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ACCUMULATED OTHER COMPREHENSIVE INCOME AMOUNT RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Gains on sales of investment securities $ 1,505 $ 70 $ 1,724
Amortization of prior service cost 413 413 423
Recognized net actuarial loss (1,888) (1,824) (2,709)
Pension settlement charges 0 0 (6,174)
Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax (1,475) (1,411) (8,460)
Total reclassifications for the period, before tax 30 (1,773) (7,148)
Deposits [Member] | Cash Flow Hedging [Member] | Interest Expense | Interest Rate Contracts      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 0 $ (432) $ (412)