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Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details)
$ in Thousands
Dec. 31, 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 18 149
Available-for-sale securities, Less than 12 Months: Fair Value $ 16,419 $ 118,601
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 361 $ 4,453
Available-for-sale securities, 12 Months or More: Number of Securities | security 74 2
Available-for-sale securities, 12 Months or More: Fair Value $ 73,816 $ 1,056
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 2,386 $ 112
Available-for-sale securities, Total: Number of Securities | security 92 151
Available-for-sale securities, Total: Fair Value $ 90,235 $ 119,657
Available-for-sale securities, Total: Unrealized Losses $ 2,747 $ 4,565
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 0  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 116  
Held-to-maturity securities, 12 Months or More: Fair Value $ 93,819  
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 914  
Held-to-maturity securities, Total: Number of Securities | security 116  
Held-to-maturity securities, Total: Fair Value $ 93,819  
Held-to-maturity securities, Total: Unrealized Losses $ 914  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security 18  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value $ 16,419  
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 361  
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security 190  
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value $ 167,635  
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 3,300  
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security 208  
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value $ 184,054  
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses $ 3,661  
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 3 23
Available-for-sale securities, Less than 12 Months: Fair Value $ 5,008 $ 43,698
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 184 $ 1,542
Available-for-sale securities, 12 Months or More: Number of Securities | security 18 0
Available-for-sale securities, 12 Months or More: Fair Value $ 33,722  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 1,211  
Available-for-sale securities, Total: Number of Securities | security 21 23
Available-for-sale securities, Total: Fair Value $ 38,730 $ 43,698
Available-for-sale securities, Total: Unrealized Losses $ 1,395 $ 1,542
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 0  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 4  
Held-to-maturity securities, 12 Months or More: Fair Value $ 10,894  
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 90  
Held-to-maturity securities, Total: Number of Securities | security 4  
Held-to-maturity securities, Total: Fair Value $ 10,894  
Held-to-maturity securities, Total: Unrealized Losses $ 90  
Mortgage-backed U.S. Government Agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 4 18
Available-for-sale securities, Less than 12 Months: Fair Value $ 5,267 $ 24,321
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 75 $ 579
Available-for-sale securities, 12 Months or More: Number of Securities | security 15 0
Available-for-sale securities, 12 Months or More: Fair Value $ 20,497  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 494  
Available-for-sale securities, Total: Number of Securities | security 19 18
Available-for-sale securities, Total: Fair Value $ 25,764 $ 24,321
Available-for-sale securities, Total: Unrealized Losses $ 569 $ 579
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 0  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 35  
Held-to-maturity securities, 12 Months or More: Fair Value $ 52,949  
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 523  
Held-to-maturity securities, Total: Number of Securities | security 35  
Held-to-maturity securities, Total: Fair Value $ 52,949  
Held-to-maturity securities, Total: Unrealized Losses $ 523  
State and political subdivision obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 11 108
Available-for-sale securities, Less than 12 Months: Fair Value $ 6,144 $ 50,582
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 102 $ 2,332
Available-for-sale securities, 12 Months or More: Number of Securities | security 40 0
Available-for-sale securities, 12 Months or More: Fair Value $ 19,091  
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 637  
Available-for-sale securities, Total: Number of Securities | security 51 108
Available-for-sale securities, Total: Fair Value $ 25,235 $ 50,582
Available-for-sale securities, Total: Unrealized Losses $ 739 $ 2,332
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 0  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 77  
Held-to-maturity securities, 12 Months or More: Fair Value $ 29,976  
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 301  
Held-to-maturity securities, Total: Number of Securities | security 77  
Held-to-maturity securities, Total: Fair Value $ 29,976  
Held-to-maturity securities, Total: Unrealized Losses $ 301  
Corporate debt 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 0 0
Available-for-sale securities, Total: Number of Securities | security 0 0
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 0  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 0  
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 $ 506 $ 1,056
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 44 $ 112
Available-for-sale securities, Total: Number of Securities | security 1 2
Available-for-sale securities, Total: Fair Value $ 506 $ 1,056
Available-for-sale securities, Total: Unrealized Losses $ 44 $ 112
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 0  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 0  
Held-to-maturity securities, Total: Number of Securities | security 0