COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Schedule of Swapped Variable Cost for Fixed Cost and Terms of Interest Rate Swap Agreements) (Details) - USD ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, fair value		$ 123,000	$ 142,000
Loss on Cash Flow Hedge Ineffectiveness		0	0
Interest rate swaps
Derivative [Line Items]
Notional Amount		43,000,000	43,000,000
Derivative, fair value	[1]	5,877,000	7,571,000
Interest rate swaps | Contract, One
Derivative [Line Items]
Notional Amount		$ 10,000,000
Trade Date		Mar. 18, 2009
Maturity Date		Jun. 30, 2021
Variable Index Received		3 months
Fixed Rate Paid		5.09%
Derivative, fair value	[1]	$ 343,000	527,000
Interest rate swaps | Contract, Two
Derivative [Line Items]
Notional Amount		$ 10,000,000
Trade Date		Jul. 08, 2009
Maturity Date		Jun. 30, 2029
Variable Index Received		3 months
Fixed Rate Paid		5.84%
Derivative, fair value	[1]	$ 1,695,000	2,133,000
Interest rate swaps | Contract, Three
Derivative [Line Items]
Notional Amount		$ 10,000,000
Trade Date		May 06, 2010
Maturity Date		Jun. 30, 2030
Variable Index Received		3 months
Fixed Rate Paid		5.71%
Derivative, fair value	[1]	$ 1,671,000	2,129,000
Interest rate swaps | Contract, Four
Derivative [Line Items]
Notional Amount		$ 5,000,000
Trade Date		Mar. 14, 2011
Maturity Date		Mar. 30, 2031
Variable Index Received		3 months
Fixed Rate Paid		4.35%
Derivative, fair value	[1]	$ 899,000	1,137,000
Interest rate swaps | Contract, Five
Derivative [Line Items]
Notional Amount		$ 8,000,000
Trade Date		May 04, 2011
Maturity Date		Jul. 07, 2031
Variable Index Received		3 months
Fixed Rate Paid		4.14%
Derivative, fair value	[1]	$ 1,269,000	1,645,000
Forward-Starting Interest Rate Swap
Derivative [Line Items]
Notional Amount		25,000,000	50,000,000
Derivative, fair value	[2]	85,000	21,000
Forward-Starting Interest Rate Swap | Contract, One
Derivative [Line Items]
Notional Amount		$ 25,000,000
Trade Date		Feb. 25, 2015
Maturity Date		Feb. 25, 2018
Variable Index Received		1 month
Fixed Rate Paid		1.54%
Derivative, fair value	[2]	$ 0	20,000
Forward-Starting Interest Rate Swap | Contract, Two
Derivative [Line Items]
Notional Amount		$ 25,000,000
Trade Date		Feb. 25, 2015
Maturity Date		Feb. 25, 2019
Variable Index Received		1 month
Fixed Rate Paid		1.74%
Derivative, fair value	[2]	$ 85,000	$ 1,000

[1] Presented within accrued interest and other liabilities on the consolidated statements of condition.

[2] Presented within accrued interest and other liabilities on the consolidated statements of condition.