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Securities (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Securities with unrealized loss position    
Less than 12 Months, Fair Value $ 111,405 $ 64,788
Less than 12 Months, Unrealized Losses (2,133) (397)
12 Months or More, Fair Value 429 5,440
12 Months or More, Unrealized Losses (9) (67)
Total, Fair Value 111,834 70,228
Total, Unrealized Losses (2,142) (464)
U.S. Government and federal agency [Member]    
Securities with unrealized loss position    
Less than 12 Months, Fair Value 46,283 38,567
Less than 12 Months, Unrealized Losses (846) (216)
12 Months or More, Fair Value   986
12 Months or More, Unrealized Losses   (13)
Total, Fair Value 46,283 39,553
Total, Unrealized Losses (846) (229)
U.S. Treasury notes and bonds [Member]    
Securities with unrealized loss position    
Less than 12 Months, Fair Value 4,072 6,101
Less than 12 Months, Unrealized Losses (39) (33)
Total, Fair Value 4,072 6,101
Total, Unrealized Losses (39) (33)
State and municipal [Member]    
Securities with unrealized loss position    
Less than 12 Months, Fair Value 47,832 10,382
Less than 12 Months, Unrealized Losses (944) (69)
12 Months or More, Fair Value   2,906
12 Months or More, Unrealized Losses   (40)
Total, Fair Value 47,832 13,288
Total, Unrealized Losses (944) (109)
Mortgage-backed [Member]    
Securities with unrealized loss position    
Less than 12 Months, Fair Value 5,980 4,459
Less than 12 Months, Unrealized Losses (150) (41)
12 Months or More, Fair Value 251 382
12 Months or More, Unrealized Losses (5) (4)
Total, Fair Value 6,231 4,841
Total, Unrealized Losses (155) (45)
Corporate [Member]    
Securities with unrealized loss position    
Less than 12 Months, Fair Value 2,838 4,284
Less than 12 Months, Unrealized Losses (40) (33)
12 Months or More, Fair Value   896
12 Months or More, Unrealized Losses   (6)
Total, Fair Value 2,838 5,180
Total, Unrealized Losses (40) (39)
Foreign debt [Member]    
Securities with unrealized loss position    
Less than 12 Months, Fair Value 4,400 995
Less than 12 Months, Unrealized Losses (114) (5)
Total, Fair Value 4,400 995
Total, Unrealized Losses (114) (5)
Asset-backed securities [Member]    
Securities with unrealized loss position    
12 Months or More, Fair Value 178 270
12 Months or More, Unrealized Losses (4) (4)
Total, Fair Value 178 270
Total, Unrealized Losses $ (4) $ (4)