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LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Activity in Allowance for Credit Losses on Loans by Portfolio Segment) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 02, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | $ 53,022 | $ 35,412 | $ 35,728 | $ 36,935 | $ 36,935
Charge-offs |  | (11,170) | (422) | (12,715) | (1,240) | (1,883)
Recoveries |  | 109 | 141 | 408 | 412 | 623
Acquired PCD loans (Note 3) |  |  |  | 3,071 |  |
Provision for acquired non-PCD loans (Note 3) | $ 6,300 |  |  | 6,293 |  |
General provision for loan losses |  |  |  | 12,716 |  |
(Credit) provision for loan losses |  | 3,540 | 283 | 19,009 | (693) | 53
Ending balance |  | 45,501 | 35,414 | 45,501 | 35,414 | 35,728
Commercial real estate - non-owner-occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | 19,398 | 15,268 | 14,897 | 16,581 | 16,581
Charge-offs |  | (27) | 0 | (27) | 0 | 0
Recoveries |  | 0 | 1 | 2 | 9 | 10
Acquired PCD loans (Note 3) |  |  |  | 1,659 |  |
Provision for acquired non-PCD loans (Note 3) |  |  |  | 2,335 |  |
General provision for loan losses |  |  |  | (138) |  |
(Credit) provision for loan losses |  | (643) | 552 | 2,197 | (769) | (1,694)
Ending balance |  | 18,728 | 15,821 | 18,728 | 15,821 | 14,897
Commercial real estate - owner-occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | 4,314 | 2,166 | 2,481 | 2,290 | 2,290
Charge-offs |  | 0 | 0 | (191) | 0 | 0
Recoveries |  | 8 | 0 | 59 | 0 | 0
Acquired PCD loans (Note 3) |  |  |  | 340 |  |
Provision for acquired non-PCD loans (Note 3) |  |  |  | 840 |  |
General provision for loan losses |  |  |  | 717 |  |
(Credit) provision for loan losses |  | (76) | 161 | 1,557 | 37 | 191
Ending balance |  | 4,246 | 2,327 | 4,246 | 2,327 | 2,481
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | 12,075 | 5,407 | 5,856 | 4,869 | 4,869
Charge-offs |  | (11,075) | (394) | (12,320) | (1,157) | (1,784)
Recoveries |  | 87 | 108 | 317 | 270 | 455
Acquired PCD loans (Note 3) |  |  |  | 575 |  |
Provision for acquired non-PCD loans (Note 3) |  |  |  | 816 |  |
General provision for loan losses |  |  |  | 10,528 |  |
(Credit) provision for loan losses |  | 4,685 | (320) | 11,344 | 819 | 2,316
Ending balance |  | 5,772 | 4,801 | 5,772 | 4,801 | 5,856
Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | 13,509 | 9,571 | 9,979 | 10,254 | 10,254
Charge-offs |  | 0 | 0 | (4) | 0 | 0
Recoveries |  | 8 | 6 | 19 | 19 | 26
Acquired PCD loans (Note 3) |  |  |  | 305 |  |
Provision for acquired non-PCD loans (Note 3) |  |  |  | 1,979 |  |
General provision for loan losses |  |  |  | 566 |  |
(Credit) provision for loan losses |  | (673) | (136) | 2,545 | (832) | (301)
Ending balance |  | 12,844 | 9,441 | 12,844 | 9,441 | 9,979
Home equity |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | 3,565 | 2,311 | 2,397 | 2,217 | 2,217
Charge-offs |  | (18) | (1) | (22) | (1) | (1)
Recoveries |  | 1 | 5 | 1 | 86 | 98
Acquired PCD loans (Note 3) |  |  |  | 165 |  |
Provision for acquired non-PCD loans (Note 3) |  |  |  | 268 |  |
General provision for loan losses |  |  |  | 953 |  |
(Credit) provision for loan losses |  | 214 | (27) | 1,221 | (14) | 83
Ending balance |  | 3,762 | 2,288 | 3,762 | 2,288 | 2,397
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Beginning balance |  | 161 | 689 | 118 | 724 | 724
Charge-offs |  | (50) | (27) | (151) | (82) | (98)
Recoveries |  | 5 | 21 | 10 | 28 | 34
Acquired PCD loans (Note 3) |  |  |  | 27 |  |
Provision for acquired non-PCD loans (Note 3) |  |  |  | 55 |  |
General provision for loan losses |  |  |  | 90 |  |
(Credit) provision for loan losses |  | 33 | 53 | 145 | 66 | (542)
Ending balance |  | $ 149 | $ 736 | $ 149 | $ 736 | $ 118

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