INCOME TAXES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of the statutory federal income tax rate to the effective tax rate [Abstract]
Statutory federal income tax rate (in hundredths)	34.00%	34.00%	34.00%
State and local income taxes, net of federal income tax benefit (in hundredths)	3.10%	3.10%	2.90%
Tax-exempt income, net of disallowed cost of funding (in hundredths)	(17.50%)	(16.90%)	(14.60%)
Other (in hundredths)	0.10%	0.10%	0.30%
Effective income tax rate, continuing operations (in hundredths)	19.70%	20.30%	22.60%
Current [Abstract]
Federal	$ 1,575,000	$ 3,168,000	$ 4,772,000
State and local	607,000	1,033,000	1,211,000
Current income tax expense (benefit)	2,182,000	4,201,000	5,983,000
Deferred [Abstract]
Federal	2,262,000	636,000	(459,000)
State and local	573,000	107,000	(153,000)
Deferred income tax expense (benefit)	2,835,000	743,000	(612,000)
Provision for income taxes	5,017,000	4,944,000	5,371,000
Deferred tax assets [Abstract]
Allowance for loan losses	7,312,000	6,335,000
Stock-based compensation	907,000	922,000
Supplemental executive retirement expense	19,000	18,000
Directors' retirement expense	71,000	75,000
Accrued rent expense	130,000	117,000
Other	51,000	30,000
Deferred tax assets, gross	8,490,000	7,497,000
Valuation allowance	0	0
Deferred tax assets net	8,490,000	7,497,000
Deferred tax liabilities [Abstract]
Prepaid pension	4,210,000	2,318,000
Unrealized gains on available-for-sale securities	14,956,000	15,358,000
Deferred loan costs	1,558,000	0
Prepaid expenses	184,000	0
Depreciation	912,000	939,000
Deferred tax liabilities, gross	21,820,000	18,615,000
Net deferred tax liability	(13,330,000)	(11,118,000)
Unrecognized tax benefits	$ 0	$ 0	$ 0