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Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 months $ 8,694 $ 22,134
12 months or longer 3,099 0
Total 11,793 22,134
Unrealized Losses    
Less than 12 months 47 179
12 months or longer 36 0
Total 83 179
U.S. Government agency obligations - government-sponsored enterprises    
Fair Value    
Less than 12 months 1,000 1,000
12 months or longer 0 0
Total 1,000 1,000
Unrealized Losses    
Less than 12 months 5 5
12 months or longer 0 0
Total 5 5
Municipal obligations    
Fair Value    
Less than 12 months 1,257 9,472
12 months or longer 261 0
Total 1,518 9,472
Unrealized Losses    
Less than 12 months 8 78
12 months or longer 5 0
Total 13 78
Collateralized mortgage obligations - government issued    
Fair Value    
Less than 12 months 4,177 6,980
12 months or longer 796 0
Total 4,973 6,980
Unrealized Losses    
Less than 12 months 15 38
12 months or longer 12 0
Total 27 38
Collateralized mortgage obligations - government-sponsored enterprises    
Fair Value    
Less than 12 months 2,260 4,682
12 months or longer 2,042 0
Total 4,302 4,682
Unrealized Losses    
Less than 12 months 19 58
12 months or longer 19 0
Total $ 38 $ 58