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Securities (Investments' Gross Unrealized Losses and Fair Value) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value $ 150,227 $ 251,615
Less than 12 Months, Unrealized Losses (2,052) (7,462)
12 Months or More, Fair Value 80,540 10,172
12 Months or More, Unrealized Losses (2,025) (314)
Total, Fair Value 230,767 261,787
Total, Unrealized Losses $ (4,077) (7,776)
Debt securities in unrealized loss position in the less than twelve months category | security 145  
Debt securities in unrealized loss position in the twelve months or more category | security 73  
Impairment of investments $ 0  
US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 0 1,997
Less than 12 Months, Unrealized Losses 0 (8)
12 Months or More, Fair Value 1,997  
12 Months or More, Unrealized Losses (6)  
Total, Fair Value 1,997 1,997
Total, Unrealized Losses (6) (8)
States and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 45,387 90,109
Less than 12 Months, Unrealized Losses (483) (3,362)
12 Months or More, Fair Value 24,817 205
12 Months or More, Unrealized Losses (533) (6)
Total, Fair Value 70,204 90,314
Total, Unrealized Losses (1,016) (3,368)
Corporate obligations [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 3,697 6,895
Less than 12 Months, Unrealized Losses (28) (180)
12 Months or More, Fair Value 3,222 0
12 Months or More, Unrealized Losses (37) 0
Total, Fair Value 6,919 6,895
Total, Unrealized Losses (65) (180)
Mortgage-backed securities-government sponsored entities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 101,143 152,614
Less than 12 Months, Unrealized Losses (1,541) (3,912)
12 Months or More, Fair Value 50,504 9,967
12 Months or More, Unrealized Losses (1,449) (308)
Total, Fair Value 151,647 162,581
Total, Unrealized Losses $ (2,990) $ (4,220)