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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Changes in each component of AOCI, net of tax                
Balance at beginning of period     $ 452,871       $ 452,871  
Other comprehensive loss $ (14,272) $ (2,547) 11,256 $ (22,821) $ (39,085) $ (79,387) (5,563) $ (141,293)
Balance at end of period 468,598           468,598  
Investment Securities                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (141,252)   (149,109) (126,818)   (3,666) (149,109) (3,666)
Other comprehensive income (loss) before reclassifications (18,160)     (27,732)     (12,979) (152,332)
Reclassification adjustments from AOCI 1,587     1,699     4,263 3,147
Other comprehensive loss (16,573)     (26,033)     (8,716) (149,185)
Balance at end of period (157,825) (141,252)   (152,851) (126,818)   (157,825) (152,851)
Derivatives                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 5,522   4,645 2,110   0 4,645 0
Other comprehensive income (loss) before reclassifications 2,313     3,194     3,190 (5,304)
Reclassification adjustments from AOCI 0     0     0 0
Other comprehensive loss 2,313     3,194     3,190 5,304
Balance at end of period 7,835 5,522   5,304 2,110   7,835 5,304
SERPs                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 455   480 (1,724)   (4,294) 480 (4,294)
Other comprehensive income (loss) before reclassifications 0     0     0 (697)
Reclassification adjustments from AOCI (12)     18     (37) 3,285
Other comprehensive loss (12)     18     (37) 2,588
Balance at end of period 443 455   (1,706) (1,724)   443 (1,706)
Accum. Other Comp. Gain (Loss)                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (135,275)   (143,984) (126,432)   (7,960) (143,984) (7,960)
Other comprehensive income (loss) before reclassifications (15,847)     (24,538)     (9,789) (147,725)
Reclassification adjustments from AOCI 1,575     1,717     4,226 6,432
Other comprehensive loss (14,272) (2,547) $ 11,256 (22,821) (39,085) $ (79,387) (5,563) (141,293)
Balance at end of period $ (149,547) $ (135,275)   $ (149,253) $ (126,432)   $ (149,547) $ (149,253)