Securities Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair value    
Less than 12 months $ 22,134 $ 12,122
12 months or longer 0 1,199
Total 22,134 13,321
Unrealized losses    
Less than 12 months 179 89
12 months or longer 0 12
Total 179 101
U.S. Government agency obligations - government-sponsored enterprises    
Fair value    
Less than 12 months 1,000 0
12 months or longer 0 1,000
Total 1,000 1,000
Unrealized losses    
Less than 12 months 5 0
12 months or longer 0 11
Total 5 11
Municipal obligations    
Fair value    
Less than 12 months 9,472 436
12 months or longer 0 199
Total 9,472 635
Unrealized losses    
Less than 12 months 78 4
12 months or longer 0 1
Total 78 5
Collateralized mortgage obligations - government issued    
Fair value    
Less than 12 months 6,980 6,518
12 months or longer 0 0
Total 6,980 6,518
Unrealized losses    
Less than 12 months 38 41
12 months or longer 0 0
Total 38 41
Collateralized mortgage obligations - government-sponsored enterprises    
Fair value    
Less than 12 months 4,682 5,168
12 months or longer 0 0
Total 4,682 5,168
Unrealized losses    
Less than 12 months 58 44
12 months or longer 0 0
Total $ 58 $ 44