INTEREST RATE SWAPS - NON-HEDGE (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Information about derivatives and swaps    
Fair value of investment securities pledged as collateral $ 231,891,000 $ 490,074,000
Counterparty    
Information about derivatives and swaps    
Fair value of investment securities pledged as collateral 1,800,000 1,500,000
Counterparty | Minimum    
Information about derivatives and swaps    
Net loss position in which pledged securities as collateral are required 250,000  
Interest rate swap    
Information about derivatives and swaps    
Notional amount 63,106,000 51,854,000
Fair Value 101,000  
Interest rate swap | Bank Clients    
Information about derivatives and swaps    
Notional amount 31,553,000 25,927,000
Fair Value 156,000 400,000
Interest rate swap | Counterparty    
Information about derivatives and swaps    
Notional amount 31,553,000 25,927,000
Fair Value $ (55,000) $ (400,000)