SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total shareholders’ equity	$ 1,012,221	$ 954,062	$ 1,182,435	$ 1,187,773
Accumulated other comprehensive (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total shareholders’ equity	(143,016)	(181,052)	(3,243)	30,871
Net unrealized holding (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive (loss), before tax:	(188,927)	(236,887)
Income taxes related to items of accumulated other comprehensive (loss):	49,401	61,329
Total shareholders’ equity	(139,525)	(175,557)	(1,398)	33,459
Net (loss) on effective cash flow hedging derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive (loss), before tax:	(4,265)	(6,667)
Income taxes related to items of accumulated other comprehensive (loss):	1,159	1,789
Total shareholders’ equity	(3,106)	(4,878)	0	0
Net unrealized holding (loss) on pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other accumulated comprehensive (loss), before tax:	(528)	(844)
Income taxes related to items of accumulated other comprehensive (loss):	144	228
Total shareholders’ equity	$ (385)	$ (617)	$ (1,845)	$ (2,588)