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SECURITIES - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Investment Holdings [Line Items]      
Purchases of securities available for sale | $ $ 119,671 $ 257,547 $ 471,211
Proceeds from sales of securities available for sale | $ $ 136,229 499 $ 137,539
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 0.60%    
Number of HTM investment securities in unrealized loss positions (security) 1    
Number of securities in the portfolio of HTM (security) 210    
Collateralized mortgage obligations      
Investment Holdings [Line Items]      
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 0.50%    
Number of HTM investment securities in unrealized loss positions (security) 1    
Number of securities in the portfolio of HTM (security) 9    
Debt securities | Collateralized mortgage obligations      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 28    
Available for sale securities portfolio, number of securities (security) 245    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 0.30%    
Debt securities | Mortgage-backed Securities      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 39    
Available for sale securities portfolio, number of securities (security) 107    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 0.90%    
Debt securities | Corporate bonds      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 6    
Available for sale securities portfolio, number of securities (security) 23    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 1.40%    
Debt securities | Other bonds and obligations      
Investment Holdings [Line Items]      
Available-for-sale securities in an unrealized loss position (security) 3    
Available for sale securities portfolio, number of securities (security) 8    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 0.40%    
Debt securities | Tax advantaged economic development bonds      
Investment Holdings [Line Items]      
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 11.60%    
Number of HTM investment securities in unrealized loss positions (security) 1    
Number of securities in the portfolio of HTM (security) 5    
Net unrealized holding gain/(loss) on AFS securities      
Investment Holdings [Line Items]      
Income tax benefit/(liability) related to items of accumulated other comprehensive income/(loss) | $ $ (5,100) 3,800  
Net unrealized holding gain/(loss) on AFS securities | Securities Available for Sale      
Investment Holdings [Line Items]      
Other accumulated comprehensive income/(loss), before tax | $ 14,200 (21,600)  
Net unrealized holding gain/(loss) on AFS securities | Held-to-maturity Securities      
Investment Holdings [Line Items]      
Other accumulated comprehensive income/(loss), before tax | $ $ 5,000 $ 6,400