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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities losses $ (1,640) $ 0 $ (1,640) $ 0
Tax benefit (7,421) (6,331) (14,231) (12,398)
Net income 12,025 12,137 25,104 23,318
Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net income (1,177) (249) (1,440) (499)
Amortization of defined benefit plan items, before tax     (138) 0
Investment Securities        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax (987) 0 (987) 0
Investment Securities | Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities losses (1,640) 0 (1,640) 0
Tax benefit 653 0 653 0
Net income (987) 0 (987) 0
Defined Benefit Plans        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (472) (375) 240 (751)
Amortization of defined benefit plan items, tax 282 126 (66) 252
Reclassification from AOCI, net of tax (190) (249) (453) (499)
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 (472) (375) (802) (751)
Amortization of defined benefit plan items, tax 282 126 349 252
Reclassification from AOCI, net of tax (190) (249) (453) (499)
Net actuarial loss        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (325) (366) (647) (733)
Amortization of defined benefit plan items, tax 222 124 287 248
Reclassification from AOCI, net of tax (103) (242) (360) (485)
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 (325) (366) (647) (733)
Net transition obligation        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (5) (4) (9) (8)
Amortization of defined benefit plan items, tax 2 1 3 2
Reclassification from AOCI, net of tax (3) (3) (6) (6)
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 (5) (4) (9) (8)
Prior service cost        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (5) (8) (10)
Amortization of defined benefit plan items, tax 2 1 3 2
Reclassification from AOCI, net of tax (2) (4) (5) (8)
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) (8) (10)
Settlement        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (138)   (138)  
Amortization of defined benefit plan items, tax 56   56  
Reclassification from AOCI, net of tax $ (82)   (82)  
Settlement | Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax     $ (138) $ 0