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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net change in fair value of investment securities:    
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value $ (1,638) $ (1,668)
Other comprehensive income (loss) (2,344) 15,310
Net change in fair value of investment securities:    
Other comprehensive income (loss) (617) 4,054
Net change in fair value of investment securities:    
Net change in fair value of investment securities (5,180) 11,206
Total other comprehensive income (loss), net of tax (1,727) 11,256
Net unrealized gains on investment securities    
Net change in fair value of investment securities:    
Net unrealized gains (losses) on AFS investment securities arising during the period (7,035) 15,258
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value 1,638 1,668
Net change in fair value of investment securities (5,397) 16,926
Net change in fair value of investment securities:    
Net unrealized gains (losses) on AFS investment securities arising during the period (1,855) 4,052
Less: Amortization of unrealized losses on investment securities transferred to HTM 432 443
Net change in fair value of investment securities (1,423) 4,495
Net change in fair value of investment securities:    
Net unrealized gains (losses) on investment securities arising during the period (5,180) 11,206
Amortization of unrealized losses on investment securities transferred to held-to-maturity (1,206) (1,225)
Net change in fair value of investment securities (3,974) 12,431
Gain (Loss) On Unrealized Losses On Derivative Instruments    
Net change in fair value of investment securities:    
Net unrealized losses arising during the period 3,053 (1,599)
Other comprehensive income (loss) 3,053 (1,599)
Net change in fair value of investment securities:    
Net unrealized gains (losses) arising during the period 806 (436)
Other comprehensive income (loss) 806 (436)
Net change in fair value of investment securities:    
Other comprehensive income (loss) before reclassifications 2,247 (1,163)
Total other comprehensive income (loss), net of tax 2,247 (1,163)
Amortization of net actuarial gain    
Defined benefit plans, Before Tax    
Amortization   19
Defined benefit plans, Tax Effect    
Amortization   5
Defined benefit plans, Net of Tax    
Amortization   14
Amortization of net transition obligation    
Defined benefit plans, Before Tax    
Amortization   (2)
Defined benefit plans, Tax Effect    
Amortization   0
Defined benefit plans, Net of Tax    
Amortization   (2)
SERP    
Net change in fair value of investment securities:    
Other comprehensive income (loss)   17
Net change in fair value of investment securities:    
Other comprehensive income (loss)   5
Net change in fair value of investment securities:    
Other comprehensive income (loss) before reclassifications 0 0
Total other comprehensive income (loss), net of tax 0 (12)
Defined benefit plans, Net of Tax    
Amortization $ 0 $ 12