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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Assets |  |  |
Securities to be held to maturity, fair value | $ 174,790 | $ 150,247 | $ 143,628
Shareholders' equity |  |  |
Perferred stock, preference value per share (usd per share) | $ 1,000 | $ 1,000 | $ 1,000
Common stock, par value per share (usd per share) | $ 0.01 | $ 0.01 | $ 0.01

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