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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 41 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 22, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Apr. 19, 2021 | Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares reserved to be issued (in shares) |  | 1,045,000 |  | 1,045,000 |  | 1,045,000 |  |
Number of shares available to be issued under employee stock purchase plan (in shares) |  | 665,000 |  | 665,000 |  | 665,000 |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 978,000 | 416,000
Stock repurchase program, additional number of shares authorized to be repurchased |  |  |  |  |  |  | 562,000 |
Treasury stock, shares acquired (in shares) |  | 125,091 | 3,446 | 236,256 | 35,380 | 949,533 |  |
Acquisition of treasury stock |  |  |  |  |  | $ 21.2 |  |
Acquisition of treasury stock (in usd per share) |  |  |  |  |  | $ 22.36 |  |
Stock repurchase program, shares available for future repurchase |  | 28,467 |  | 28,467 |  | 28,467 |  |
Stock repurchase program percentage of outstanding shares of common stock available for future purchase |  | 0.10% |  | 0.10% |  | 0.10% |  |
Subsequent Event |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) | $ 0.23 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares acquired (in shares) |  | 0 |  | 0 |  |  |  |

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