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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 18, 2021 | Sep. 30, 2021 | Apr. 19, 2021 | Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 416,000
Acquisition of treasury stock (in shares) |  | 201,518 |  |
Acquisition of treasury stock |  | $ 3.7 |  |
Acquisition of treasury stock (in usd per share) |  | $ 18.26 |  |
Stock repurchase program, additional number of shares authorized to be repurchased |  |  | 562,000 |
Stock repurchase program, shares available for future repurchase |  | 776,482 |  |
Stock repurchase program percentage of outstanding shares of common stock available for future purchase |  | 7.00% |  |
Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Dividends declared per share (in usd per share) | $ 0.19 |  |  |
Maximum |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program authorized, maximum percentage of outstanding shares of common stock |  |  |  | 5.00%

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