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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 12 Months Ended
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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 |  |

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