INVESTMENT SECURITIES - Portfolio of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale:
Amortized Cost	$ 344,416	$ 317,375
Gross Unrealized Gains	2,479	3,389
Gross Unrealized Losses	5,022	2,605
Securities available-for-sale	341,873	318,159
Obligations of state and political subdivisions
Available-for-sale:
Amortized Cost	29,935	30,750
Gross Unrealized Gains	226	770
Gross Unrealized Losses	1,020	27
Securities available-for-sale	29,141	31,493
GSE mortgage-backed securities
Available-for-sale:
Amortized Cost	72,144	84,946
Gross Unrealized Gains	1,736	2,321
Gross Unrealized Losses	302	229
Securities available-for-sale	73,578	87,038
Collateralized mortgage obligations: residential
Available-for-sale:
Amortized Cost	223,602	194,067
Gross Unrealized Gains	206	297
Gross Unrealized Losses	3,606	2,276
Securities available-for-sale	220,202	192,088
Collateralized mortgage obligations: commercial
Available-for-sale:
Amortized Cost	3,135	5,512
Gross Unrealized Gains	0	1
Gross Unrealized Losses	53	65
Securities available-for-sale	3,082	5,448
Mutual funds
Available-for-sale:
Amortized Cost	2,100	2,100
Gross Unrealized Gains	0	0
Gross Unrealized Losses	41	8
Securities available-for-sale	2,059	$ 2,092
Corporate debt securities
Available-for-sale:
Amortized Cost	13,500
Gross Unrealized Gains	311
Gross Unrealized Losses	0
Securities available-for-sale	$ 13,811

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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