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Capital and Regulatory Matters (Narrative) (Detail) (USD $)
 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Aug. 13, 2013
Feb. 12, 2013
Dec. 31, 2013
quarter
Dec. 31, 2012
Dec. 31, 2013
Over the Counter [Member]
Dec. 31, 2013
Basel One [Member]
Category
Dec. 31, 2013
Basel One [Member]
Risk Weighting Category One [Member]
Dec. 31, 2013
Basel One [Member]
Risk Weighting Category Two [Member]
Dec. 31, 2013
Basel One [Member]
Risk Weighting Category Three [Member]
Dec. 31, 2013
Basel One [Member]
Risk Weighting Category Four [Member]
Dec. 31, 2013
Other Loans [Member]
Dec. 31, 2013
As Amended [Member]
Other Loans [Member]
Dec. 31, 2013
Scenario, Forecast [Member]
Banking [Member]
Minimum [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Basel Three [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Securities Lending Activities [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Claims On Securities Firms [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Minimum [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Minimum [Member]
Basel Three [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Maximum [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Maximum [Member]
Basel Three [Member]
Dec. 31, 2013
Two Thousand And Fifteen [Member]
Scenario, Forecast [Member]
Other Residential Mortgages [Member]
Dec. 31, 2013
Two Thousand And Sixteen [Member]
Scenario, Forecast [Member]
Feb. 15, 2013
Non Cumulative Perpetual Preferred Stock And Seriesa Preferred Stock [Member]
Feb. 15, 2013
Non Cumulative Perpetual Preferred Stock [Member]
Dec. 31, 2013
Series A Preferred Stock [Member]
Feb. 15, 2013
Series A Preferred Stock [Member]
Dec. 31, 2013
Floating Rate Subordinated Notes [Member]
Dec. 31, 2012
Floating Rate Subordinated Notes [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                                                          
Non-cumulative perpetual preferred stock     $ 144,500,000                                                    
Non-cumulative perpetual preferred stock, dividend rate percentage     5.375%                                           5.375%        
Trust preferred securities     120,000,000 120,000,000                                                  
Corporation's aggregate subordinated notes     123,712,000 123,712,000                                               100,000,000  
Per year percentage of decreases in permissible portion of Subordinate Note included in Total Capital                                                       20.00%  
Final years of the term of the notes                                                       5 years  
Permissible portion of subordinated note included in total capital                                                       60,000,000 80,000,000
Preferred stock, shares issued     6,000,000 0                                       6,000,000          
Series A Preferred Stock, Liquidation preference value                                               150,000,000   25      
Preferred stock, par value     $ 0.01 $ 0.01                                         $ 0.01        
Liquidation preference per share                                                     $ 25    
Issuance of preferred stock     144,486,000                                         144,500,000          
Accelerated share repurchase authorized amount     150,000,000                                                    
Amount paid under accelerated share repurchase agreement   144,000,000                                                      
Shares repurchased under accelerated share repurchase program 331,671 1,905,077                                                      
Accelerated Share Repurchase Program Repurchase Share Percent   80.00%                                                      
Aggregate dividends available for payment without prior regulatory approval     $ 294,700,000                                                    
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures     20                                                    
Minimum ratio of CET1 to risk-weighted assets                           4.50%                              
Capital conservation buffer                           2.50%                              
Minimum ratio of CET1 to risk-weighted assets                                   7.00%                      
Minimum ratio of Tier 1 capital to risk-weighted assets                           6.00%                              
Minimum Tier 1 capital ratio                                   8.50%                      
Minimum ratio of Total capital to risk weighted assets                           8.00%                              
Minimum total capital ratio                                   10.50%                      
Minimum leverage ratio                         3.00%         4.00%                      
Risk weighted threshold of items deducted from common equity tier one capital                           10.00%                              
Aggregate risk weighted threshold of items deducted from common equity tier one capital                           15.00%                              
Trust preferred securities included in tier one capital, percentage                           25.00%                 0.00%            
Tier One Risk Based Capital Conservation Buffer Initial Requirements Phasing Duration                           4 years                 4 years            
Implementation of deductions and other adjustments to CET1, percentage                           40.00%                              
Implementation of deductions and other adjustments To CET1 additional, percentage                                             20.00%            
Implementation of Tier one capital conservation buffer to risk weighted assets required under regulatory                                             0.625%            
Required CET1 Ratio for well-capitalized status as per basel III capital rules                           6.50%                              
Minimum tier one capital ratio to be considered well capitalized     6.00%                             8.00%                      
Tier one leverage ratio expected to be maintained     3.00%                                                    
Number of risk weighting categories           4                                              
Risk weighting percentage             0.00% 20.00% 50.00% 100.00% 100.00% 150.00%       20.00% 100.00%   0.00%   600.00% 150.00%              
Minimum number of days to be considered past due     90 days                                     90 days              
Credit conversion factor     0.00%                       20.00%                            
Original maturity period                                       1 year                  
Current percentage of cap on risk weight for derivatives         50.00%