RETIREMENT PLANS (Details) (USD $) | 12 Months Ended |
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 |
Age |
RETIREMENT PLANS [Abstract] | | | |
Age of employees eligible to participate in retirement plan | 18 | | |
Percentage of gross compensation participates may elect to contribute (in hundredths) | 100.00% | | |
Vesting period under 401(k) plan | 5 years | | |
Percentage of vesting per year (in hundredths) | 20.00% | | |
Matching contributions | $357,000 | $350,000 | $332,000 |
Age of employees eligible to participate in the Pension Plan | 21 | | |
Minimum service period required to participate in pension plan | 12 months | | |
Percentage employee contribution to pension plan (in hundredths) | 2.00% | | |
Vesting period under pension plan | 4 years | | |
Increase in projected benefit obligation | 1,700,000 | | |
Weighted average assumptions used to determine the benefit obligation at year end [Abstract] | | | |
Discount rate (in hundredths) | 4.02% | 5.07% | 4.06% |
Rate of increase in compensation levels (in hundredths) | 3.50% | 3.50% | 3.00% |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Discount rate (in hundredths) | 5.07% | 4.06% | 5.23% |
Rate of increase in compensation levels (in hundredths) | 3.50% | 3.50% | 3.00% |
Expected long-term rate of return on plan assets (in hundredths) | 6.50% | 6.50% | 7.00% |
Components of net periodic pension cost [Abstract] | | | |
Service cost including expected expenses and net of expected plan participant contributions | 1,115,000 | 1,211,000 | 900,000 |
Interest cost | 1,407,000 | 1,216,000 | 1,367,000 |
Expected return on plan assets | -3,009,000 | -2,656,000 | -2,259,000 |
Amortization of prior service cost | 16,000 | 23,000 | 23,000 |
Amortization of net actuarial loss | 0 | 631,000 | 664,000 |
Net pension cost | -471,000 | 425,000 | 696,000 |
Change in projected benefit obligation [Abstract] | | | |
Projected benefit obligation at beginning of year | 28,650,000 | 30,698,000 | 26,891,000 |
Service cost excluding expected expenses and plan participant contributions | 1,051,000 | 1,211,000 | 889,000 |
Interest cost | 1,407,000 | 1,216,000 | 1,367,000 |
Benefits paid | -1,160,000 | -1,019,000 | -916,000 |
Assumption changes | 6,302,000 | -3,907,000 | 4,270,000 |
Experience loss (gain) and other | -463,000 | 451,000 | -1,803,000 |
Projected benefit obligation at end of year | 35,787,000 | 28,650,000 | 30,698,000 |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at beginning of year | 47,182,000 | 41,598,000 | 33,023,000 |
Actual return on plan assets | 6,009,000 | 6,660,000 | 3,459,000 |
Employer contributions | 0 | 0 | 6,024,000 |
Plan participant contributions | 251,000 | 245,000 | 243,000 |
Benefits paid | -1,160,000 | -1,019,000 | -916,000 |
Expenses | -74,000 | -302,000 | -235,000 |
Fair value of plan assets at end of year | 52,208,000 | 47,182,000 | 41,598,000 |
Funded status at end of year | 16,421,000 | 18,532,000 | 10,900,000 |
Accumulated Benefit Obligation | 33,403,000 | 26,261,000 | 27,783,000 |
Net actuarial loss and prior service cost included in accumulated other comprehensive income [Abstract] | | | |
Net actuarial loss | 4,442,000 | 1,844,000 | |
Prior service cost | 0 | 17,000 | |
Total | 4,442,000 | 1,861,000 | |
Plan Assets [Abstract] | | | |
Percentage of portfolio that may be invested in securities with ratings below investment grade (in hundredths) | 5.00% | | |
Percentage investment in single security, maximum (in hundredths) | 5.00% | | |
Maximum percentage of single investment pool or investment company of total plan assets (in hundredths) | 10.00% | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Percentage of plan assets (in hundredths) | 100.00% | 100.00% | |
Weighted average expected long-term rates of return (in hundredths) | 6.50% | 6.50% | 7.00% |
Total plan assets | 52,208,000 | 47,182,000 | 41,598,000 |
Estimated future benefit payments [Abstract] | | | |
2015 | 1,304,000 | | |
2016 | 1,470,000 | | |
2017 | 1,695,000 | | |
2018 | 1,799,000 | | |
2019 | 1,895,000 | | |
2020-2024 | 11,193,000 | | |
SERP expense | 133,000 | -19,000 | 45,000 |
Minimum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 4.70% | 4.75% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 4.70% | 4.75% | |
Weighted average expected long-term rates of return provided by Vanguard (in hundredths) | 25.00% | | |
Maximum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 7.10% | 8.50% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 7.10% | 8.50% | |
Weighted average expected long-term rates of return provided by Vanguard (in hundredths) | 75.00% | | |
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 52,116,000 | 46,878,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 52,116,000 | 46,878,000 | |
Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 92,000 | 304,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 92,000 | 304,000 | |
Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Short-term Investments Funds [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Percentage of plan assets (in hundredths) | 0.20% | 0.60% | |
Cash Equivalents [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at beginning of year | 304,000 | | |
Fair value of plan assets at end of year | 92,000 | 304,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Target allocation, minimum (in hundredths) | 0.00% | 0.00% | |
Target allocation, maximum (in hundredths) | 1.00% | 1.00% | |
Percentage of plan assets (in hundredths) | 0.20% | 0.60% | |
Total plan assets | 92,000 | 304,000 | |
Cash Equivalents [Member] | Maximum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 1.00% | 1.00% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 1.00% | 1.00% | |
Cash Equivalents [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 92,000 | 304,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 92,000 | 304,000 | |
Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Cash Equivalents [Member] | Vanguard Prime Money Market Mutual Fund [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 92,000 | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 92,000 | | |
Cash Equivalents [Member] | Vanguard Prime Money Market Mutual Fund [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | | |
Cash Equivalents [Member] | Vanguard Prime Money Market Mutual Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 92,000 | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 92,000 | | |
Cash Equivalents [Member] | Vanguard Prime Money Market Mutual Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | | |
Cash Equivalents [Member] | Short-term Investments Funds [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | | 304,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | | 304,000 | |
Cash Equivalents [Member] | Short-term Investments Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | | 0 | |
Cash Equivalents [Member] | Short-term Investments Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | | 304,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | | 304,000 | |
Cash Equivalents [Member] | Short-term Investments Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | | 0 | |
Equity Mutual Funds [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at beginning of year | 23,816,000 | | |
Fair value of plan assets at end of year | 15,490,000 | 23,816,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Target allocation, minimum (in hundredths) | 25.00% | 45.00% | |
Target allocation, maximum (in hundredths) | 35.00% | 55.00% | |
Percentage of plan assets (in hundredths) | 29.70% | 50.50% | |
Total plan assets | 15,490,000 | 23,816,000 | |
Equity Mutual Funds [Member] | Minimum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 6.60% | 6.25% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 6.60% | 6.25% | |
Equity Mutual Funds [Member] | Maximum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 12.00% | 11.50% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 12.00% | 11.50% | |
Equity Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 15,490,000 | 23,816,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 15,490,000 | 23,816,000 | |
Equity Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Equity Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Equity Mutual Funds [Member] | Vanguard Total Stock Market Index Fund (VITSX) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 8,226,000 | 12,383,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 8,226,000 | 12,383,000 | |
Equity Mutual Funds [Member] | Vanguard Total Stock Market Index Fund (VITSX) [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 8,226,000 | 12,383,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 8,226,000 | 12,383,000 | |
Equity Mutual Funds [Member] | Vanguard Total Stock Market Index Fund (VITSX) [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Equity Mutual Funds [Member] | Vanguard Total Stock Market Index Fund (VITSX) [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Equity Mutual Funds [Member] | Vanguard Total International Stock Index Fund (VTSNX) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 7,264,000 | 11,433,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 7,264,000 | 11,433,000 | |
Equity Mutual Funds [Member] | Vanguard Total International Stock Index Fund (VTSNX) [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 7,264,000 | 11,433,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 7,264,000 | 11,433,000 | |
Equity Mutual Funds [Member] | Vanguard Total International Stock Index Fund (VTSNX) [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Equity Mutual Funds [Member] | Vanguard Total International Stock Index Fund (VTSNX) [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Fixed Income Mutual Funds [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at beginning of year | 23,062,000 | | |
Fair value of plan assets at end of year | 36,626,000 | 23,062,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Target allocation, minimum (in hundredths) | 65.00% | 45.00% | |
Target allocation, maximum (in hundredths) | 75.00% | 55.00% | |
Percentage of plan assets (in hundredths) | 70.10% | 48.90% | |
Total plan assets | 36,626,000 | 23,062,000 | |
Fixed Income Mutual Funds [Member] | Minimum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 3.90% | 3.35% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 3.90% | 3.35% | |
Fixed Income Mutual Funds [Member] | Maximum [Member] | | | |
Weighted average assumptions used to determine net pension cost [Abstract] | | | |
Expected long-term rate of return on plan assets (in hundredths) | 5.00% | 5.40% | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Weighted average expected long-term rates of return (in hundredths) | 5.00% | 5.40% | |
Fixed Income Mutual Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 36,626,000 | 23,062,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 36,626,000 | 23,062,000 | |
Fixed Income Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Fixed Income Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Investment Grade Fund (VWETX) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 15,706,000 | 9,233,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 15,706,000 | 9,233,000 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Investment Grade Fund (VWETX) [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 15,706,000 | 9,233,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 15,706,000 | 9,233,000 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Investment Grade Fund (VWETX) [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Investment Grade Fund (VWETX) [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Bond Index Fund (VBLLX) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 20,920,000 | 13,829,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 20,920,000 | 13,829,000 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Bond Index Fund (VBLLX) [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 20,920,000 | 13,829,000 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 20,920,000 | 13,829,000 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Bond Index Fund (VBLLX) [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | 0 | 0 | |
Fixed Income Mutual Funds [Member] | Vanguard Long-Term Bond Index Fund (VBLLX) [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Change in fair value of plan assets [Abstract] | | | |
Fair value of plan assets at end of year | 0 | 0 | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Total plan assets | $0 | $0 | |