SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	1 Months Ended	12 Months Ended
	Jul. 20, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loans and Allowance for Loan Losses [Abstract]
Time period utilized in determining historical losses for impaired loan		24 months
Commercial loans and mortgage point rating system (in points)		10
Residential mortgage and home equity point rating system (in points)		3
Stockholders' Equity [Abstract]
Common stock sold in underwriting public offering (in shares)	1,437,500
Price per share of common stocks sold in underwriting public offerings (in dollars per share)	$ 24
Proceeds from public offering	$ 32,362,000
Shares Tendered Upon the Exercise of Stock Options and Withheld Upon the Vesting of RSUs [Abstract]
Share repurchased during period consists stock issued upon exercise of stock option (in shares)		8,450	1,897
Share repurchased during period consists stock issued upon exercise of stock option value		244,000	49,000
Share repurchased during period consists stock withheld upon conversion of restricted stock unit (in shares)		4,700	5,125	3,581
Share repurchased during period consists stock withheld upon conversion of restricted stock unit value		125,000	136,000	91,000
Unrealized holding gains (losses) on available-for-sale securities [Abstract]
Change arising during period		2,602,000	34,989,000	(6,049,000)
Reclassification adjustment for gains included in net income		(3,613,000)	(138,000)	(1,719,000)
Net unrealized gains (losses) on available-for-sale securities		(1,011,000)	34,851,000	(7,768,000)
Tax effect		(401,000)	13,834,000	(3,083,000)
Total unrealized holding gains (losses) on available-for-sale securities		(610,000)	21,017,000	(4,685,000)
Change in funded status of pension plan [Abstract]
Unrecognized net loss arising during period		(1,248,000)	(3,461,000)	(978,000)
Amortization of prior service cost included in pension expense		23,000	23,000	23,000
Amortization of net actuarial loss included in pension expense		664,000	266,000	322,000
Total amortization included in net periodic pension cost		(561,000)	(3,172,000)	(633,000)
Tax effect		(223,000)	(1,259,000)	(251,000)
Total amortization included in net periodic pension cost after taxes		(338,000)	(1,913,000)	(382,000)
Other comprehensive income (loss)		(948,000)	19,104,000	(5,067,000)
Accumulated Other Comprehensive Income, Net of Tax [Abstract]
Unrealized holding gains (loss) on available-for-sale securities		23,330,000
Current period change unrealized holding gains (loss) on available-for-sale securities		(610,000)	21,017,000	(4,685,000)
Unrealized holding gains on available-for-sale securities		22,720,000	23,330,000
Unrealized actuarial losses and prior service costs on pension plan		(5,642,000)
Current period change unrealized actuarial losses and prior service costs on pension plan		(338,000)	(1,913,000)	(382,000)
Unrealized actuarial loss and prior service cost on pension plan		(5,980,000)	(5,642,000)
Total accumulated other comprehensive income (loss)		17,688,000
Current period change in total accumulated other comprehensive income (loss)		(948,000)	19,104,000	(5,067,000)
Total accumulated other comprehensive income (loss)		$ 16,740,000	$ 17,688,000
Operating Segments [Abstract]
Number of reportable operating segments		1
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive share (in shares)		46,102	95,119	44,594
RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive share (in shares)		0	0	0
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		31 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		40 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		20 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives		10 years