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Earnings Per Common Share (EPS Diluted) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Earnings Per Share, Diluted [Abstract] | |||||||||||
| Net income allocated to common stock | $ 15,638,000 | $ 11,197,000 | $ 5,722,000 | ||||||||
| Adjusted weighted average common shares used in computing basic EPS | 12,398,125 | 12,176,300 | 11,923,663 | ||||||||
| Add: Effect of dilutive stock options | 87,096 | 83,034 | 66,700 | ||||||||
| Adjusted weighted average common shares used in computing diluted EPS | 12,485,221 | 12,259,334 | 11,990,363 | ||||||||
| Diluted earnings per share | $ 0.26 | $ 0.36 | $ 0.34 | $ 0.28 | $ 0.28 | $ 0.27 | $ 0.23 | $ 0.13 | $ 1.25 | $ 0.91 | $ 0.48 |
| Antidilutive securities excluded from computation of earnings per share amount | 23,036 | 44,911 | 322,623 | ||||||||