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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Securities available-for-sale at amortized cost | $ 571,539 | $ 638,395
Securities held-to-maturity at fair value | 1,651 | 1,644
Core deposit intangible, accumulated amortization | $ 8,285 | $ 8,138
Shareholders' equity: |  |
Preferred stock, shares authorized (in shares) | 300,000 | 300,000
Common stock, par value (in dollars per share) | $ 5 | $ 5
Common stock, shares authorized (in shares) | 25,000,000 | 25,000,000
Common stock, shares outstanding (in shares) | 17,513,449 | 17,466,375

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