COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Customer Loan Swaps
Financial Instruments [Line Items]
Notional amount of derivative	$ 592,090	$ 532,526
Forward-Starting Interest Rate Swap
Financial Instruments [Line Items]
Notional amount of derivative	50,000	50,000
Interest rate swaps
Financial Instruments [Line Items]
Notional amount of derivative	43,000	43,000
Interest rate lock commitments
Financial Instruments [Line Items]
Notional amount of derivative	26,182	15,249
Forward Contracts [Member]
Financial Instruments [Line Items]
Notional amount of derivative	13,023	15,125
Other Commitments
Financial Instruments [Line Items]
Notional amount of derivative	394	432
Letters of Credit
Financial Instruments [Line Items]
Notional amount of derivative	3,054	2,580
Home Equity
Financial Instruments [Line Items]
Notional amount of derivative	461,731	454,225
Commercial and commercial real estate
Financial Instruments [Line Items]
Notional amount of derivative	75,972	83,103
Residential
Financial Instruments [Line Items]
Notional amount of derivative	$ 39,128	$ 17,795