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Investments (Narrative) (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Investment [Line Items]      
Securities pledged as collateral $ 2,500,000    
Gross realized gain on sale of securities 445,000 480,000  
Proceed from sale of securities 31,539,000 13,184,000  
Gross realized loss on sale of securities 63,000 0  
Fair value of investments reported at less than historical cost     13,300,000
Percentage of Bank portfolio 47.00% 9.00%  
Pooled trust preferred securities, amortized cost 278,861,000   276,326,000
Pooled trust preferred securities, fair value 277,104,000   281,197,000
Pooled Trust Preferred Securities [Member]
     
Investment [Line Items]      
Pooled trust preferred securities, amortized cost 6,745,000    
Pooled trust preferred securities, book value 8,000,000    
Pooled trust preferred securities, fair value $ 3,000,000    
Banks, Thrifts or Other Depository Institutions [Member]
     
Investment [Line Items]      
Collateral recovery probability percentage 10.00%    
Insurance Companies [Member]
     
Investment [Line Items]      
Collateral recovery probability percentage 15.00%