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OTHER COMPREHENSIVE INCOME (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amounts Reclassified from AOCI        
Realized gains on sale of available for sale securities $ 260   $ 260 $ 449
Total reclassifications, before income tax 14,146 $ 13,514 40,979 40,302
Income tax benefit (4,703) (4,663) (13,524) (13,971)
Net income 9,443 8,851 27,455 26,331
Amount Reclassified from Accumulated Other Comprehensive Income        
Amounts Reclassified from AOCI        
Total reclassifications, before income tax (221) (331) (1,182) (564)
Income tax benefit 91 134 484 229
Net income (130) (197) (698) (335)
Amount Reclassified from Accumulated Other Comprehensive Income | Net securities gains        
Amounts Reclassified from AOCI        
Realized gains on sale of available for sale securities 260   260 449
Amount Reclassified from Accumulated Other Comprehensive Income | Amortization of defined benefit pension plan and the defined benefit plan component of the SERP        
Amounts Reclassified from AOCI        
Prior service credit 20 20 58 58
Transition obligation (7) (7) (21) (21)
Actuarial losses (125) (108) (376) (325)
Amount Reclassified from Accumulated Other Comprehensive Income | Realized losses on cash flow hedges        
Amounts Reclassified from AOCI        
Gain (loss) on interest rate contracts reclassified to interest expense $ (369) $ (236) $ (1,103) $ (725)