SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment $ / shares shares	Dec. 31, 2024 USD ($) purchaser branch	Dec. 31, 2022 USD ($) $ / shares shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments (segment) | segment	1
Treasury stock, value | $	$ 0.0		$ 0.0
Rocky Mountain Bank | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposal group, number of division branches sold | branch		9
Disposal group, number of purchasers | purchaser		2
Disposal group, deposits assets | $		$ 588.9
Disposal group, financing receivable | $		365.9
Disposal group, property, plant and equipment | $		$ 13.6
Series A Preferred Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares			$ 1
Preferred stock, shares authorized (in shares)			16,000
Preferred stock, shares issued (in shares)			0
Preferred stock, shares outstanding (in shares)			0
Series B Preferred Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares			$ 1
Preferred stock, shares authorized (in shares)			81,698
Preferred stock, shares issued (in shares)			0
Preferred stock, shares outstanding (in shares)			0
Series C Preferred Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares			$ 1
Preferred stock, shares authorized (in shares)			81,698
Preferred stock, shares issued (in shares)			0
Preferred stock, shares outstanding (in shares)			0
Series D Preferred Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares			$ 1
Preferred stock, shares authorized (in shares)			3,000
Preferred stock, shares issued (in shares)			0
Preferred stock, shares outstanding (in shares)			0
Preferred Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 1		$ 1
Preferred stock, shares authorized (in shares)	188,500		6,104
Preferred stock, shares issued (in shares)	0		0
Preferred stock, shares outstanding (in shares)	0		0