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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, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 28 18
Available-for-sale securities, Less than 12 Months: Fair Value $ 27,006 $ 16,419
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 656 $ 361
Available-for-sale securities, 12 Months or More: Number of Securities | security 84 74
Available-for-sale securities, 12 Months or More: Fair Value $ 79,526 $ 73,816
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 5,694 $ 2,386
Available-for-sale securities, Total: Number of Securities | security 112 92
Available-for-sale securities, Total: Fair Value $ 106,532 $ 90,235
Available-for-sale securities, Total: Unrealized Losses $ 6,350 $ 2,747
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 211 0
Held-to-maturity securities, Less than 12 Months: Fair Value $ 130,332  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 3,226  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 34 116
Held-to-maturity securities, 12 Months or More: Fair Value $ 28,495 $ 93,819
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 1,201 $ 914
Held-to-maturity securities, Total: Number of Securities | security 245 116
Held-to-maturity securities, Total: Fair Value $ 158,827 $ 93,819
Held-to-maturity securities, Total: Unrealized Losses $ 4,427 $ 914
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security 239 18
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value $ 157,338 $ 16,419
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 3,882 $ 361
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security 118 190
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value $ 108,021 $ 167,635
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 6,895 $ 3,300
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security 357 208
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value $ 265,359 $ 184,054
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses $ 10,777 $ 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 1 3
Available-for-sale securities, Less than 12 Months: Fair Value $ 484 $ 5,008
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 4 $ 184
Available-for-sale securities, 12 Months or More: Number of Securities | security 21 18
Available-for-sale securities, 12 Months or More: Fair Value $ 37,466 $ 33,722
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 2,636 $ 1,211
Available-for-sale securities, Total: Number of Securities | security 22 21
Available-for-sale securities, Total: Fair Value $ 37,950 $ 38,730
Available-for-sale securities, Total: Unrealized Losses $ 2,640 $ 1,395
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 4  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 9,313  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 206  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 2 4
Held-to-maturity securities, 12 Months or More: Fair Value $ 4,942 $ 10,894
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 55 $ 90
Held-to-maturity securities, Total: Number of Securities | security 6 4
Held-to-maturity securities, Total: Fair Value $ 14,255 $ 10,894
Held-to-maturity securities, Total: Unrealized Losses $ 261 $ 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 12 4
Available-for-sale securities, Less than 12 Months: Fair Value $ 18,385 $ 5,267
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 360 $ 75
Available-for-sale securities, 12 Months or More: Number of Securities | security 18 15
Available-for-sale securities, 12 Months or More: Fair Value $ 21,777 $ 20,497
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 1,130 $ 494
Available-for-sale securities, Total: Number of Securities | security 30 19
Available-for-sale securities, Total: Fair Value $ 40,162 $ 25,764
Available-for-sale securities, Total: Unrealized Losses $ 1,490 $ 569
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 35  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 49,974  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 1,279  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 12 35
Held-to-maturity securities, 12 Months or More: Fair Value $ 16,406 $ 52,949
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 719 $ 523
Held-to-maturity securities, Total: Number of Securities | security 47 35
Held-to-maturity securities, Total: Fair Value $ 66,380 $ 52,949
Held-to-maturity securities, Total: Unrealized Losses $ 1,998 $ 523
State and political subdivision obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 14 11
Available-for-sale securities, Less than 12 Months: Fair Value $ 7,144 $ 6,144
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 285 $ 102
Available-for-sale securities, 12 Months or More: Number of Securities | security 45 40
Available-for-sale securities, 12 Months or More: Fair Value $ 20,283 $ 19,091
Available-for-sale securities, 12 Months or More: Unrealized Losses $ 1,928 $ 637
Available-for-sale securities, Total: Number of Securities | security 59 51
Available-for-sale securities, Total: Fair Value $ 27,427 $ 25,235
Available-for-sale securities, Total: Unrealized Losses $ 2,213 $ 739
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 171  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 69,513  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 1,730  
Held-to-maturity securities, 12 Months or More: Number of Securities | security 20 77
Held-to-maturity securities, 12 Months or More: Fair Value $ 7,147 $ 29,976
Held-to-maturity securities, 12 Months or More: Unrealized Losses $ 427 $ 301
Held-to-maturity securities, Total: Number of Securities | security 191 77
Held-to-maturity securities, Total: Fair Value $ 76,660 $ 29,976
Held-to-maturity securities, Total: Unrealized Losses $ 2,157 $ 301
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, 12 Months or More: Number of Securities | security   1
Available-for-sale securities, 12 Months or More: Fair Value   $ 506
Available-for-sale securities, 12 Months or More: Unrealized Losses   $ 44
Available-for-sale securities, Total: Number of Securities | security   1
Available-for-sale securities, Total: Fair Value   $ 506
Available-for-sale securities, Total: Unrealized Losses   $ 44
Corporate debt securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Less than 12 Months: Number of Securities | security 1  
Available-for-sale securities, Less than 12 Months: Fair Value $ 993  
Available-for-sale securities, Less than 12 Months: Unrealized Losses $ 7  
Available-for-sale securities, Total: Number of Securities | security 1  
Available-for-sale securities, Total: Fair Value $ 993  
Available-for-sale securities, Total: Unrealized Losses $ 7  
Held-to-maturity securities, Less than 12 Months: Number of Securities | security 1  
Held-to-maturity securities, Less than 12 Months: Fair Value $ 1,532  
Held-to-maturity securities, Less than 12 Months: Unrealized Losses $ 11  
Held-to-maturity securities, Total: Number of Securities | security 1  
Held-to-maturity securities, Total: Fair Value $ 1,532  
Held-to-maturity securities, Total: Unrealized Losses $ 11