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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details)
$ in Thousands
Sep. 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 30 149
Available-for-sale securities, Less than 12 Months: Fair Value $ 40,924 $ 118,601
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 419 $ 4,453
Available-for-sale securities, 12 Months or More: Number of Securities | security 59 2
Available-for-sale securities, 12 Months or More: Fair Value $ 50,119 $ 1,056
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 1,285 $ 112
Available-for-sale securities, Total: Number of Securities | security 89 151
Available-for-sale securities, Total: Fair Value $ 91,043 $ 119,657
Available-for-sale securities, Total: Unrealized Losses $ 1,704 $ 4,565
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 33  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 31,220  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 150  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 33  
Held-to-maturity securities, Total: Fair Value $ 31,220  
Held-to-maturity securities, Total: Unrealized Losses $ 150  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security 63  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value $ 72,144  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 569  
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security 59  
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value $ 50,119  
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 1,285  
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security 122  
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value $ 122,263  
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses $ 1,854  
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 7 23
Available-for-sale securities, Less than 12 Months: Fair Value $ 15,790 $ 43,698
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 237 $ 1,542
Available-for-sale securities, 12 Months or More: Number of Securities | security 14 0
Available-for-sale securities, 12 Months or More: Fair Value $ 23,462  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 643  
Available-for-sale securities, Total: Number of Securities | security 21 23
Available-for-sale securities, Total: Fair Value $ 39,252 $ 43,698
Available-for-sale securities, Total: Unrealized Losses $ 880 $ 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 $ 4,989  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 7  
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 $ 4,989  
Held-to-maturity securities, Total: Unrealized Losses $ 7  
Mortgage-backed U.S. Government Agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 11 18
Available-for-sale securities, Less than 12 Months: Fair Value $ 18,279 $ 24,321
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 141 $ 579
Available-for-sale securities, 12 Months or More: Number of Securities | security 9 0
Available-for-sale securities, 12 Months or More: Fair Value $ 9,718  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 194  
Available-for-sale securities, Total: Number of Securities | security 20 18
Available-for-sale securities, Total: Fair Value $ 27,997 $ 24,321
Available-for-sale securities, Total: Unrealized Losses $ 335 $ 579
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 11  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 18,676  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 102  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 11  
Held-to-maturity securities, Total: Fair Value $ 18,676  
Held-to-maturity securities, Total: Unrealized Losses $ 102  
State and political subdivision obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 12 108
Available-for-sale securities, Less than 12 Months: Fair Value $ 6,855 $ 50,582
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 41 $ 2,332
Available-for-sale securities, 12 Months or More: Number of Securities | security 35 0
Available-for-sale securities, 12 Months or More: Fair Value $ 16,428  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 409  
Available-for-sale securities, Total: Number of Securities | security 47 108
Available-for-sale securities, Total: Fair Value $ 23,283 $ 50,582
Available-for-sale securities, Total: Unrealized Losses $ 450 $ 2,332
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 20  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 7,555  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 41  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 20  
Held-to-maturity securities, Total: Fair Value $ 7,555  
Held-to-maturity securities, Total: Unrealized Losses $ 41  
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 $ 511 $ 1,056
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 39 $ 112
Available-for-sale securities, Total: Number of Securities | security 1 2
Available-for-sale securities, Total: Fair Value $ 511 $ 1,056
Available-for-sale securities, Total: Unrealized Losses $ 39 $ 112