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SHAREHOLDERS’ EQUITY AND REGULATORY CAPITAL - Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 19, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 19, 2021 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Common stock reserved to be issued under dividend reinvestment and stock purchase plan (in shares) |  | 1,045,000 |  |  |  |
Shares available to be issued under the plan (in shares) |  | 665,000 |  |  |  |
Outstanding shares of common stock authorized to be repurchased (in shares) |  |  |  |  |  | 416,000
Number of additional shares authorized to be repurchased |  |  |  |  | 562,000 |
Shares repurchased under the program (in shares) |  | 234,170 |  |  |  |
Total cost of shares repurchased under the program |  | $ 4.5 |  |  |  |
Shares repurchased under the program, price per share (in dollars per share) |  | $ 19.08 |  |  |  |
Cash dividend declared by the Board (in dollars per share) |  | $ 0.74 | $ 0.68 | $ 0.60 |  |
Amount available for dividend distribution |  | $ 56.3 |  |  |  |
Maximum amount available to loan nonbank affiliates |  | $ 27.9 |  |  |  |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividend declared by the Board (in dollars per share) | $ 0.19 |  |  |  |  |
Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Outstanding shares of common stock authorized to be repurchased (as a percent) |  |  |  |  |  | 5.00%

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