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Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Reported Value Measurement [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Reported Value Measurement [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Reported Value Measurement [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Held-to-maturity Securities [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Held-to-maturity Securities [Member]
Reported Value Measurement [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Held-to-maturity Securities [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Held-to-maturity Securities [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Held-to-maturity Securities [Member]
Significant Unobservable Input (Level 3) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Alternative Investments [Member]
Significant Unobservable Input (Level 3) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Investments Held In Rabbi Trust [Member]
Significant Unobservable Input (Level 3) [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Significant Unobservable Input (Level 3) [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Held-to-maturity Securities [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Held-to-maturity Securities [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Held-to-maturity Securities [Member]
Significant Unobservable Input (Level 3) [Member]
Sep. 30, 2013
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
DepositsOtherThanTimeDeposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Reported Value Measurement [Member]
Sep. 30, 2013
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Sep. 30, 2013
Minimum [Member]
Range Seven [Member]
Sep. 30, 2013
Minimum [Member]
Range Two [Member]
Sep. 30, 2013
Minimum [Member]
Range Eight [Member]
Sep. 30, 2013
Minimum [Member]
Range Nine [Member]
Sep. 30, 2013
Maximum [Member]
Range Seven [Member]
Sep. 30, 2013
Maximum [Member]
Range Two [Member]
Sep. 30, 2013
Maximum [Member]
Range Eight [Member]
Sep. 30, 2013
Maximum [Member]
Range Nine [Member]
Sep. 30, 2013
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Dec. 31, 2012
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Sep. 30, 2013
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2012
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2013
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Dec. 31, 2012
Alternative Investments [Member]
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Input (Level 3) [Member]
Fair Value Measurements [Line Items]                                                                                                                                                                        
Percentage Of Unobservable Inputs For Level Three Assets And Liabilities Measured At Fair Value                                                                                                                                         25.00% 3.00% 6.70% 3.10% 50.00% 8.00% 26.60% 6.00%                
Available-for-sale Securities                           $ 3,193,772,000                                                                                                                                            
Securities available for sale 2,622,575,000 685,797,000   3,193,772,000 3,136,160,000   9,314,000 8,282,000 3,154,494,000 3,013,131,000 29,964,000 114,747,000 3,136,160,000   9,314,000 8,282,000 3,154,494,000 3,013,131,000 29,964,000 114,747,000 3,107,529,000   0 3,264,718,000 0                                                 0 3,248,620,000 0                                                                
Loans held for sale 40,193,000 107,633,000                                                                                                                                                                    
Loans Held-for-sale, Fair Value Disclosure                                                                                   40,193,000 107,633,000 0 0 0 0 40,193,000 107,633,000                                                                      
Loans and Leases Receivable, Net Amount 12,320,420,000 11,851,567,000                                                                               12,320,420,000                                                                                    
Loans Receivable, Fair Value Disclosure                                                                                     11,851,567,000 0 0 0 0 12,410,295,000 12,005,555,000                                                                      
Held-to-maturity Securities 3,205,999,000                                         3,205,999,000                                                                                                                            
Mortgage servicing assets                                                                                       0 [1] 0 [1] 0 [1] 0 [1] 25,496,000 [1] 15,881,000 [1]                                                                      
Alternative investments                                                   19,048,000 19,523,000 0 0 0 0 19,048,000 19,523,000 5,909,000 5,741,000 5,909,000 5,741,000                                                                                   804,000 1,533,000             804,000 1,533,000
Derivative instruments       38,517,000 53,867,000   0 0 38,517,000 53,867,000 0 0                                                                                                                                                
Deposits other than time deposits                                                                                                         12,741,904,000 11,985,683,000 0 0 12,741,904,000 11,985,683,000 0 0 2,545,152,000   0 0 2,280,333,000 2,584,921,000 0 0                                
Time Deposits Fair Value Disclosure                                                                                                                           2,257,627,000                                            
Securities sold under agreements to repurchase and other borrowings 1,372,290,000 1,076,160,000 1,372,290,000                                                                                                                                                                  
Securities sold under agreements to repurchase and other borrowings         1,076,160,000   0 0 1,404,532,000 1,134,614,000 0 0                                                                                                                                                
Long-term Federal Home Loan Bank Advances           1,602,469,000 [2]                                                                                                                                                            
Federal Home Loan Bank advances         1,827,612,000 [2]   0 [2] 0 [2] 1,636,387,000 [2] 1,843,615,000 [2] 0 [2] 0 [2]                                                                                                                                                
Long-term debt 229,146,000 334,276,000       229,146,000 [3]                                                                                                                                                            
Long-term debt         334,276,000 [3]   0 [3] 0 [3] 224,097,000 [3] 298,807,000 [3] 0 [3] 0 [3]                                                                                                                                                
Derivative instruments       27,584,000 43,301,000   187,000 125,000 27,397,000 43,176,000 0 0                                                                                                                                                
Mortgage servicing assets, reserves 400,000 1,800,000                                                                                                                                                                    
Hedge accounting adjustments and discounts 67,000 85,000                                                                                                                                                                    
Hedge Accounting Adjustments And Discounts - Long Term Debt $ 1,800,000 $ 4,400,000                                                                                                                                                                    
[1] The carrying amount of mortgage servicing assets is net of $0.4 million and $1.8 million reserves at September 30, 2013 and December 31, 2012, respectively. The estimated fair value does not include such adjustments.
[2] The carrying amount of FHLB advances is net of $67 thousand and $85 thousand in unamortized premiums at September 30, 2013 and December 31, 2012, respectively. The estimated fair value does not include such adjustments.
[3] The carrying amount of long-term debt is net of $1.8 million and $4.4 million in hedge accounting adjustments and discounts at September 30, 2013 and December 31, 2012, respectively. The estimated fair value does not include such adjustments.