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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 19, 2021 | Mar. 31, 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) |  | 154,680 |
Acquisition of treasury stock |  | $ 2.6 |
Acquisition of treasury stock (in usd per share) |  | $ 16.88 |
Stock repurchase program, shares available for future repurchase |  | 823,320 |
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] |  |  |
Stock repurchase program, additional number of shares authorized to be repurchased | 562,000 |  |
Dividends declared per share (in usd per share) | $ 0.18 |  |
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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