,800,000 [1] 9,755,723,000 8,872,800,000 [1]                                 1,900,000,000                                           500,000     1,000,000
Forbearance agreements time period     6 months                                                                                                         12 months                                            
TDR, reduction of interest rate by increment, basis points                   0.25%   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 15,812,017,000 15,408,556,000 15,812,017,000 15,408,556,000   15,389,074,000       572,789,000 697,694,000 [2] 572,789,000 697,694,000 [2]   662,242,000 [2]           5,130,988,000 [3] 5,458,047,000 [3] 5,130,988,000 [3] 5,458,047,000 [3]   5,333,371,000 [3]         957,641,000 732,701,000         352,517,000 332,162,000 352,517,000 332,162,000   336,606,000     188,372,000 189,487,000   81,100,000 333,800,000 349,300,000 11,200,000 11,700,000                                                    
Loans acquired                 249,000,000                                                                                                                                          
Modified interest rate increase                   1.00%   1.00%                                                                                                                                    
Provision for loan losses 6,000,000 10,000,000 21,000,000 40,000,000           (3,145,000) (1,022,000) (84,000) 5,596,000               8,154,000 11,992,000 9,300,000 35,737,000                         84,000 2,535,000 16,014,000 6,211,000                                                                            
Loan loss provision on PCI loans 400,000   2,100,000                                                                                                                                                      
Allowance - purchased credit-impaired loans $ 2,839,000   $ 2,839,000             $ 0   $ 0                 $ 58,000   $ 58,000                   $ 2,781,000   $ 2,781,000   $ 0   $ 0                                                                              
Lowest expected default probability                                                                                                                                         1                  
[1]

September 30, 2013 table excludes PCI loans.
[2]

Balances as of September 30, 2013, and December 31, 2013 include $11.7 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[3]

Balances as of September 30, 2014 and 2013, and December 31, 2013 include $81.1 million, $349.3 million, and $333.8 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.