GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Feb. 29, 2024	Dec. 31, 2023	Dec. 31, 2021	Aug. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,788		$ 4,231
Other Depreciation and Amortization	3,100		3,300
Amortization of Mortgage Servicing Rights (MSRs)	$ 800		$ 700
Brady Ware Corporate Finance
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 100
Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method	accelerated basis
Estimated weighted average life (in years)	4 years
Customer lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method	straight-line basis
Estimated weighted average life (in years)				13 years		12 years	11 years
Customer lists | Summit Funding Group
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 24,500				$ 25,100
Customer lists | Bannockburn [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	23,000				$ 23,900
Customer lists | Agile Premium Finance
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 2,700