PLEDGED ASSETS - Assets Pledged By Counterparties (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Repurchase Agreement [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	$ 5,589,000	$ 67,000
Repurchase Agreement [Member] | Residential Mortgage Backed Securities [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	1,557,000	0
Repurchase Agreement [Member] | Residential Mortgage Backed Securities [Member] | Pass Through Certificate [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	1,557,000	0
Repurchase Agreement [Member] | USTreasurySecuritiesMember
Pledged Assets [Line Items]
Securities Pledged By Counterparties	180,000	0
Repurchase Agreement [Member] | Cash
Pledged Assets [Line Items]
Securities Pledged By Counterparties	3,852,000	67,000
Derivative [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	14,576,000	9,618,000
Derivative [Member] | Residential Mortgage Backed Securities [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	0	0
Derivative [Member] | Residential Mortgage Backed Securities [Member] | Pass Through Certificate [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	0	0
Derivative [Member] | USTreasurySecuritiesMember
Pledged Assets [Line Items]
Securities Pledged By Counterparties	0	0
Derivative [Member] | Cash
Pledged Assets [Line Items]
Securities Pledged By Counterparties	$ 14,576,000	$ 9,618,000