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RELATED-PARTY TRANSACTIONS - Transactions Involving Underwriting Services (Details) - USD ($)
May 11, 2016
Mar. 08, 2016
Feb. 08, 2016
Apr. 08, 2015
Apr. 06, 2015
May 21, 2014
Jun. 30, 2016
Related Party Transaction [Line Items]              
Expenses from transactions with related parties         $ 263,000    
Expenses from transactions with related parties, net of related expenses         221,000    
Preferred stock, liquidation preference per share (in dollars per share)             $ 1,000
Common Stock              
Related Party Transaction [Line Items]              
Issuance of stock shares 5,250,000 4,850,000          
Senior Notes | 5.25% Senior Notes Due April 15, 2025              
Related Party Transaction [Line Items]              
Aggregate principal amount issued         $ 175,000,000    
Stated interest rate         5.25%    
Director | Underwriting Fees              
Related Party Transaction [Line Items]              
Expenses from transactions with related parties     $ 944,000 $ 590,000      
Expenses from transactions with related parties, net of related expenses     $ 849,000 $ 515,000      
Director | Underwriting Fees | Common Stock              
Related Party Transaction [Line Items]              
Expenses from transactions with related parties   $ 1,000,000       $ 521,000  
Expenses from transactions with related parties, net of related expenses   $ 846,000       $ 481,000  
Series E 7.00% non-cumulative perpetual              
Related Party Transaction [Line Items]              
Depository shares to preferred stock ratio     2.50%        
Non cumulative preferred stock, dividend rate     7.00%        
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000        
Offering price per share (in dollars per share)     $ 25        
Series D 7.375% non-cumulative perpetual              
Related Party Transaction [Line Items]              
Depository shares to preferred stock ratio       2.50%      
Non cumulative preferred stock, dividend rate       7.375%      
Preferred stock, liquidation preference per share (in dollars per share)       $ 1,000      
Offering price per share (in dollars per share)       $ 25      
Underwritten Public Offering              
Related Party Transaction [Line Items]              
Depository shares issued (in shares)     5,000,000 4,600,000      
Offering price per share (in dollars per share)     $ 25 $ 25      
Underwritten Public Offering | Common Stock              
Related Party Transaction [Line Items]              
Issuance of stock shares   5,577,500       5,922,500  
Underwritten Public Offering | Series E 7.00% non-cumulative perpetual              
Related Party Transaction [Line Items]              
Depository shares issued (in shares)     5,000,000        
Depository shares to preferred stock ratio     2.50%        
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000        
Underwritten Public Offering | Series D 7.375% non-cumulative perpetual              
Related Party Transaction [Line Items]              
Depository shares to preferred stock ratio       2.50%      
Preferred stock, liquidation preference per share (in dollars per share)       $ 1,000