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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Repurchased of common stock shares |  |  | $ 3,305
Common stock issued in public stock offering, Shares |  | 6,325 |
Retained Earnings [Member] |  |  |
Cash dividends declared, per common share | $ 0.96 | $ 0.96 | $ 0.96

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