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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 7,170 $ 7,877 $ 10,002 $ 18,852        
Unrealized gain (loss) on derivatives 202 203 405 405        
Retirement obligation 0 0 0 0        
Total 7,372 8,080 10,407 19,257        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Unrealized gain (loss) on investment securities 838 (188) 1,354 (164)        
Unrealized gain (loss) on derivatives 0 0 0 0        
Retirement obligation (335) (317) (670) (634)        
Total 503 (505) 684 (798)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities 6,332 8,065 8,648 19,016        
Unrealized gain (loss) on derivatives 202 203 405 405        
Unfunded pension obligation 335 317 670 634        
Total 6,869 8,585 9,723 20,055        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities (2,256) (2,873) (3,085) (6,781)        
Unrealized gain (loss) on derivatives (74) (75) (149) (149)        
Retirement obligation (122) (116) (268) (233)        
Total (2,452) (3,064) (3,502) (7,163)        
Transactions Net of tax                
Unrealized gain (loss) on investment securities 4,076 5,192 5,563 12,235        
Unrealized gain (loss) on derivatives 128 128 256 256        
Retirement obligation 213 201 402 401        
Total 4,417 5,521 6,221 12,892        
Balances Net of tax                
Unrealized gain (loss) on investment securities 1,014 7,302 1,014 7,302 $ (3,062) $ (4,549) $ 2,110 $ (4,933)
Unrealized gain (loss) on cash flow hedges (835) (1,343) (835) (1,343) (963) (1,091) (1,471) (1,599)
Retirement obligation (22,401) (23,647) (22,401) (23,647) (22,614) (22,803) (23,848) (24,048)
Total $ (22,222) $ (17,688) $ (22,222) $ (17,688) $ (26,639) $ (28,443) $ (23,209) $ (30,580)