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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance $ 2,247,713 $ 2,034,770 $ 1,912,571
Other comprehensive income (loss) before reclassifications (29,113) 57,629  
Amounts reclassified from accumulated other comprehensive income (loss) 16,398 5,552  
Period change (12,715) 63,181 (294,264)
Ending balance 2,304,983 2,247,713 2,034,770
Total      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (175,970) (239,151) 55,113
Period change (12,715) 63,181 (294,264)
Ending balance (188,685) (175,970) (239,151)
Unrealized Gains (Losses) on Securities Available for Sale      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (173,654) (234,495)  
Other comprehensive income (loss) before reclassifications (31,156) 55,366  
Amounts reclassified from accumulated other comprehensive income (loss) 16,398 5,475  
Period change (14,758) 60,841  
Ending balance (188,412) (173,654) (234,495)
Unrealized Gains (Losses) on Cash Flow Hedges      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance 0 130  
Other comprehensive income (loss) before reclassifications 0 (142)  
Amounts reclassified from accumulated other comprehensive income (loss) 0 12  
Period change 0 (130)  
Ending balance 0 0 130
Unrealized Gains (Losses) on Defined Benefit Plans      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (2,316) (4,786)  
Other comprehensive income (loss) before reclassifications 2,043 2,405  
Amounts reclassified from accumulated other comprehensive income (loss) 0 65  
Period change 2,043 2,470  
Ending balance $ (273) $ (2,316) $ (4,786)