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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets      
Lease liability $ 9,598 $ 10,891  
Allowance for credit losses 13,534 14,382  
Accrued expenses 3,737 3,616  
Employee retirement benefits 1,941 2,547  
Federal net operating loss carryforwards 16,363 0  
State net operating loss carryforwards 7,583 3,091  
Restricted stock and non-qualified stock options 388 611  
Premises and equipment 4,717 4,678  
Other 9,504 6,333  
Total deferred tax assets 67,365 46,149  
Deferred tax liabilities      
Right-of-use lease asset 9,356 10,546  
Intangible assets 2,427 2,604  
Other 3,647 3,808  
Total deferred tax liabilities 15,430 16,958  
Less: Deferred tax valuation allowance 3,398 3,359  
Net deferred tax assets 48,537 25,832  
Net gains (losses) on sales of investment securities 8,506 150 $ (201)
Income tax (expenses) benefit (24,841) (25,758) (11,760)
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value 4,295 0 0
Total reclassification adjustments from AOCI for the period, net of tax 73,928 79,894 37,273
Investment Securities      
Deferred tax liabilities      
Amortization (4,698) 110 (147)
Amortization of net actuarial losses      
Deferred tax liabilities      
Amortization 304 1,036 (1,160)
Tax effect (81) (291) 310
Amortization 223 745 (850)
Amortization of net transition obligation      
Deferred tax liabilities      
Amortization 18 18 (18)
Tax effect (4) (4) 5
Amortization 14 14 (13)
Amortization of prior service cost      
Deferred tax liabilities      
Amortization     (14)
Tax effect     4
Amortization     (10)
Defined Benefit Plans      
Deferred tax liabilities      
Amortization (3,304) (759) (873)
Amount Reclassified from AOCI      
Deferred tax liabilities      
Total reclassification adjustments from AOCI for the period, net of tax (8,002) (649) (1,020)
Amount Reclassified from AOCI | Investment Securities      
Deferred tax liabilities      
Net gains (losses) on sales of investment securities 0 150 (201)
Income tax (expenses) benefit 0 (40) 54
Net change in fair value of investment securities 0 110 (147)
Amount Reclassified from AOCI | Accumulated Net Unrealized Loss on Held To Maturity Securities      
Deferred tax liabilities      
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value (6,218) 0 0
Less: Amortization of unrealized losses on investment securities transferred to HTM 1,520 0 0
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax (4,698) 0 0
Amount Reclassified from AOCI | Amortization of net actuarial losses      
Deferred tax liabilities      
Amortization (304) (1,036) (1,160)
Amount Reclassified from AOCI | Amortization of net transition obligation      
Deferred tax liabilities      
Amortization (18) (18) (18)
Amount Reclassified from AOCI | Amortization of prior service cost      
Deferred tax liabilities      
Amortization 0 0 (14)
Amount Reclassified from AOCI | Settlement      
Deferred tax liabilities      
Amortization (4,884) 0 0
Amount Reclassified from AOCI | Defined Benefit Plans      
Deferred tax liabilities      
Amortization (5,206) (1,054) (1,192)
Tax effect 1,902 295 319
Amortization $ (3,304) $ (759) $ (873)