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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount $ 122,855   $ 122,855    
Estimated Fair Value Asset (Liability) 716   716    
Designated as Hedging Instrument | Cash flow hedges:          
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount 90,000   $ 90,000    
Weighted Average Maturity (in years)     5 years 7 months 6 days    
Estimated Fair Value Asset (Liability) 950   $ 950    
Designated as Hedging Instrument | Cash flow hedges: | Interest rate caps agreements          
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount 90,000   $ 90,000   $ 90,000
Weighted Average Maturity (in years)     5 years 7 months 6 days   6 years 1 month 6 days
Estimated Fair Value Asset (Liability) 950   $ 950   $ 1,748
Realized gain (loss) 55 $ 8 94 $ 0  
Designated as Hedging Instrument | Economic hedges:          
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount 18,219   $ 18,219    
Weighted Average Maturity (in years)     2 months 12 days    
Estimated Fair Value Asset (Liability) (231)   $ (231)    
Designated as Hedging Instrument | Economic hedges: | Forward sale commitments          
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount 18,219   $ 18,219    
Weighted Average Maturity (in years)     2 months 12 days    
Estimated Fair Value Asset (Liability) (231)   $ (231)    
Realized gain (loss) (9) 0 (87) 0  
Not Designated as Hedging Instrument          
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount 14,636   $ 14,636    
Weighted Average Maturity (in years)     2 months 12 days    
Estimated Fair Value Asset (Liability) (3)   $ (3)    
Not Designated as Hedging Instrument | Interest rate lock commitments          
Interest rate swap agreements and non-hedging derivative assets and liabilities          
Notional Amount 14,636   $ 14,636    
Weighted Average Maturity (in years)     2 months 12 days    
Estimated Fair Value Asset (Liability) (3)   $ (3)    
Realized gain (loss) $ (26) $ 0 $ (24) $ 0