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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Financial Instruments Outstanding Whose Contract Amounts Represent Credit Risk (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial commitments whose contractual amount represents credit risk |  |
Total | $ 2,324,399 | $ 2,180,227
Commitments to originate new loans |  |
Financial commitments whose contractual amount represents credit risk |  |
Total | 305,474 | 588,034
Unused funds on commercial and other lines of credit |  |
Financial commitments whose contractual amount represents credit risk |  |
Total | 966,523 | 902,598
Unadvanced funds on home equity lines of credit |  |
Financial commitments whose contractual amount represents credit risk |  |
Total | 336,924 | 334,784
Unadvanced funds on construction and real estate loans |  |
Financial commitments whose contractual amount represents credit risk |  |
Total | 694,091 | 340,336
Standby letters of credit |  |
Financial commitments whose contractual amount represents credit risk |  |
Total | $ 21,387 | $ 14,475

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