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Junior Subordinated Debentures (Narrative) (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Subordinated Borrowing [Line Items]      
Percentage ownership interest in subsidiary trusts 100.00%    
Common securities, approximate percentage of junior subordinated debentures 3.00%    
Trust preferred securities, approximate percentage of junior subordinated debentures 97.00%    
Junior subordinated debentures $ 249,493,000 $ 249,493,000 $ 249,493,000
Debt, Weighted Average Interest Rate 4.88%    
Interest rate swaps to hedge variable cash flows $ 225,000,000    
Consecutive quarters of deferred payment 20    
Junior Subordinated Debt [Member]
     
Subordinated Borrowing [Line Items]      
Debt, Weighted Average Interest Rate 2.47%