GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 31, 2021	Aug. 30, 2019	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 0	$ (800)	$ 0	$ (790)	$ 0	$ 63,000
Intangible assets amortization			2,915		$ 2,480	$ 5,829	$ 4,959
Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method						accelerated basis
Estimated weighted average life (in years)						5 years 8 months 12 days
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	$ 30,100		28,900			$ 28,900		30,100
Customer lists | Bannockburn [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 31,100		$ 29,300			$ 29,300		$ 31,100