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Fair Value Presentation (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable equity securities, market value $ 5,737 $ 5,583 $ 5,574
Impaired Financing Receivable, Recorded Investment 2,165 1,812 2,145
Related Allowance 79
CRA Investment Fund [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable equity securities, book value 5,341 5,280  
Marketable equity securities, market value 5,341 5,280  
Regulatory Bank Stock [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable equity securities, book value 368 267  
Marketable equity securities, market value $ 396 $ 303