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Derivative Instruments (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Notional amount $ 2,209,000   $ 2,209,000   $ 2,280,000
Fair value of yield maintenance provisions 82,000   82,000   122,000
Interest Rate Swap [Member]          
Derivative [Line Items]          
Notional amount 2,209,000   2,209,000   2,280,000
Net gains (losses) recognized in earnings 0 $ 0 0 $ 0  
Interest Rate Lock Commitments [Member]          
Derivative [Line Items]          
Notional amount 2,365,000   2,365,000   2,164,000
Fair value of yield maintenance provisions 10,000   10,000   $ 9,000
CF Bank [Member]          
Derivative [Line Items]          
Securities pledged as collateral $ 663,000   $ 663,000