BORROWINGS (Additional Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Residential real estate loans and securities pledged as collateral for FHLB advances, carrying value	$ 337,600	$ 299,400
FHLB Stock owned	8,100
FHLB borrowing capacity, authorized	800,000
Line of Credit Facility, Current Borrowing Capacity	45,200
Commercial loans pledged as collateral for Federal Reserve Discount Window, carrying value	402,400
Federal Reserve borrowing capacity	305,600
Secured Debt	180,000
Federal Home Loan Bank, Advances, Premium	180,000
Securities Sold under Agreements to Repurchase	50,045	69,622	$ 54,907
Collateralized Mortgage Backed Securities [Member]
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase	$ 98,000	$ 117,500