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Goodwill and Other Intangible Assets (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill And Other Intangible Assets (Additional Textual) [Abstract]      
Amortization of Intangible Assets $ 2,400,000 $ 1,600,000 $ 1,500,000
Aggregate fair value of mortgage servicing rights 4,200,000 2,800,000  
Goodwill 56,238,000 53,169,000 51,320,000
Maximum [Member]
     
Goodwill and Other Intangible Assets (Textual) [Abstract]      
Range of fair value of mortgage servicing rights using discount rates 10.00% 10.00%  
Minimum [Member]
     
Goodwill and Other Intangible Assets (Textual) [Abstract]      
Range of fair value of mortgage servicing rights using discount rates 5.00% 5.00%  
Javers Group [Member]
     
Goodwill and Other Intangible Assets (Textual) [Abstract]      
Additional goodwill 3,069,000    
Customer related intangibles 989,000    
Trollinger Consulting Group [Member]
     
Goodwill and Other Intangible Assets (Textual) [Abstract]      
Additional goodwill   1,849,000  
Customer related intangibles [Member]
     
Goodwill and Other Intangible Assets (Textual) [Abstract]      
Impairment on customer related intangibles $ 31,000 $ 11,000 $ 0