INVESTMENT SECURITIES - Narrative (Details) $ in Thousands	Dec. 31, 2016 USD ($) investment_security	Dec. 31, 2015 USD ($) investment_security
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position for more than 12 months \| investment_security	19
Gross unrealized losses on securities in loss position for more than 12 months	$ 2,258	$ 3,583
Investment securities, as a percentage of total stockholders' equity	10.00%
Carrying amount of investment securities pledged as collateral	$ 389,075	$ 279,953
Mortgage-backed securities issued by GSE
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security	133	83
Gross unrealized losses on securities in loss position for more than 12 months	$ 1,187	$ 3,463
SBA-guaranteed securities
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security	6	1
Gross unrealized losses on securities in loss position for more than 12 months	$ 0	$ 0
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security	19	15
Gross unrealized losses on securities in loss position for more than 12 months	$ 1,021	$ 111
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security	5	3
Gross unrealized losses on securities in loss position for more than 12 months	$ 0	$ 0
GSE Securities
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security	4	1
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security	117	9
Gross unrealized losses on securities in loss position for more than 12 months	$ 50	$ 0
Non-agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position \| investment_security		1
Gross unrealized losses on securities in loss position for more than 12 months	$ 0	$ 9
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on securities in loss position for more than 12 months		$ 0

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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