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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Changes in each component of AOCI, net of tax        
Balance at beginning of period     $ 504,675 $ 494,639
Total other comprehensive income, net of tax $ 2,985 $ 6,115 4,745 18,218
Balance at end of period 512,955 517,616 512,955 517,616
Investment Securities        
Changes in each component of AOCI, net of tax        
Balance at beginning of period 6,853 21,034 4,729 9,181
Other comprehensive income/loss before reclassifications 1,808 5,866 3,932 17,719
Amounts reclassified from AOCI 987 0 987 0
Total other comprehensive income, net of tax 2,795 5,866 4,919 17,719
Balance at end of period 9,648 26,900 9,648 26,900
Defined Benefit Plans        
Changes in each component of AOCI, net of tax        
Balance at beginning of period (6,614) (8,728) (6,250) (8,978)
Other comprehensive income/loss before reclassifications 0 0 (627) 0
Amounts reclassified from AOCI 190 249 453 499
Total other comprehensive income, net of tax 190 249 (174) 499
Balance at end of period (6,424) (8,479) (6,424) (8,479)
Accumulated Other Comprehensive Income        
Changes in each component of AOCI, net of tax        
Balance at beginning of period 239 12,306 (1,521) 203
Other comprehensive income/loss before reclassifications 1,808 5,866 3,305 17,719
Amounts reclassified from AOCI 1,177 249 1,440 499
Total other comprehensive income, net of tax 2,985 6,115 4,745 18,218
Balance at end of period $ 3,224 $ 18,421 $ 3,224 $ 18,421