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Securities Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair value    
Less than 12 months $ 7,591 $ 22,134
12 months or longer 11,962 0
Total 19,553 22,134
Unrealized losses    
Less than 12 months 78 179
12 months or longer 181 0
Total 259 179
U.S. government agency obligations - government-sponsored enterprises    
Fair value    
Less than 12 months 0 1,000
12 months or longer 1,499 0
Total 1,499 1,000
Unrealized losses    
Less than 12 months 0 5
12 months or longer 9 0
Total 9 5
Municipal obligations    
Fair value    
Less than 12 months 3,723 9,472
12 months or longer 259 0
Total 3,982 9,472
Unrealized losses    
Less than 12 months 27 78
12 months or longer 7 0
Total 34 78
Collateralized mortgage obligations - government issued    
Fair value    
Less than 12 months 3,868 6,980
12 months or longer 4,677 0
Total 8,545 6,980
Unrealized losses    
Less than 12 months 51 38
12 months or longer 79 0
Total 130 38
Collateralized mortgage obligations - government-sponsored enterprises    
Fair value    
Less than 12 months 0 4,682
12 months or longer 5,527 0
Total 5,527 4,682
Unrealized losses    
Less than 12 months 0 58
12 months or longer 86 0
Total $ 86 $ 58