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RELATED-PARTY TRANSACTIONS - Transactions with St. Cloud Affiliates (Details) - USD ($)
Nov. 24, 2014
Sep. 30, 2016
Dec. 31, 2015
Feb. 14, 2012
Related Party Transaction [Line Items]        
Deposits   $ 9,078,319,000 $ 6,303,085,000  
Limited Liability Company        
Related Party Transaction [Line Items]        
Common stock, shares outstanding (in shares)       700,538
Percentage of total shares outstanding     1.80%  
Limited partnership, required ownership interest (less than) 9.90%      
Deposits   $ 128,000    
Limited Liability Company | Minimum        
Related Party Transaction [Line Items]        
Limited partnership, expected investment $ 5,000,000      
Limited Liability Company | Maximum        
Related Party Transaction [Line Items]        
Limited partnership, expected investment $ 7,500,000