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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Securities, fair value | $ 565,708 | $ 562,815 | $ 574,230
Common stock, par value | $ 1.00 | $ 1.00 | $ 1.00
Common stock, shares authorized | 20,000,000 | 20,000,000 | 20,000,000
Common stock, shares issued | 15,228,277 | 15,242,308 | 15,145,280
Common stock, shares outstanding | 15,228,277 | 15,242,308 | 15,145,280
Accumulated other comprehensive income, tax | $ 3,169 | $ 3,400 | $ 4,043
Senior preferred stock [Member] |  |  |
Preferred stock, par value | $ 1.00 | $ 1.00 | $ 1.00
Preferred stock, shares authorized | 10,000,000 | 10,000,000 | 10,000,000
Preferred stock, shares issued |  |  |
Cumulative preferred stock [Member] |  |  |
Preferred stock, par value | $ 5.00 | $ 5.00 | $ 5.00
Preferred stock, shares authorized | 900,000 | 900,000 | 900,000
Preferred stock, shares issued |  |  |

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