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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 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 1,760 12,103
Balance at end of period 511,561 509,377
Investment Securities    
Changes in each component of AOCI, net of tax    
Balance at beginning of period 4,729 9,181
Other comprehensive income/loss before reclassifications 2,124 11,853
Amounts reclassified from AOCI 0 0
Total other comprehensive income, net of tax 2,124 11,853
Balance at end of period 6,853 21,034
Defined Benefit Plans    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (6,250) (8,978)
Other comprehensive income/loss before reclassifications (627) 0
Amounts reclassified from AOCI 263 250
Total other comprehensive income, net of tax (364) 250
Balance at end of period (6,614) (8,728)
Accumulated Other Comprehensive Income    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (1,521) 203
Other comprehensive income/loss before reclassifications 1,497 11,853
Amounts reclassified from AOCI 263 250
Total other comprehensive income, net of tax 1,760 12,103
Balance at end of period $ 239 $ 12,306