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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ (71,051) $ (142,733) $ (64,285) $ (454,844)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (2,014)   (2,445)          
Retirement obligation 0 0 0 0        
Foreign currency translation (269) (70) (121) (86)        
Total (73,334) (142,803) (66,851) (454,930)        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Realized gain (loss) on securities available-for-sale (4) 179 (407) 176        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (71) 0 (72) 0        
Retirement obligation (213) (340) (534) (995)        
Foreign currency translation 0 0 0 0        
Total (288) (161) (1,013) (819)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities (71,047) (142,912) (63,878) (455,020)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax (1,943)   (2,373)          
Unfunded pension obligation 213 340 534 995        
Foreign currency translation (269) (70) (121) (86)        
Total (73,046) (142,642) (65,838) (454,111)        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities 15,650 31,479 14,070 100,108        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax (450)   (549)          
Retirement obligation (49) (79) (123) (134)        
Foreign currency translation 0 0 0 0        
Total 16,051 31,400 14,496 99,974        
Transactions Net of tax                
Unrealized gain (loss) on investment securities (55,397) (111,433) (49,808) (354,912)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax (1,493) 0 (1,824) 0        
Retirement obligation 164 261 411 861        
Foreign currency translation (269) (70) (121) (86)        
Total (56,995) (111,242) (51,342) (354,137)        
Balances Net of tax                
Unrealized gain (loss) on investment securities (375,733) (333,874) (375,733) (333,874) $ (320,336) $ (325,925) $ (222,441) $ 21,038
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax (1,824)   (1,824)   (331) 0    
Retirement obligation (31,612) (19,985) (31,612) (19,985) (31,776) (32,023) (20,246) (20,846)
Foreign currency translation (836) (711) (836) (711) (567) (715) (641) (625)
Accumulated other comprehensive loss (410,005) (354,570) (410,005) (354,570) $ (353,010) $ (358,663) $ (243,328) $ (433)
Accumulated other comprehensive income (loss)                
Transactions Net of tax                
Total $ (56,995) $ (111,242) $ (51,342) $ (354,137)