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Securities (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Securities [Abstract]      
Collateralized mortage obligations, amortized cost $ 34,500 $ 108,000  
Collateralized mortage obligations, fair value 34,800 111,000  
Investment securities, pledged as collateral for public deposits 141,379,000 100,113,000  
Sales of investment securities   47,473,000 $ 12,908,000
Net realized gains (losses) of investment securities (1,000) 786,000 $ 525,000
Federal Home Loan Bank stock and Federal Reserve Bank stock, cost 15,893,000 6,016,000  
Federal Home Loan Bank Stock, cost 8,846,000 $ 6,016,000  
Federal Reserve Bank, cost $ 7,047,000