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SECURITIES - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investment Holdings [Line Items]      
Held-to-maturity securities, unrecognized holding gain | $ $ 9,000 $ 954  
Proceeds from sales of securities available for sale | $ 421,843 41,169 $ 143,488
Available-for-sale securities, accumulated gross unrealized loss before tax | $ 10,299 10,412  
Securities available for sale, at fair value | $ 1,209,537 1,154,457  
Level 2      
Investment Holdings [Line Items]      
Securities available for sale, at fair value | $ $ 1,147,253 1,120,824  
Municipal bonds and obligations      
Investment Holdings [Line Items]      
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 3.40%    
Number of HTM investment securities in unrealized loss positions (security) 53    
Number of securities in the portfolio of HTM (security) 199    
Collateralized mortgage obligations      
Investment Holdings [Line Items]      
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 2.70%    
Number of HTM investment securities in unrealized loss positions (security) 1    
Number of securities in the portfolio of HTM (security) 9    
Mortgage-backed Securities      
Investment Holdings [Line Items]      
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 3.50%    
Number of HTM investment securities in unrealized loss positions (security) 2    
Number of securities in the portfolio of HTM (security) 2    
Corporate bonds | One Investment | Level 2      
Investment Holdings [Line Items]      
Securities available for sale, at fair value | $ $ 16,800    
Debt securities | Municipal bonds and obligations      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 16    
Available for sale securities portfolio, number of securities (security) 271    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 7.10%    
Debt securities | Collateralized mortgage obligations      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 71    
Available for sale securities portfolio, number of securities (security) 218    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 1.00%    
Debt securities | Mortgage-backed Securities      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 52    
Available for sale securities portfolio, number of securities (security) 105    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 2.00%    
Debt securities | Corporate bonds      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 3    
Available for sale securities portfolio, number of securities (security) 11    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 2.90%    
Debt securities | Corporate bonds | One Investment      
Investment Holdings [Line Items]      
Available-for-sale securities, accumulated gross unrealized loss before tax | $ $ 700    
Securities available for sale, at fair value | $ $ 17,500    
Debt securities | Trust preferred securities      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 1    
Available for sale securities portfolio, number of securities (security) 3    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 4.60%    
Debt securities | Other bonds and obligations      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 5    
Available for sale securities portfolio, number of securities (security) 9    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 0.50%    
Marketable equity securities      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 7    
Available for sale securities portfolio, number of securities (security) 27    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 11.40%    
Net unrealized holding gain on AFS securities      
Investment Holdings [Line Items]      
Other accumulated comprehensive income/(loss), before tax | $ $ 25,176 6,316  
Income tax benefit related to items of accumulated other comprehensive income/(loss) | $ 9,636 2,437  
Net unrealized holding gain on AFS securities | Securities Available for Sale      
Investment Holdings [Line Items]      
Other accumulated comprehensive income/(loss), before tax | $ $ 16,200 $ 5,300