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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Basic:        
Net Income $ 6,138 $ 5,143 $ 11,670 $ 11,398
Preferred Dividend (52) (52) (155) (155)
Earnings Applicable to Common Stock 6,086 5,091 11,515 11,243
Weighted-average number of basic shares outstanding, shares 15,741,000 15,622,000 15,717,000 15,599,000
Basic EPS $ 0.39 $ 0.33 $ 0.73 $ 0.72
Diluted:        
Earnings Applicable to Common Stock 6,086 5,091 11,515 11,243
$7.00 Series Preferred Dividend 24 24 73 73
$8.00 Series Preferred Dividend 14 14 42 42
Adjusted Earnings Applicable to Common Stock $ 6,124 $ 5,129 $ 11,630 $ 11,358
Weighted-average number of basic shares outstanding, shares 15,741,000 15,622,000 15,717,000 15,599,000
Incremental common shares attributable to $7.00 series preferred shares, shares 167,000 167,000 167,000 167,000
Incremental common shares attributable to $8.00 series preferred shares, shares 96,000 96,000 96,000 96,000
Weighted-average diluted shares outstanding, shares 16,004,000 15,885,000 15,980,000 15,862,000
Diluted EPS $ 0.38 $ 0.32 $ 0.73 $ 0.72