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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 15 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Before Tax              
Amortization         $ (3,644) $ (1,976)  
Other comprehensive income (loss), before tax $ (3,469)   $ (52,654)   11,841 (161,015)  
Tax Effect              
Other comprehensive income, tax (922)   (13,569)   3,132 (42,543)  
Net of Tax              
Other comprehensive income (2,547) $ 11,256 (39,085) $ (79,387) 8,709 (118,472)  
Net unrealized gains on investment securities              
Before Tax              
Other comprehensive income (loss) before reclassification, before tax (8,204)   (61,628)   7,054 (170,076)  
Amortization 1,976   1,976   3,644 1,976 $ 9,900
Other comprehensive income (loss), before tax (6,228)   (59,652)   10,698 (168,100)  
Tax Effect              
Other comprehensive income (loss) before reclassifications, tax (2,179)   (16,478)   1,873 (45,476)  
Less: Amortization of unrealized losses on investment securities transferred to HTM 525   528   968 528  
Other comprehensive income, tax (1,654)   (15,950)   2,841 (44,948)  
Net of Tax              
Other comprehensive income (loss), before reclassifications, net of tax (6,025)   (45,150)   5,181 (124,600)  
Amortization of unrealized losses on investment securities transferred to held-to-maturity 1,451   1,448   2,676 1,448  
Other comprehensive income (4,574)   (43,702)   7,857 (123,152)  
Net change in fair value of derivatives:              
Before Tax              
Other comprehensive income (loss) before reclassification, before tax 2,777   2,930   1,178 2,880  
Other comprehensive income (loss), before tax 2,777   2,930   1,178 2,880  
Tax Effect              
Other comprehensive income (loss) before reclassifications, tax 737   783   301 770  
Other comprehensive income, tax 737   783   301 770  
Net of Tax              
Other comprehensive income (loss), before reclassifications, net of tax 2,040   2,147   877 2,110  
Other comprehensive income 2,040   2,147   877 2,110  
Amortization of net actuarial loss              
Before Tax              
Reclassification from AOCI, before tax (20)   131   (39) 264  
Tax Effect              
Reclassification from AOCI, tax (5)   35   (10) 71  
Net of Tax              
Reclassification from AOCI, net of tax (15)   96   (29) 193  
Amortization of net transition obligation              
Before Tax              
Reclassification from AOCI, before tax 2   5   4 9  
Tax Effect              
Reclassification from AOCI, tax 0   1   0 2  
Net of Tax              
Reclassification from AOCI, net of tax 2   4   4 7  
SERPs              
Before Tax              
Other comprehensive income (loss), before tax 18   (4,068)   35 (4,205)  
Tax Effect              
Other comprehensive income, tax 5   (1,598)   10 (1,635)  
Net of Tax              
Other comprehensive income (loss), before reclassifications, net of tax 0   (697)   0 (697)  
Reclassification from AOCI, net of tax (13)   3,167   (25) 3,267  
Other comprehensive income $ (13)   $ 2,470   $ (25) $ 2,570