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LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Proceeds from the sale of mortgage loans |  |  |  | $ 158,867 | $ 138,429 |  |  |
Gain on sale of mortgage loans |  |  |  | (1,535) | (1,191) |  |  |
Loans held for sale, at fair value (book value of $11,607 and $10,152, respectively) | $ 11,706 |  |  | 11,706 |  | $ 10,320 |  |
Allowance for credit losses | 35,414 | $ 36,407 | $ 35,412 | 35,414 | 36,407 | 36,935 | $ 36,983 | $ 36,922
Provision (credit) for loan losses | 283 | (456) |  | $ (693) | 288 | 1,174 |  |
Other industry exposures |  |  |  | 0 |  |  |  |
Non-Accrual Loans | 5,350 |  |  | $ 5,350 |  | 5,448 |  |
Loans outstanding | 4,116,729 |  |  | 4,116,729 |  | 4,098,094 |  |
Interest lost on nonaccrual loans | 44 | 34 |  | 148 | 84 |  |  |
Loans and Leases Receivable, Excluded Accrued Interest from Amortized Cost | 12,700 |  |  | 12,700 |  | 12,700 |  |
FHLB advances, general debt obligations, pledged collateral | 1,900,000 |  |  | 1,900,000 |  | 1,900,000 |  |
Residential real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 1,762,395 |  |  | 1,762,395 |  | 1,763,378 |  |
Proceeds from the sale of mortgage loans | 62,400 | 66,200 |  | 157,300 |  |  |  |
Gain on sale of mortgage loans | (687) | (429) |  | (1,500) |  |  |  |
Loans held for sale, at fair value (book value of $11,607 and $10,152, respectively) | 11,600 |  |  | 11,600 |  | 10,200 |  |
Unrealized gain (loss) on loans held for sale |  |  | 168 | 99 |  |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | (60) | 69 |  | 69 | 49 |  |  |
Allowance for credit losses | 9,441 | 10,042 | 9,571 | 9,441 | 10,042 | 10,254 | 10,627 | 9,089
Provision (credit) for loan losses | (136) | (590) |  | (832) | 933 | 1,139 |  |
Non-Accrual Loans | 2,497 |  |  | 2,497 |  | 2,541 |  |
Loans outstanding | 1,762,395 |  |  | 1,762,395 |  | 1,763,378 |  |
Mortgage Loans in Process of Foreclosure, Amount | 657 |  |  | 657 |  | 1,100 |  |
Commercial real estate - non-owner-occupied |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 1,387,593 |  |  | 1,387,593 |  | 1,370,446 |  |
Allowance for credit losses | 15,821 | 16,779 | 15,268 | 15,821 | 16,779 | 16,581 | 16,155 | 17,296
Provision (credit) for loan losses | 552 | 607 |  | (769) | (536) | (734) |  |
Non-Accrual Loans | 130 |  |  | 130 |  | 261 |  |
Loans outstanding | 1,387,593 |  |  | 1,387,593 |  | 1,370,446 |  |
Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 382,507 |  |  | 382,507 |  | 403,901 |  |
Allowance for credit losses | 4,801 | 4,482 | 5,407 | 4,801 | 4,482 | 4,869 | 4,795 | 5,446
Provision (credit) for loan losses | (320) | (247) |  | 819 | (215) | 512 |  |
Non-Accrual Loans | 2,057 |  |  | 2,057 |  | 1,725 |  |
Loans outstanding | 382,507 |  |  | 382,507 |  | 403,901 |  |
Home equity |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 247,968 |  |  | 247,968 |  | 240,341 |  |
Allowance for credit losses | 2,288 | 2,297 | 2,311 | 2,288 | 2,297 | 2,217 | 2,397 | 2,225
Provision (credit) for loan losses | (27) | (101) |  | (14) | 71 | (9) |  |
Non-Accrual Loans | 661 |  |  | 661 |  | 759 |  |
Loans outstanding | 247,968 |  |  | 247,968 |  | 240,341 |  |
Consumer |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 15,936 |  |  | 15,936 |  | 18,168 |  |
Allowance for credit losses | 736 | 645 | $ 689 | 736 | 645 | 724 | $ 658 | $ 504
Provision (credit) for loan losses | 53 | $ 6 |  | 66 | $ 177 | 280 |  |
Non-Accrual Loans | 5 |  |  | 5 |  | 37 |  |
Loans outstanding | 15,936 |  |  | 15,936 |  | 18,168 |  |
Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 382,507 |  |  | 382,507 |  | 403,901 |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 63,122 |  |  | 63,122 |  | 42,164 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 31,023 |  |  | 31,023 |  | 54,911 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 46,740 |  |  | $ 46,740 |  | 56,550 |  |
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  | 13.00% |  |  |  |
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  | 31.00% |  |  |  |
Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  | 12.00% |  |  |  |
Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  | 30.00% |  |  |  |
Substandard [Member] | Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 7,333 |  |  | $ 7,333 |  | 9,033 |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |  |  | 0 |  | 248 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,129 |  |  | 1,129 |  | 588 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 318 |  |  | 318 |  | 296 |  |
Pass [Member] | Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 374,661 |  |  | 374,661 |  | 393,710 |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 62,704 |  |  | 62,704 |  | 41,871 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 29,894 |  |  | 29,894 |  | 54,323 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | $ 46,422 |  |  | $ 46,422 |  | $ 56,102 |  |

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