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Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 2,655,314  
Corporate debt securities 2,592,823  
Corporate Debt Securities Issued by Financial Institutions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 97,392 $ 92,379
Corporate debt securities 97,980 93,335
Single-issuer Trust Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 31,352 31,335
Corporate debt securities 30,513 30,703
Subordinated Debt    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 54,011 49,013
Corporate debt securities 54,357 49,533
Senior Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,029 12,031
Corporate debt securities 12,245 12,392
Pooled Trust Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0 0
Corporate debt securities 865 707
Other Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,975 3,974
Corporate debt securities 3,975 3,974
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 101,367 96,353
Corporate debt securities $ 101,955 $ 97,309