GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Feb. 29, 2024	Dec. 31, 2023	Dec. 31, 2021	Aug. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 0	$ 1,800		$ 90	$ 4,200	$ 1,788	$ 4,321
Other Depreciation and Amortization	3,300			3,400		6,400	6,700
Amortization of Mortgage Servicing Rights (MSRs)	$ 900			$ 800		$ 1,700	$ 1,500
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)	3 years 9 months 18 days					3 years 9 months 18 days
Customer lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method						straight-line basis
Finite-Lived Intangible Assets, Remaining Amortization Period								12 years 8 months 12 days		9 years 6 months	6 years 2 months 12 days
Customer lists | Summit Funding Group
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 23,900					$ 23,900			$ 25,100
Customer lists | Bannockburn [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	22,100					22,100			$ 23,900
Customer lists | Agile Premium Finance
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 2,600					$ 2,600