GOODWILL AND INTANGIBLE ASSETS - Changes in carrying values of goodwill and intangible assets (Details) (Changes in carrying values of goodwill and intangible assets, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in carrying values of goodwill and intangible assets
Goodwill (1)
Balance, beginning of period	$ 9,829	$ 9,829	$ 9,829
Additions	2,723
Impairment
Balance, end of period	12,552	9,829	9,829
Core Deposit Intangibles
Cost, beginning of period	2,543	2,543	2,543
Union Savings branch purchase	490
Riverside Bank merger	2,215
Impairment
Cost, end of period	5,248	2,543	2,543
Amortization, beginning of period	(1,967)	(1,745)	(1,523)
Amortization	(291)	(222)	(222)
Amortization, end of period	(2,258)	(1,967)	(1,745)
Core deposit intangibles, net	$ 2,990	$ 576	$ 798

GOODWILL AND INTANGIBLE ASSETS - Changes in carrying values of goodwill and intangible assets (Details) (Changes in carrying values of goodwill and intangible assets, USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Changes in carrying values of goodwill and intangible assets

Goodwill (1)

Balance, beginning of period

$ 9,829us-gaap_GoodwillGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Additions

2,723us-gaap_AdditionsToOtherAssetsAmount
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Impairment

Balance, end of period

12,552us-gaap_GoodwillGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

9,829us-gaap_GoodwillGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Core Deposit Intangibles

Cost, beginning of period

2,543us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Union Savings branch purchase

490us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAdditions
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Riverside Bank merger

2,215us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationIncreases
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Impairment

Cost, end of period

5,248us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

2,543us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Amortization, beginning of period

(1,967)us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

(1,745)us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

(1,523)us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Amortization

(291)us-gaap_AmortizationOfAcquisitionCosts
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

(222)us-gaap_AmortizationOfAcquisitionCosts
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Amortization, end of period

(2,258)us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

(1,967)us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

(1,745)us-gaap_OtherIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

Core deposit intangibles, net

$ 2,990us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

$ 576us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

$ 798us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember

- Definition

Amount of significant additions in the period in other assets (current, noncurrent, or unclassified).

+ 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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

Name:	us-gaap_GoodwillImpairedAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Additions in intangible assets arising from insurance contracts acquired in a business combination during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section S99

-Paragraph 2

-Subparagraph (2)

-URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Gross increase during the period in intangible assets arising from insurance contracts acquired in a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationIncreases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Details

Name:	us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract
Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date of rights not otherwise specified in the taxonomy having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The net carrying amount as of the balance sheet date of other indefinite-lived and finite-lived intangible assets that are not separately presented on the statement of financial position.

+ References

No definition available.

+ Details

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Balance Type:	debit
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