INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($) Security
Pooled Bank Trust Preferred Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Number of TRUP securities not deemed having OTTI | Security		1
Number of TRUP securities deemed have OTTI | Security		1
Held-to-Maturity Securities, Fair Value [Abstract]
Less than 12 Consecutive Months		$ 0
12 Consecutive Months or Longer		2,439
Total		2,439
Held-to-Maturity Securities, Unrealized Losses [Abstract]
Less than 12 Consecutive Months		0
12 Consecutive Months or Longer		303
Total		303
Registered Mutual Funds [Member]
Available-for-Sale Securities, Fair Value [Abstract]
Less than 12 Consecutive Months	$ 1,074	1,308
12 Consecutive Months or Longer	1,574	1,747
Total	2,648	3,055
Available-for-Sale Securities, Unrealized Losses [Abstract]
Less than 12 Consecutive Months	21	47
12 Consecutive Months or Longer	31	131
Total	52	178
Pass-through MBS Issued by Government Sponsored Entities ("GSEs") [Member]
Available-for-Sale Securities, Fair Value [Abstract]
Less than 12 Consecutive Months	16,349
12 Consecutive Months or Longer	0
Total	16,349
Available-for-Sale Securities, Unrealized Losses [Abstract]
Less than 12 Consecutive Months	67
12 Consecutive Months or Longer	0
Total	67
Agency Collateralized Mortgage Obligation ("CMO") [Member]
Available-for-Sale Securities, Fair Value [Abstract]
Less than 12 Consecutive Months	5,064	3,186
12 Consecutive Months or Longer	3,133	0
Total	8,197	3,186
Available-for-Sale Securities, Unrealized Losses [Abstract]
Less than 12 Consecutive Months	15	61
12 Consecutive Months or Longer	55	0
Total	$ 70	$ 61