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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Retained Earnings [Member] |  |
Dividends, per share (in dollars per share) | $ 0.56 | $ 0.55
AOCI Attributable to Parent [Member] |  |
Other comprehensive income (loss), tax | $ 1,454 | $ 2,152
Dividends, per share (in dollars per share) | $ 0.56 | $ 0.55
Other comprehensive income (loss), tax | $ 1,454 | $ 2,152

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