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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Assets      
Securities to be held to maturity $ 243,337 $ 243,123 $ 267,247
Shareholders' equity      
Common stock, par value per share (usd per share) $ 0.01 $ 0.01 $ 0.01