GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Other Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 150,515	$ 146,064
Finite-Lived Intangible Assets, Accumulated Amortization	(64,912)	(62,115)
Servicing Asset	24,556	23,791
Core deposits
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	41,750	41,750
Finite-Lived Intangible Assets, Accumulated Amortization	(30,121)	(29,395)
Customer lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	72,278	69,563
Finite-Lived Intangible Assets, Accumulated Amortization	(22,094)	(20,553)
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,931	10,960
Finite-Lived Intangible Assets, Accumulated Amortization	(5,485)	(5,477)
Servicing Contracts
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (7,212)	$ (6,690)