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LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from the sale of mortgage loans | $ 41,913 | $ 35,501 |  |
Gain on sale of mortgage loans | (470) | (384) |  |
Loans held for sale, at fair value (book value of $9,441 and $10,152, respectively) | 9,524 |  | $ 10,320 |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 1,300 |  |  |
Allowance for credit losses | 35,613 | 37,134 | 36,935 | $ 36,922
(Credit) provision for loan losses | $ (1,164) | 439 | 1,174 |
Other industry exposures | 0 |  |  |
Non-Accrual Loans | $ 5,658 |  | 5,448 |
Loans outstanding | 4,121,040 |  | 4,098,094 |
Interest lost on nonaccrual loans | 43 | 25 |  |
Loans and Leases Receivable, Excluded Accrued Interest from Amortized Cost | 13,000 |  | 12,700 |
FHLB advances, general debt obligations, pledged collateral | 1,900,000 |  |  |
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,762,482 |  | 1,763,378 |
Proceeds from the sale of mortgage loans | 41,400 | 35,100 |  |
Gain on sale of mortgage loans | (470) | (384) |  |
Loans held for sale, at fair value (book value of $9,441 and $10,152, respectively) | 9,400 |  | 10,200 |
Unrealized gain (loss) on loans held for sale | 83 |  | 168 |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | (85) | 85 |  |
Allowance for credit losses | 10,565 | 10,812 | 10,254 | 9,089
(Credit) provision for loan losses | 305 | 1,737 | 1,139 |
Non-Accrual Loans | 2,473 |  | 2,541 |
Loans outstanding | 1,762,482 |  | 1,763,378 |
Mortgage Loans in Process of Foreclosure, Amount | 952 |  | 1,100 |
Commercial real estate - non-owner-occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,402,326 |  | 1,370,446 |
Allowance for credit losses | 15,294 | 16,324 | 16,581 | 17,296
(Credit) provision for loan losses | (1,294) | (973) | (734) |
Non-Accrual Loans | 82 |  | 261 |
Loans outstanding | 1,402,326 |  | 1,370,446 |
Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 1,300 |  |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 397,395 |  | 403,901 |
Allowance for credit losses | 4,460 | 4,581 | 4,869 | 5,446
(Credit) provision for loan losses | (192) | (652) | 512 |
Non-Accrual Loans | 1,980 |  | 1,725 |
Loans outstanding | 397,395 |  | 403,901 |
Home equity |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 240,674 |  | 240,341 |
Allowance for credit losses | 2,360 | 2,440 | 2,217 | 2,225
(Credit) provision for loan losses | 63 | 215 | (9) |
Non-Accrual Loans | 994 |  | 759 |
Loans outstanding | 240,674 |  | 240,341 |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 17,537 |  | 18,168 |
Allowance for credit losses | 704 | 507 | 724 | $ 504
(Credit) provision for loan losses | 14 | $ 4 | 280 |
Non-Accrual Loans | 6 |  | 37 |
Loans outstanding | 17,537 |  | 18,168 |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 397,395 |  | 403,901 |
Financing Receivable, Year One, Originated, Current Fiscal Year | 6,841 |  | 42,164 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 39,972 |  | 54,911 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | $ 52,815 |  | 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) | 32.00% |  |  |
Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk (percentage) | 11.00% |  |  |
Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Concentration risk (percentage) | 28.00% |  |  |
Substandard [Member] | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 8,377 |  | 9,033 |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |  | 248 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 234 |  | 588 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 484 |  | 296 |
Pass [Member] | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 387,928 |  | 393,710 |
Financing Receivable, Year One, Originated, Current Fiscal Year | 6,841 |  | 41,871 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 39,680 |  | 54,323 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | $ 52,095 |  | $ 56,102 |

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