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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Assets: |  |
Securities available-for-sale at fair value (amortized cost) | $ 598,878 | $ 511,731
Securities held-to-maturity at amortized cost (fair value) | 1,664 | 1,661
Core deposit intangible (accumulated amortization) | $ 7,659 | $ 7,499
Shareholders' equity: |  |
Preferred stock, shares authorized (in shares) | 300,000 | 300,000
Preferred stock, shares unissued (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) | 15,604,383 | 15,429,992

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