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Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]    
Carrying Value of Federal Funds Purchased, Securities Sold under Agreements to Repurchase, and Deposits Received for Securities Loaned $ 901 $ 768
Federal Home Loan Bank Advances [Member] | Period One [Member]    
Federal Home Loan Bank, Advances [Line Items]    
Debt, Long-term and Short-term, Combined Amount 50,000 60,000
Collateral Pledged [Member]    
Federal Home Loan Bank, Advances [Line Items]    
Available-for-sale Securities Pledged as Collateral $ 3,200 $ 3,700