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Investment Securities (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jul. 19, 2013
Dec. 31, 2012
Investment Securities [Abstract]              
Book value of securities pledged   $ 250,750,000   $ 250,750,000     $ 349,520,000
Securities held to maturity, amortized cost           139,600,000  
Securities held to maturity, fair value   354,000   354,000   134,840,000 454,000
Net after tax loss 3,100,000            
Investment in FHLBB stock   7,496,000   7,496,000     8,145,000
Dividend income on investment in federal home loan bank stock   $ 8,000 $ 8,000 $ 13,000 $ 25,000