COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount of commitments and contingencies		$ 830,495	$ 757,743
Unused lines of credit		25,000
Federal Home Loan Bank unused borrowing capacity		1,000,000
Federal Reserve Bank unused borrowing capacity		10,500
Federal Reserve required average total reserve		63,200
Federal Reserve Bank of New York reserve requirement represented by cash on hand		62,600
Required deposit with Federal Reserve Bank of New York		600
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, lower range		0
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, upper range		1,000
Litigation settlement charge	$ 2,800
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount of commitments and contingencies		811,442	733,827
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount of commitments and contingencies		$ 19,053	$ 23,916