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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Changes in each component of AOCI, net of tax            
Balance at beginning of period   $ 452,871     $ 452,871  
Other comprehensive income $ (2,547) 11,256 $ (39,085) $ (79,387) 8,709 $ (118,472)
Balance at end of period 476,279       476,279  
Investment Securities            
Changes in each component of AOCI, net of tax            
Balance at beginning of period (136,678) (149,109) (83,116) (3,666) (149,109) (3,666)
Other comprehensive income before reclassifications (6,025)   (45,150)   5,181 (124,600)
Reclassification adjustments from AOCI 1,451   1,448   2,676 1,448
Other comprehensive income (4,574)   (43,702)   7,857 (123,152)
Balance at end of period (141,252) (136,678) (126,818) (83,116) (141,252) (126,818)
Derivatives            
Changes in each component of AOCI, net of tax            
Balance at beginning of period 3,482 4,645 (37) 0 4,645 0
Other comprehensive income before reclassifications 2,040   2,147   877 (2,110)
Reclassification adjustments from AOCI 0   0   0 0
Other comprehensive income 2,040   2,147   877 2,110
Balance at end of period 5,522 3,482 2,110 (37) 5,522 2,110
SERPs            
Changes in each component of AOCI, net of tax            
Balance at beginning of period 468 480 (4,194) (4,294) 480 (4,294)
Other comprehensive income before reclassifications 0   (697)   0 (697)
Reclassification adjustments from AOCI (13)   3,167   (25) 3,267
Other comprehensive income (13)   2,470   (25) 2,570
Balance at end of period 455 468 (1,724) (4,194) 455 (1,724)
Accum. Other Comp. Loss            
Changes in each component of AOCI, net of tax            
Balance at beginning of period (132,728) (143,984) (87,347) (7,960) (143,984) (7,960)
Other comprehensive income before reclassifications (3,985)   (43,700)   6,058 (123,187)
Reclassification adjustments from AOCI 1,438   4,615   2,651 4,715
Other comprehensive income (2,547) 11,256 (39,085) (79,387) 8,709 (118,472)
Balance at end of period $ (135,275) $ (132,728) $ (126,432) $ (87,347) $ (135,275) $ (126,432)