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OTHER COMPREHENSIVE INCOME (LOSS): (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Unrealized holding gains and (losses) on securities available-for-sale | $ (2,590) | $ 11,441 | $ (6,291)
Change in unrealized gains (losses) on securities available-for-sale for which a portion of OTTI has been recognized in earnings | 2,867 | 3,216 | 4,101
Reclassification adjustments for (gains) and losses later recognized in income | 875 | 104 | 2,939
Net unrealized gains and (losses) | 1,152 | 14,761 | 749
Tax effect | (461) | (5,904) | (300)
Other comprehensive income (loss) | 691 | 8,857 | 449
Unrecognized gains and (losses) on benefit plans | 1,309 | (17,885) | (4,376)
Amortization of prior service cost included in net periodic pension cost | 226 | 300 | 116
Amortization of unrecognized gains (losses) included in net periodic pension cost | 2,349 | 947 | 1,069
Benefit plans, net | 3,884 | (16,638) | (3,191)
Tax Effect | (1,553) | 6,656 | 1,277
Change in net unrealized gains/ (losses) on retirement plans & benefits | $ 2,331 | $ (9,982) | $ (1,914)

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