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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in each component of AOCI, net of tax        
Balance at beginning of period     $ 494,639 $ 568,041
Total other comprehensive income (loss), net of tax $ (1,793) $ 7,822 16,425 3,877
Balance at end of period 519,492 503,261 519,492 503,261
Investment Securities        
Changes in each component of AOCI, net of tax        
Balance at beginning of period 26,900 9,125 9,181 13,586
Other comprehensive income/loss before reclassifications (2,042) 7,563 15,677 1,979
Amounts reclassified from AOCI 0 0 0 1,123
Total other comprehensive income (loss), net of tax (2,042) 7,563 15,677 3,102
Balance at end of period 24,858 16,688 24,858 16,688
Defined Benefit Plans        
Changes in each component of AOCI, net of tax        
Balance at beginning of period (8,479) (9,911) (8,978) (10,427)
Other comprehensive income/loss before reclassifications 0 0 0 0
Amounts reclassified from AOCI 249 259 748 775
Total other comprehensive income (loss), net of tax 249 259 748 775
Balance at end of period (8,230) (9,652) (8,230) (9,652)
Accumulated Other Comprehensive Income        
Changes in each component of AOCI, net of tax        
Balance at beginning of period 18,421 (786) 203 3,159
Other comprehensive income/loss before reclassifications (2,042) 7,563 15,677 1,979
Amounts reclassified from AOCI 249 259 748 1,898
Total other comprehensive income (loss), net of tax (1,793) 7,822 16,425 3,877
Balance at end of period $ 16,628 $ 7,036 $ 16,628 $ 7,036