GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Other Intangibles (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 145,340	$ 146,739
Finite-Lived Intangible Assets, Accumulated Amortization	(58,962)	(52,820)
Servicing Asset	23,067	21,347
Core deposits
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	41,750	41,750
Finite-Lived Intangible Assets, Accumulated Amortization	(28,668)	(26,488)
Customer lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	69,563	69,563
Finite-Lived Intangible Assets, Accumulated Amortization	(19,029)	(14,457)
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	10,960	14,079
Finite-Lived Intangible Assets, Accumulated Amortization	(5,073)	(7,064)
Servicing Contracts
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (6,192)	$ (4,811)