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Other Operating Expenses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Operating Expenses [Abstract]      
General and administrative expenses $ 1,905,000 $ 1,545,000 $ 1,759,000
Travel and other employee expenses 1,298,000 1,354,000 1,277,000
Income (Loss) from Equity Method Investments Included in Non-Interest Expense 0    
Partnership income (1) (354,000) (790,000) (481,000)
Other expenses 12,000 129,000 347,000
Total other non-interest expense $ 3,215,000 $ 2,238,000 $ 2,902,000