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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Changes in each component of AOCI, net of tax    
Balance at beginning of period $ 452,871  
Other comprehensive income 11,256 $ (79,387)
Balance at end of period 470,926  
Investment Securities    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (149,109) (3,666)
Other comprehensive (loss) income before reclassifications 11,206 (79,450)
Reclassification adjustments from AOCI 1,225 0
Other comprehensive income 12,431 (79,450)
Balance at end of period (136,678) (83,116)
Derivatives    
Changes in each component of AOCI, net of tax    
Balance at beginning of period 4,645 0
Other comprehensive (loss) income before reclassifications (1,163) (37)
Reclassification adjustments from AOCI 0 0
Other comprehensive income (1,163) (37)
Balance at end of period 3,482 (37)
SERPs    
Changes in each component of AOCI, net of tax    
Balance at beginning of period 480 (4,294)
Other comprehensive (loss) income before reclassifications 0 0
Reclassification adjustments from AOCI (12) 100
Other comprehensive income (12) 100
Balance at end of period 468 (4,194)
Accum. Other Comp. Loss    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (143,984) (7,960)
Other comprehensive (loss) income before reclassifications 10,043 (79,487)
Reclassification adjustments from AOCI 1,213 100
Other comprehensive income 11,256 (79,387)
Balance at end of period $ (132,728) $ (87,347)