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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Net change in fair value of investment securities:                
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value             $ (5,425) $ (3,644)
Other comprehensive income (loss) $ 24,693     $ (19,434)     24,564 (7,593)
Net change in fair value of investment securities:                
Other comprehensive income (loss) 6,516     (5,162)     6,482 (2,030)
Net change in fair value of investment securities:                
Net change in fair value of investment securities 19,942     (18,061)     15,036 (12,880)
Total other comprehensive income (loss), net of tax 18,177 $ 1,632 $ (1,727) (14,272) $ (2,547) $ 11,256 18,082 (5,563)
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 27,092     (24,729)        
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value 1,920     2,026     5,425 5,670
Net change in fair value of investment securities 29,012     (22,568)        
Net unrealized gains arising during the period             20,427 (17,675)
Other comprehensive income (loss)             25,852 (11,870)
Defined benefit plans, Before Tax                
Amortization       (135)       (135)
Net change in fair value of investment securities:                
Net unrealized gains (losses) on AFS investment securities arising during the period 7,150     (6,569)        
Amortization of unrealized losses on investment securities transferred to HTM 507     538     1,432 1,506
Net change in fair value of investment securities 7,657     (5,995)        
Net unrealized gains (losses) arising during the period             5,391 (4,696)
Other comprehensive income (loss)             6,823 (3,154)
Defined benefit plans, Tax Effect                
Amortization       (36)       (36)
Net change in fair value of investment securities:                
Net unrealized gains (losses) on investment securities arising during the period 19,942     (18,160)        
Amortization of unrealized losses on investment securities transferred to held-to-maturity (1,413)     (1,488)     (3,993) (4,164)
Net change in fair value of investment securities 21,355     (16,573)        
Other comprehensive income (loss) before reclassifications             15,036 (12,979)
Total other comprehensive income (loss), net of tax             19,029 (8,716)
Defined benefit plans, Net of Tax                
Amortization       (99)       (99)
Gain (Loss) On Unrealized Losses On Derivative Instruments                
Net change in fair value of investment securities:                
Net unrealized gains arising during the period (4,317)     3,151     (1,286) 4,329
Other comprehensive income (loss) (4,317)     3,151     (1,286) 4,329
Net change in fair value of investment securities:                
Net unrealized gains (losses) arising during the period (1,140)     838     (340) 1,139
Other comprehensive income (loss) (1,140)     838     (340) 1,139
Net change in fair value of investment securities:                
Other comprehensive income (loss) before reclassifications (3,177)     2,313     (946) 3,190
Total other comprehensive income (loss), net of tax (3,177)     2,313     (946) 3,190
Amortization of net actuarial gain                
Defined benefit plans, Before Tax                
Amortization 2     19     2 58
Defined benefit plans, Tax Effect                
Amortization 1     7     1 17
Defined benefit plans, Net of Tax                
Amortization 1     12     1 41
Amortization of net transition obligation                
Defined benefit plans, Before Tax                
Amortization       (2)       (6)
Defined benefit plans, Tax Effect                
Amortization       (2)       (2)
Defined benefit plans, Net of Tax                
Amortization       0       (4)
SERP                
Net change in fair value of investment securities:                
Other comprehensive income (loss) 2     17     2 52
Net change in fair value of investment securities:                
Other comprehensive income (loss) 1     5     1 15
Net change in fair value of investment securities:                
Other comprehensive income (loss) before reclassifications 0     0     0 0
Total other comprehensive income (loss), net of tax (1)     (12)     (1) (37)
Defined benefit plans, Net of Tax                
Amortization $ 1     $ 12     $ 1 $ 37