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Investment Securities (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]          
Proceeds from sales of available for sale debt securities $ 22,670,000 $ 54,990,000 $ 64,340,000 $ 132,020,000  
Available-for-sale securities, gross realized gains 36,000 970,000 530,000 1,190,000  
Available-for-sale securities, gross realized losses 62,000 50,000 108,000 141,000  
Investment in FHLBB stock         8,630,000
Investment in FHLBB stock, period decrease     485,000 0  
Dividend income on investment in federal home loan bank stock 11,000 6,000 36,000 19,000  
Non-Agency CMO Portfolio [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Number of investment securities     2    
Cost basis 4,750,000   4,750,000    
Non-Agency CMO Portfolio [Member] | Bond 1 [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Cost basis 3,150,000   3,150,000    
Bond, fair value 3,130,000   3,130,000    
Non-Agency CMO Portfolio [Member] | Bond 2 [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Cost basis 1,600,000   1,600,000    
Bond, fair value $ 1,610,000   $ 1,610,000