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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loan Summary (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Loans receivable, net |  |  |  |  |  |
Loans | $ 9,450,066 |  | $ 8,809,394 |  |  |
Allowance for credit losses | (64,945) | $ (63,284) | (61,059) | $ (60,363) | $ (55,542) | $ (49,869)
Loans, net of allowance for credit losses | 9,385,121 |  | 8,748,335 |  |  |
Business lending |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 3,914,935 |  | 3,645,665 |  |  |
Consumer mortgage |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 3,196,764 |  | 3,012,475 |  |  |
Consumer indirect |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 1,708,302 |  | 1,539,653 |  |  |
Consumer direct |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 185,301 |  | 177,605 |  |  |
Home equity |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 444,764 |  | 433,996 |  |  |
Commercial Portfolio Segment | Business lending |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 3,914,935 |  | 3,645,665 |  |  |
Allowance for credit losses | (26,044) | (25,291) | (23,297) | (23,931) | (23,241) | (22,995)
Residential Portfolio Segment | Consumer mortgage |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 3,196,764 |  | 3,012,475 |  |  |
Allowance for credit losses | (14,971) | (14,553) | (14,343) | (13,818) | (12,631) | (10,017)
Residential Portfolio Segment | Home equity |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 444,764 |  | 433,996 |  |  |
Allowance for credit losses | (1,594) | (1,600) | (1,594) | (1,581) | (1,470) | (1,814)
Consumer Portfolio Segment | Consumer indirect |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 1,708,302 |  | 1,539,653 |  |  |
Allowance for credit losses | (18,290) | (17,808) | (17,852) | (17,018) | (14,378) | (11,737)
Consumer Portfolio Segment | Consumer direct |  |  |  |  |  |
Loans receivable, net |  |  |  |  |  |
Loans | 185,301 |  | 177,605 |  |  |
Allowance for credit losses | $ (3,046) | $ (3,032) | $ (2,973) | $ (3,015) | $ (2,822) | $ (2,306)

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