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LOANS AND CREDIT QUALITY - Activity in Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 68,334 | $ 108,021 | $ 88,558 | $ 133,778 | $ 133,778
Initial allowance on acquired loans | 63,494 |  | 63,494 |  |
Provision for credit losses | 46,058 | 6,730 | 42,663 | 2,684 |
Loans charged off | (12,803) | (14,572) | (34,969) | (46,034) |
Recoveries | 3,876 | 3,302 | 9,213 | 13,053 |
Ending balance | 168,959 | 103,481 | 168,959 | 103,481 | 88,558
Commercial and Industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 3,456 | 5,409 | 4,869 | 5,805 | 5,805
Initial allowance on acquired loans | 15,923 |  | 15,923 |  |
Provision for credit losses | 4,311 | (103) | 2,864 | (1,219) |
Loans charged off | (484) | (313) | (705) | (525) | (1,221)
Recoveries | 38 | 12 | 293 | 944 |
Ending balance | 23,244 | 5,005 | 23,244 | 5,005 | 4,869
Commercial Real Estate |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 33,599 | 34,092 | 35,097 | 31,486 | 31,486
Initial allowance on acquired loans | 42,934 |  | 42,934 |  |
Provision for credit losses | 24,780 | 590 | 23,282 | 3,196 |
Loans charged off | (250) | 0 | (250) | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Ending balance | 101,063 | 34,682 | 101,063 | 34,682 | 35,097
Residential Real Estate |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 4,977 | 6,741 | 4,656 | 6,745 | 6,745
Initial allowance on acquired loans | 4,612 |  | 4,612 |  |
Provision for credit losses | 12,613 | 58 | 12,934 | 64 |
Loans charged off | (9) | 0 | (9) | (10) | (10)
Recoveries | 0 | 0 | 0 | 0 |
Ending balance | 22,193 | 6,799 | 22,193 | 6,799 | 4,656
Auto |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 23,867 | 58,698 | 41,282 | 87,053 | 87,053
Initial allowance on acquired loans | 1 |  | 1 |  |
Provision for credit losses | 3,553 | 5,730 | 2,144 | (1,567) |
Loans charged off | (11,365) | (13,318) | (32,125) | (42,850) | (55,097)
Recoveries | 3,677 | 3,025 | 8,431 | 11,499 |
Ending balance | 19,733 | 54,135 | 19,733 | 54,135 | 41,282
Other Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 2,435 | 3,081 | 2,654 | 2,689 | 2,689
Initial allowance on acquired loans | 24 |  | 24 |  |
Provision for credit losses | 801 | 455 | 1,439 | 2,210 |
Loans charged off | (695) | (941) | (1,880) | (2,649) | (3,218)
Recoveries | 161 | 265 | 489 | 610 |
Ending balance | $ 2,726 | $ 2,860 | $ 2,726 | $ 2,860 | $ 2,654

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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