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Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Interest Rate Derivatives (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net $ 0  
Cash Flow Hedging [Member]    
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Unrealized loss (1,287,000) $ (994,000)
Notional or Contractual Amount 25,774,000 25,774,000
Not designated    
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Asset Derivatives, Fair Value 965,000 960,000
Liability Derivatives, Fair Value 727,000 673,000
Interest rate swap agreements net of swap credit valuation | Not designated    
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Investment securities pledged with financial institutions, dollars $ 4,200,000 $ 6,200,000
Number of correspondent financial institutions where investment securities are pledged | item 2 3
Weighted average maturity 6 years 7 months 6 days 7 years 3 months 18 days
Notional or Contractual Amount $ 153,433,000 $ 85,807,000
Asset Derivatives, Fair Value 727,000 673,000
Liability Derivatives, Fair Value 727,000 673,000
Commitments | Not designated    
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Notional or Contractual Amount 26,978,000 31,980,000
Asset Derivatives, Fair Value 238,000 287,000
Forward MBS contracts and forward loan contracts | Not designated    
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions    
Notional or Contractual Amount $ 16,500,000 $ 19,500,000