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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND OTHER - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
Investment Holdings [Line Items]    
Securities available for sale and other, at fair value | $ $ 1,460,660 $ 1,426,099
Municipal bonds and obligations    
Investment Holdings [Line Items]    
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 2.50%  
Held-to-maturity, securities in unrealized loss positions (security) 73  
Held-to-maturity securities portfolio, number of securities (security) 227  
Municipal bonds and obligations | Debt securities    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 13  
Available for sale securities portfolio, number of securities (security) 258  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 5.30%  
Agency collateralized mortgage obligations    
Investment Holdings [Line Items]    
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 4.10%  
Held-to-maturity, securities in unrealized loss positions (security) 4  
Held-to-maturity securities portfolio, number of securities (security) 9  
Agency collateralized mortgage obligations | Debt securities    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 229  
Available for sale securities portfolio, number of securities (security) 243  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 2.20%  
Mortgage-backed securities    
Investment Holdings [Line Items]    
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 4.50%  
Held-to-maturity, securities in unrealized loss positions (security) 2  
Held-to-maturity securities portfolio, number of securities (security) 2  
Mortgage-backed securities | Debt securities    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 73  
Available for sale securities portfolio, number of securities (security) 101  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 3.30%  
Corporate bonds | Debt securities    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 4  
Available for sale securities portfolio, number of securities (security) 20  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 0.20%  
Other bonds and obligations | Debt securities    
Investment Holdings [Line Items]    
Available-for-sale, securities in unrealized loss positions (security) 6  
Available for sale securities portfolio, number of securities (security) 9  
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 1.50%  
Tax advantaged economic development bonds    
Investment Holdings [Line Items]    
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (as percent) 7.10%  
Held-to-maturity, securities in unrealized loss positions (security) 3  
Held-to-maturity securities portfolio, number of securities (security) 7