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Capital and Regulatory Matters - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Aug. 31, 2013
Feb. 28, 2013
Sep. 30, 2013
quarter
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
OTC Derivatives [Member]
Sep. 30, 2013
Basel I [Member]
Category
Sep. 30, 2013
Basel I [Member]
Risk Weighting Category One [Member]
Sep. 30, 2013
Basel I [Member]
Risk Weighting Category Two [Member]
Sep. 30, 2013
Basel I [Member]
Risk Weighting Category Three [Member]
Sep. 30, 2013
Basel I [Member]
Risk Weighting Category Four [Member]
Sep. 30, 2013
Commercial Real Estate Acquisition, Development and Construction Loans [Member]
Sep. 30, 2013
As Amended [Member]
Commercial Real Estate Acquisition, Development and Construction Loans [Member]
Sep. 30, 2013
Scenario, Forecast [Member]
Banking [Member]
Minimum [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Basel III [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Securities Lending Transactions [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Claims on Securities Firms [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Minimum [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Minimum [Member]
Basel III [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Maximum [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Maximum [Member]
Basel III [Member]
Sep. 30, 2013
2015 [Member]
Scenario, Forecast [Member]
Other Residential Mortgages [Member]
Sep. 30, 2013
2016 [Member]
Scenario, Forecast [Member]
Sep. 30, 2013
Floating Rate Subordinated Notes [Member]
Dec. 31, 2012
Floating Rate Subordinated Notes [Member]
Feb. 28, 2013
Non-Cumulative Perpetual Preferred Stock and Series A Preferred Stock [Member]
Feb. 15, 2013
Non-Cumulative Perpetual Preferred Stock and Series A Preferred Stock [Member]
Feb. 28, 2013
Non-Cumulative Perpetual Preferred Stock [Member]
Feb. 15, 2013
Non-Cumulative Perpetual Preferred Stock [Member]
Sep. 30, 2013
Series A Preferred Stock [Member]
Feb. 15, 2013
Series A Preferred Stock [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                                                                
Preferred stock value issued include for regulatory tier one capital calculations     $ 144,500,000                                                          
Preferred stock dividend rate percentage     5.375%                                                   5.375%      
Trust preferred securities     120,000,000                                                          
Corporation's aggregate subordinated notes     123,712,000   123,712,000                                       100,000,000              
Per Year Percentage decrease 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        
Preferred stock liquidation preference value                                                       150,000,000     25  
Preferred stock, par value     $ 0.01   $ 0.01                                                 $ 0.01    
Preferred stock liquidation preference                                                               $ 25
Net proceeds from the issuance and sale of the Preferred Stock     144,486,000 0                                             144,500,000          
Accelerated share repurchase program repurchase amount   144,000,000                                                            
Accelerated share repurchase program repurchase share 331,671 1,905,077                                                            
Accelerated share repurchase program repurchase share percent   80.00%                                                            
Stock repurchase program authorized amount     150,000,000                                                          
Maximum dividends available without prior regulatory approval     $ 231,500,000                                                          
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 upon full implementation                                     7.00%                          
Minimum ratio of Tier 1 capital to risk-weighted assets                             6.00%                                  
Minimum Tier 1 capital ratio upon full implementation                                     8.50%                          
Minimum ratio of Total capital to risk-weighted assets                             8.00%                                  
Minimum ratio of Total capital to risk-weighted assets                                     10.50%                          
Minimum leverage ratio                           3.00%         4.00%                          
Threshold of items deducted from CET1                             10.00%                                  
Threshold of Aggregate items deducted from CET1                             15.00%                                  
Percent of Trust Preferred Securities Included in Tier 1 Capital                             25.00%                 0.00%                
Implementation of the deductions and other adjustments to CET1, Percentage                             40.00%                                  
Implementation of the deductions and other adjustments to CET1, Additional Percentage                                               20.00%                
Implementation of the capital conservation buffer, Percentage                                               0.625%                
Capital conservation buffer phase in period                             4 years                 4 years                
Required CET1 ratio for well-capitalized status as per Basel III Capital Rules                             6.50%                                  
Minimum Tier 1 capital ratio for well-capitalized status     6.00%                               8.00%                          
Leverage ratio required for adequately capitalized     3.00%                                                          
Number of risk-weighting categories             4                                                  
Risk weightings percentage               0.00% 20.00% 50.00% 100.00% 100.00% 150.00%       20.00% 100.00%   0.00%   600.00% 150.00%                  
Credit conversion factor     0.00%                         20.00%                                
Original maturity period                                         1 year                      
Current cap on risk weight for derivatives           50.00%