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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities losses $ 0 $ (1,866) $ 0 $ (1,866)
Tax benefit (6,331) (7,944) (12,398) (13,703)
Net income 12,137 12,335 23,318 22,730
Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net income (249) (1,379) (499) (1,639)
Investment Securities        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax 0 (1,123) 0 (1,123)
Investment Securities | Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities losses 0 (1,866) 0 (1,866)
Tax benefit 0 743 0 743
Net income 0 (1,123) 0 (1,123)
Defined Benefit Plans        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (375) (430) (751) (859)
Amortization of defined benefit plan items, tax 126 174 252 343
Reclassification from AOCI, net of tax (249) (256) (499) (516)
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 (375) (430) (751) (859)
Amortization of defined benefit plan items, tax 126 174 252 343
Reclassification from AOCI, net of tax (249) (256) (499) (516)
Net actuarial losses        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (366) (421) (733) (841)
Amortization of defined benefit plan items, tax 124 170 248 335
Reclassification from AOCI, net of tax (242) (251) (485) (506)
Net actuarial losses | Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (366) (421) (733) (841)
Net transition obligation        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (4) (8) (8)
Amortization of defined benefit plan items, tax 1 2 2 4
Reclassification from AOCI, net of tax (3) (2) (6) (4)
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) (8) (8)
Prior service cost        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (5) (5) (10) (10)
Amortization of defined benefit plan items, tax 1 2 2 4
Reclassification from AOCI, net of tax (4) (3) (8) (6)
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 $ (5) $ (5) $ (10) $ (10)