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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 87 149
Available-for-sale securities, Less than 12 Months: Fair Value $ 89,664 $ 118,601
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 1,524 $ 4,453
Available-for-sale securities, 12 Months or More: Number of Securities | security 10 2
Available-for-sale securities, 12 Months or More: Fair Value $ 7,624 $ 1,056
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 195 $ 112
Available-for-sale securities, Total: Number of Securities | security 97 151
Available-for-sale securities, Total: Fair Value $ 97,288 $ 119,657
Available-for-sale securities, Total: Unrealized Losses $ 1,719 $ 4,565
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 19  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 29,406  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 113  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 19  
Held-to-maturity securities, Total: Fair Value $ 29,406  
Held-to-maturity securities, Total: Unrealized Losses $ 113  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security 106  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value $ 119,070  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 1,637  
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security 10  
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value $ 7,624  
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 195  
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security 116  
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value $ 126,694  
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses $ 1,832  
U.S. Treasury and U.S. government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 21 23
Available-for-sale securities, Less than 12 Months: Fair Value $ 39,077 $ 43,698
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 852 $ 1,542
Available-for-sale securities, 12 Months or More: Number of Securities | security 1 0
Available-for-sale securities, 12 Months or More: Fair Value $ 2,694  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 6  
Available-for-sale securities, Total: Number of Securities | security 22 23
Available-for-sale securities, Total: Fair Value $ 41,771 $ 43,698
Available-for-sale securities, Total: Unrealized Losses $ 858 $ 1,542
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 2  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 4,991  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 5  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 2  
Held-to-maturity securities, Total: Fair Value $ 4,991  
Held-to-maturity securities, Total: Unrealized Losses $ 5  
Mortgage-backed U.S. Government Agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 18 18
Available-for-sale securities, Less than 12 Months: Fair Value $ 26,466 $ 24,321
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 291 $ 579
Available-for-sale securities, 12 Months or More: Number of Securities | security 1 0
Available-for-sale securities, 12 Months or More: Fair Value $ 535  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 16  
Available-for-sale securities, Total: Number of Securities | security 19 18
Available-for-sale securities, Total: Fair Value $ 27,001 $ 24,321
Available-for-sale securities, Total: Unrealized Losses $ 307 $ 579
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 14  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 22,879  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 99  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 14  
Held-to-maturity securities, Total: Fair Value $ 22,879  
Held-to-maturity securities, Total: Unrealized Losses $ 99  
State and political subdivision obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 48 108
Available-for-sale securities, Less than 12 Months: Fair Value $ 24,121 $ 50,582
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 381 $ 2,332
Available-for-sale securities, 12 Months or More: Number of Securities | security 7 0
Available-for-sale securities, 12 Months or More: Fair Value $ 3,845  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 133  
Available-for-sale securities, Total: Number of Securities | security 55 108
Available-for-sale securities, Total: Fair Value $ 27,966 $ 50,582
Available-for-sale securities, Total: Unrealized Losses $ 514 $ 2,332
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 3  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 1,536  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 9  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 3  
Held-to-maturity securities, Total: Fair Value $ 1,536  
Held-to-maturity securities, Total: Unrealized Losses $ 9  
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 0 0
Available-for-sale securities, 12 Months or More: Number of Securities | security 1 2
Available-for-sale securities, 12 Months or More: Fair Value $ 550 $ 1,056
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 40 $ 112
Available-for-sale securities, Total: Number of Securities | security 1 2
Available-for-sale securities, Total: Fair Value $ 550 $ 1,056
Available-for-sale securities, Total: Unrealized Losses $ 40 $ 112