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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]          
Cumulative dividends declared per common share (in dollars per share) $ 0.18 $ 0.18 $ 0.54 $ 0.54 $ 0.72