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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]        
Unrealized gain (loss) on investment securities $ 39,617 $ (182,479)    
Retirement obligation 0 0    
Foreign currency translation 4 11    
Total 39,621 (182,468)    
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]        
Realized gain (loss) on securities available-for-sale 519 (3)    
Retirement obligation (150) (325)    
Foreign currency translation 0 0    
Total 369 (328)    
Transactions Pre-tax        
Unrealized gain (loss) on investment securities 39,098 (182,476)    
Unfunded pension obligation 150 325    
Foreign currency translation 4 11    
Total 39,252 (182,140)    
Transactions Tax-effect        
Unrealized gain (loss) on investment securities (8,613) 40,075    
Retirement obligation (35) 21    
Foreign currency translation 0 0    
Total (8,648) 40,096    
Transactions Net of tax        
Unrealized gain (loss) on investment securities 30,485 (142,401)    
Retirement obligation 115 346    
Foreign currency translation 4 11    
Total 30,604 (142,044)    
Balances Net of tax        
Unrealized gain (loss) on investment securities (295,440) (121,363) $ (325,925) $ 21,038
Retirement obligation (31,908) (20,500) (32,023) (20,846)
Foreign currency translation (711) (614) (715) (625)
Total (328,059) (142,477) $ (358,663) $ (433)
Accumulated other comprehensive income (loss)        
Transactions Net of tax        
Total $ 30,604 $ (142,044)