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OTHER COMPREHENSIVE INCOME (LOSS): (Tables)
12 Months Ended
Dec. 31, 2012
Other Comprehensive Income Or Loss [Abstract]  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

Other comprehensive income (loss) components and related taxes were as follows:

 

  December 31, 
(Dollar amounts in thousands) 2012  2011  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 
Other comprehensive income (loss) $2,331  $(9,982) $(1,914)
Schedule of Accumulated Other Comprehensive Income (Loss)

The following is a summary of the accumulated other comprehensive income balances, net of tax:

 

  Balance  Current  Balance 
  at  Period  at 
(Dollar amounts in thousands) 12/31/2011  Change  12/31/2012 
Unrealized gains (losses) on securities available-for-sale $12,740  $691  $13,431 
Unrealized loss on retirement plans  (23,234)  2,331   (20,903)
TOTAL $(10,494) $3,022  $(7,472)