ACCUMULATED 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
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 99 $ 5,213 $ 18,951 $ 8,219        
Unrealized gain (loss) on derivatives 202 203 607 (1,222)        
Retirement obligation 0 0 0 0        
Foreign Currency Translation 0 91   50        
Total 301 5,507 19,558 7,047        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Unrealized gain (loss) on investment securities 398 409 234 1,503        
Unrealized gain (loss) on derivatives 0 0 0 0        
Retirement obligation (317) (350) (951) (1,050)        
Foreign Currency Translation 0 0   0        
Total 81 59 (717) 453        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities (299) 4,804 18,717 6,716        
Unrealized gain (loss) on derivatives 202 203 607 (1,222)        
Unfunded pension obligation 317 350 951 1,050        
Foreign currency translation 0 91   50        
Total 220 5,448 20,275 6,594        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities 137 (1,747) (6,644) (2,429)        
Unrealized gain (loss) on derivatives (74) (75) (223) 451        
Retirement obligation (117) (130) (350) (426)        
Foreign currency translation 0 0   0        
Total (54) (1,952) (7,217) (2,404)        
Transactions Net of tax                
Unrealized gain (loss) on investment securities (162) 3,057 12,073 4,287        
Unrealized gain (loss) on derivatives 128 128 384 (771)        
Retirement obligation 200 220 601 624        
Foreign currency translation 0 91 0 50        
Total 166 3,496 13,058 4,190        
Balances Net of tax                
Unrealized gain (loss) on investment securities 7,140 1,781 7,140 1,781 $ 7,302 $ (4,933) $ (1,276) $ (2,506)
Unrealized gain (loss) on cash flow hedges (1,215) (1,720) (1,215) (1,720) (1,343) (1,599) (1,848) (949)
Retirement obligation (23,447) (17,280) (23,447) (17,280) (23,647) (24,048) (17,500) (17,904)
Foreign currency translation 0 0 0 0 0   (91) (50)
Total $ (17,522) $ (17,219) $ (17,522) $ (17,219) $ (17,688) $ (30,580) $ (20,715) $ (21,409)