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Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]    
Carrying value $ 1,231,500 $ 1,231,500
Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred stock, shares issued 230,000 230,000
Preferred stock, shares outstanding 230,000 230,000
Carrying value $ 230,000 $ 230,000
Series C Fixed Rate Cumulative Perpetual Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred stock, shares issued 151,500 151,500
Preferred stock, shares outstanding 151,500 151,500
Carrying value $ 151,500 $ 151,500
Series D Fixed Rate Non-Cumulative Perpetual Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred stock, shares issued 50,000 50,000
Preferred stock, shares outstanding 50,000 50,000
Carrying value $ 500,000 $ 500,000
Series E Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred stock, shares issued 350,000 350,000
Preferred stock, shares outstanding 350,000 350,000
Carrying value $ 350,000 $ 350,000