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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities losses $ 0 $ 0 $ 0 $ (1,866)
Tax benefit (6,392) (6,900) (18,790) (20,603)
Net income 11,466 12,206 34,784 34,936
Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net income (249) (259) (748) (1,898)
Investment Securities        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax 0 0 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)
Tax benefit     0 743
Net income     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 (374) (428) (1,125) (1,287)
Amortization of defined benefit plan items, tax 125 169 377 512
Reclassification from AOCI, net of tax (249) (259) (748) (775)
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 (374) (428) (1,125) (1,287)
Amortization of defined benefit plan items, tax 125 169 377 512
Reclassification from AOCI, net of tax     (748) (775)
Net actuarial loss        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (366) (419) (1,099) (1,260)
Amortization of defined benefit plan items, tax 123 165 371 499
Reclassification from AOCI, net of tax (243) (254) (728) (761)
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 (366) (419) (1,099) (1,260)
Net transition obligation        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (4) (12) (12)
Amortization of defined benefit plan items, tax 1 2 3 7
Reclassification from AOCI, net of tax (3) (2) (9) (5)
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) (12) (12)
Prior service cost        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (5) (14) (15)
Amortization of defined benefit plan items, tax 1 2 3 6
Reclassification from AOCI, net of tax (3) (3) (11) (9)
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) $ (14) $ (15)