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Quarterly Results of Operations (Unaudited)
12 Months Ended
Dec. 31, 2012
Quarterly Results of Operations (Unaudited) [Abstract]  
Quarterly Results of Operations (Unaudited)

21. Quarterly Results of Operations (Unaudited)

The following table presents a summary of the quarterly results of operations for 2012 and 2011:

    2012   2011
     First   Second   Third   Fourth   First   Second   Third   Fourth
Interest income   $ 22,965     $ 22,797     $ 22,636     $ 22,549     $ 24,860     $ 25,645     $ 24,386     $ 23,481  
Interest expense     4,594       4,431       4,189       3,988       6,301       6,082       5,739       5,031  
Net interest income     18,371       18,366       18,447       18,561       18,559       19,563       18,647       18,450  
Provision for credit losses     1,005       835       868       1,108       1,119       970       1,182       1,464  
Non-interest income     5,228       5,754       5,038       7,392       5,118       5,006       5,825       7,104  
Non-interest expense     12,919       13,979       13,370       18,763       13,285       13,272       13,307       15,715  
Income before income taxes
    9,675       9,306       9,247       6,082       9,273       10,327       9,983       8,375  
Income tax expense     3,092       2,894       2,992       1,904       2,934       3,257       3,054       2,536  
Net income   $ 6,583     $ 6,412     $ 6,255     $ 4,178     $ 6,339     $ 7,070     $ 6,929     $ 5,839  
Per common share:
                                                                       
Basic   $ 0.86     $ 0.83     $ 0.82     $ 0.55     $ 0.83     $ 0.92     $ 0.90     $ 0.76  
Diluted   $ 0.86     $ 0.83     $ 0.82     $ 0.55     $ 0.83     $ 0.92     $ 0.90     $ 0.76