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Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 2,408,077  
Corporate debt securities 2,412,805  
Corporate Debt Securities Issued by Financial Institutions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 98,249 $ 97,109
Corporate debt securities 95,893 96,127
Single-issuer Trust Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 46,624 47,569
Corporate debt securities 41,787 42,016
Subordinated Debt    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 51,625 47,530
Corporate debt securities 53,576 50,023
Pooled Trust Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 0 2,010
Other Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 4,048 1,907
Corporate debt securities 4,048 1,907
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 102,297 99,016
Corporate debt securities $ 99,941 $ 98,034