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EMPLOYEE SAVINGS AND STOCK OWNERSHIP PLAN (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Employee savings and stock ownership plan | |||
| ESOP related expenses | $ 1,881,000 | $ 1,891,000 | $ 2,599,000 |
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ESOP | Full-time employees employed at date of IPO
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| Employee savings and stock ownership plan | |||
| Eligibility age required to receive retirement benefits | 21 years | ||
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ESOP | Other salaried employees
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| Employee savings and stock ownership plan | |||
| Eligibility age required to receive retirement benefits | 21 years | ||
| Eligibility service period required to receive retirement benefits | 1 year | ||
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KSOP
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| Employee savings and stock ownership plan | |||
| Loan receivable from ESOP | 20,200,000 | 21,700,000 | |
| Allocated shares | 1,614,572 | 1,434,964 | |
| Number of suspense shares | 1,610,200 | 1,789,808 | |
| Market value of the unearned shares | 17,600,000 | 17,000,000 | |
| ESOP related expenses | $ 2,400,000 | $ 2,200,000 | $ 2,500,000 |