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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Minimum future rental commitments under noncancellable operating leases [Abstract]    
2018 $ 670  
2019 634  
2020 644  
2021 462  
2022 146  
Due remaining term of the lease 139  
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability 735,678 $ 609,653
Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability $ 20,061 20,444
Letters of Credit [Member] | Minimum [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off balance sheet risks maturity period 1 month  
Letters of Credit [Member] | Maximum [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off balance sheet risks maturity period 60 months  
Performance Guarantees under Interest Rate Swap Contracts Entered into between our Borrowing Customers and Third Parties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, amount, liability $ 759 $ 1,835