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Investment Securities (Schedule of Maturities of Investment Securities Available-For-Sale) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost $ 881,469 $ 840,584
Available-for-Sale, Fair Value 910,055 859,362
Within One Year [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 8,889 [1] 7,916 [1]
Available-for-Sale, Fair Value 8,941 [1] 7,966 [1]
After One Year But Within Five Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 42,447 32,225
Available-for-Sale, Fair Value 42,729 32,465
After Five Years but Within Ten Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 273,536 129,597
Available-for-Sale, Fair Value 282,968 135,649
After Ten Years [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 556,597 670,846
Available-for-Sale, Fair Value $ 575,417 $ 683,282
[1] Reverse mortgages do not have contractual maturities. We have included reverse mortgages in maturities within one year.