GOODWILL AND INTANGIBLE ASSETS - Schedule of Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Carrying amount of goodwill at beginning of year	$ 1,015,646	$ 1,012,620
Fair value adjustments related to acquisitions in prior year	0	3,026
Carrying amount of goodwill at end of year	1,015,646	1,015,646
Banking Division
Goodwill [Roll Forward]
Carrying amount of goodwill at beginning of year	951,148	948,122
Fair value adjustments related to acquisitions in prior year	0	3,026
Carrying amount of goodwill at end of year	951,148	951,148
Premium Finance Division
Goodwill [Roll Forward]
Carrying amount of goodwill at beginning of year	64,498	64,498
Carrying amount of goodwill at end of year	$ 64,498	$ 64,498