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INVESTMENT SECURITIES - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available-for-sale, unrealized loss position, allowance for credit loss | $ 0 |  | $ 0 |  | $ 0
Investment securities gains | 50,000 | $ 271,000 | 71,000 | $ 254,000 |
Gain on sale of investment securities | 44,000 |  |  |  |
Investment securities | 890,357,000 |  | 890,357,000 |  | 829,711,000
Investment securities gain (loss) |  | 0 |  | 0 |
Collateral Pledged |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities pledged to secure public funds, fair value | 645,000,000.0 |  | 645,000,000.0 |  | $ 669,200,000
Debt Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities gains | 50,000 |  | 71,000 |  |
Investment securities | $ 41,600,000 |  | $ 41,600,000 |  |
Debt Securities | Codorus Valley |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities |  | 162,700,000 |  | 162,700,000 |
Equity Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities gains |  | 271,000 |  | $ 254,000 |
Gain on equity security |  | $ 181,000 |  |  |

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