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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities losses $ 0 $ 0 $ (1,640) $ 0
Tax benefit (6,367) (6,392) (20,598) (18,790)
Net income 11,812 11,466 36,916 34,784
Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net income (285) (249) (1,725) (748)
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 0 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
Tax benefit     653 0
Net income     (987) 0
Defined Benefit Plans        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax (285) (249) (738) (748)
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 (333) (374) (1,135) (1,125)
Amortization of defined benefit plan items, tax 48 125 397 377
Reclassification from AOCI, net of tax (285) (249) (738) (748)
Net actuarial loss        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (324) (366) (971) (1,099)
Amortization of defined benefit plan items, tax 44 123 331 371
Reclassification from AOCI, net of tax (280) (243) (640) (728)
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 (324) (366) (971) (1,099)
Net transition obligation        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (4) (13) (12)
Amortization of defined benefit plan items, tax 2 1 5 3
Reclassification from AOCI, net of tax (2) (3) (8) (9)
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) (13) (12)
Prior service cost        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (5) (4) (13) (14)
Amortization of defined benefit plan items, tax 2 1 5 3
Reclassification from AOCI, net of tax (3) (3) (8) (11)
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) $ (4) (13) (14)
Settlement        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax     (138)  
Amortization of defined benefit plan items, tax     56  
Reclassification from AOCI, net of tax     (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     $ 0 $ 0