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Securities (Investments' Gross Unrealized Losses and Fair Value) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Schedule of Investments [Line Items]    
Debt securities in unrealized loss position in the less than twelve months category | security 235  
Debt securities in unrealized loss position in the twelve months or more category | security 12  
Impairment of investments $ 0  
U.S. Government Agencies [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 1,997 $ 6,058
Less than 12 Months, Unrealized Losses (8) (71)
12 Months or More, Fair Value 0 2,109
12 Months or More, Unrealized Losses 0 (37)
Total, Fair Value 1,997 8,167
Total, Unrealized Losses (8) (108)
States and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 90,109 9,086
Less than 12 Months, Unrealized Losses (3,362) (99)
12 Months or More, Fair Value 205 1,417
12 Months or More, Unrealized Losses (6) (13)
Total, Fair Value 90,314 10,503
Total, Unrealized Losses (3,368) (112)
Corporate obligations [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 6,895 2,221
Less than 12 Months, Unrealized Losses (180) (4)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 6,895 2,221
Total, Unrealized Losses (180) (4)
Mortgage-backed securities-government sponsored entities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 152,614 40,300
Less than 12 Months, Unrealized Losses (3,912) (432)
12 Months or More, Fair Value 9,967 16,595
12 Months or More, Unrealized Losses (308) (513)
Total, Fair Value 162,581 56,895
Total, Unrealized Losses (4,220) (945)
Total Debt Securities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 251,615 57,665
Less than 12 Months, Unrealized Losses (7,462) (606)
12 Months or More, Fair Value 10,172 20,121
12 Months or More, Unrealized Losses (314) (563)
Total, Fair Value 261,787 77,786
Total, Unrealized Losses $ (7,776) $ (1,169)