SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Other Investments
Interest receivable	$ 10,200	$ 7,500
Other investments	66,298	71,794
Allowance for Credit Losses
Interest receivable	$ 10,200	7,500
Leases
Initial lease terms (in years)	13 years
Share-based Compensation
Company stock-based compensation cost	$ 13,400	$ 10,000	$ 6,700
Earnings Per Share
Anti-dilutive common shares excluded (in shares) | shares	4,170	0	0
Operating Segments
Number of reportable segments | segment	4
Minimum | Core deposit premiums
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	7 years
Minimum | US Premium Financing Holding Company | Referral relationships
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	8 years
Minimum | US Premium Financing Holding Company | Trade names
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	5 years
Minimum | US Premium Financing Holding Company | Non-compete agreements
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	3 years
Maximum | Core deposit premiums
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	10 years
Maximum | US Premium Financing Holding Company | Referral relationships
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	10 years
Maximum | US Premium Financing Holding Company | Trade names
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	7 years
Maximum | US Premium Financing Holding Company | Non-compete agreements
Goodwill and Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life (in years)	10 years
Buildings and leasehold improvements | Maximum
Premises and Equipment
Estimated useful lives, premises and equipment (in years)	40 years
Furniture and equipment | Minimum
Premises and Equipment
Estimated useful lives, premises and equipment (in years)	3 years
Furniture and equipment | Maximum
Premises and Equipment
Estimated useful lives, premises and equipment (in years)	20 years
Software And Computer Equipment | Minimum
Premises and Equipment
Estimated useful lives, premises and equipment (in years)	3 years
Software And Computer Equipment | Maximum
Premises and Equipment
Estimated useful lives, premises and equipment (in years)	5 years
Financing Receivable
Other Investments
Interest receivable	$ 77,300	$ 79,200
Allowance for Credit Losses
Interest receivable	$ 77,300	$ 79,200
Visa Class B-2 Shares
Other Investments
Shares held in other investment (in shares) | shares	28,805
Other investments	$ 121
Visa Class B Shares
Other Investments
Conversation ratio	1.5430