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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Changes in each component of AOCI, net of tax    
Balance at beginning of period $ 546,685  
Total other comprehensive (loss) income, net of tax (17,117) $ 10,663
Balance at end of period 542,865  
Investment Securities    
Changes in each component of AOCI, net of tax    
Balance at beginning of period 26,651 14,825
Other comprehensive income before reclassifications (17,301) 10,147
Reclassification adjustments from AOCI 0 0
Total other comprehensive (loss) income, net of tax (17,301) 10,147
Balance at end of period 9,350 24,972
Defined Benefit Plans    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (6,523) (6,416)
Other comprehensive income before reclassifications 0 313
Reclassification adjustments from AOCI 184 203
Total other comprehensive (loss) income, net of tax 184 516
Balance at end of period (6,339) (5,900)
Accum. Other Comp. Income (Loss)    
Changes in each component of AOCI, net of tax    
Balance at beginning of period 20,128 8,409
Other comprehensive income before reclassifications (17,301) 10,460
Reclassification adjustments from AOCI 184 203
Total other comprehensive (loss) income, net of tax (17,117) 10,663
Balance at end of period $ 3,011 $ 19,072