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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Changes in each component of AOCI, net of tax                
Balance at beginning of period     $ 558,219       $ 558,219  
Other comprehensive loss $ (22,821) $ (39,085) (79,387) $ (6,659) $ 1,915 $ (17,117) (141,293) $ (21,861)
Balance at end of period 438,468           438,468  
Investment Securities                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (126,818)   (3,666) 11,077   26,651 (3,666) 26,651
Other comprehensive (loss) income before reclassifications (27,732)     (6,779)     (152,332) (22,316)
Reclassification adjustments from AOCI 1,699     (73)     3,147 (110)
Other comprehensive loss (26,033)     (6,852)     (149,185) (22,426)
Balance at end of period (152,851) (126,818)   4,225 11,077   (152,851) 4,225
Derivatives                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 2,110   0     0 0 0
Other comprehensive (loss) income before reclassifications 3,194     0     5,304
Reclassification adjustments from AOCI 0     0     0
Other comprehensive loss 3,194     0     5,304 0
Balance at end of period 5,304 2,110   0     5,304 0
SERPs                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (1,724)   (4,294) (6,151)   (6,523) (4,294) (6,523)
Other comprehensive (loss) income before reclassifications 0     0     (697) 0
Reclassification adjustments from AOCI 18     193     3,285 565
Other comprehensive loss 18     193     2,588 565
Balance at end of period (1,706) (1,724)   (5,958) (6,151)   (1,706) (5,958)
Accum. Other Comp. Loss                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (126,432)   (7,960) 4,926   20,128 (7,960) 20,128
Other comprehensive (loss) income before reclassifications (24,538)     (6,779)     (147,725) (22,316)
Reclassification adjustments from AOCI 1,717     120     6,432 455
Other comprehensive loss (22,821) (39,085) $ (79,387) (6,659) 1,915 $ (17,117) (141,293) (21,861)
Balance at end of period $ (149,253) $ (126,432)   $ (1,733) $ 4,926   $ (149,253) $ (1,733)