GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Aug. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 40	$ 4,200	$ (1,537)	$ 4,361	$ (2,327)
Other Depreciation and Amortization	3,400		3,500	10,100	11,000
Amortization of Mortgage Servicing Rights (MSRs)	$ 800		$ 700	2,300	$ 2,400
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 6 months			4 years 6 months
Customer lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method				straight-line basis
Estimated weighted average life (in years)							12 years	11 years
Customer lists | Summit Funding Group
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 25,700			$ 25,700		$ 27,600
Customer lists | Bannockburn [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 24,800			$ 24,800		$ 27,500