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SHAREHOLDERS’ EQUITY AND REGULATORY CAPITAL - Narrative (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 24, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 19, 2016 | 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 |  |  |  |
Aggregate amount provided for under shelf registration |  |  |  |  | $ 100,000,000 |
Outstanding shares of common stock authorized to be repurchased (in shares) |  |  |  |  |  | 416,000
Shares repurchased under the program (in shares) |  | 82,725 |  |  |  |
Total cost of shares repurchased under the program |  | $ 1,438,000 |  |  |  |
Shares repurchased under the program, price per share (in dollars per share) |  | $ 17.38 |  |  |  |
Cash dividend declared by the Board (in dollars per share) |  | $ 0.42 | $ 0.35 | $ 0.22 |  |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividend declared by the Board (in dollars per share) | $ 0.12 |  |  |  |  |
Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Outstanding shares of common stock authorized to be repurchased (as a percent) |  |  |  |  |  | 5.00%

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