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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Before Tax        
Other comprehensive income (loss), before tax $ (3,016) $ 12,989 $ 27,155 $ 6,438
Tax Effect        
Other comprehensive income, tax (1,223) 5,167 10,730 2,561
Net of Tax        
Total other comprehensive income (loss), net of tax (1,793) 7,822 16,425 3,877
Net unrealized gains on investment securities        
Before Tax        
Other comprehensive income (loss) before reclassification, before tax (3,390) 12,561 26,030 3,285
Reclassification from AOCI, before tax 0 0 0 1,866
Other comprehensive income (loss), before tax (3,390) 12,561 26,030 5,151
Tax Effect        
Other comprehensive income (loss) before reclassifications, tax (1,348) 4,998 10,353 1,306
Reclassification from AOCI, tax 0 0 0 743
Other comprehensive income, tax (1,348) 4,998 10,353 2,049
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax (2,042) 7,563 15,677 1,979
Reclassification from AOCI, net of tax 0 0 0 1,123
Total other comprehensive income (loss), net of tax (2,042) 7,563 15,677 3,102
Net actuarial loss        
Before Tax        
Reclassification from AOCI, before tax 366 419 1,099 1,260
Tax Effect        
Reclassification from AOCI, tax 123 165 371 499
Net of Tax        
Reclassification from AOCI, net of tax 243 254 728 761
Amortization of net transition obligation        
Before Tax        
Reclassification from AOCI, before tax 4 4 12 12
Tax Effect        
Reclassification from AOCI, tax 1 2 3 7
Net of Tax        
Reclassification from AOCI, net of tax 3 2 9 5
Amortization of prior service cost        
Before Tax        
Reclassification from AOCI, before tax 4 5 14 15
Tax Effect        
Reclassification from AOCI, tax 1 2 3 6
Net of Tax        
Reclassification from AOCI, net of tax 3 3 11 9
Defined benefit plans, net        
Before Tax        
Reclassification from AOCI, before tax 374 428 1,125 1,287
Tax Effect        
Reclassification from AOCI, tax 125 169 377 512
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax 0 0 0 0
Reclassification from AOCI, net of tax 249 259 748 775
Total other comprehensive income (loss), net of tax $ 249 $ 259 $ 748 $ 775