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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Tax benefit | $ (6,810) | $ (6,067)
Net income | 13,079 | 11,181
Amount Reclassified from AOCI |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Net income | (263) | (250)
Investment Securities |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Reclassification from AOCI, net of tax | 0 | 0
Defined Benefit Plans |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | 613 | (376)
Amortization of defined benefit plan items, tax | (249) | 126
Reclassification from AOCI, net of tax | (263) | (250)
Defined Benefit Plans | Amount Reclassified from AOCI |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | (429) | (376)
Amortization of defined benefit plan items, tax | 166 | 126
Net actuarial loss |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | (421) | (367)
Amortization of defined benefit plan items, tax | 164 | 124
Reclassification from AOCI, net of tax | (257) | (243)
Net actuarial loss | Amount Reclassified from AOCI |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | (421) | (367)
Net transition obligation |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | (4) | (4)
Amortization of defined benefit plan items, tax | 1 | 1
Reclassification from AOCI, net of tax | (3) | (3)
Net transition obligation | Amount Reclassified from AOCI |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | (4) | (4)
Prior service cost |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | (4) | (5)
Amortization of defined benefit plan items, tax | 1 | 1
Reclassification from AOCI, net of tax | (3) | (4)
Prior service cost | Amount Reclassified from AOCI |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |
Amortization of defined benefit plan items, before tax | $ (4) | $ (5)

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