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Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 months $ 22,201 $ 7,591
12 months or longer 10,905 11,962
Total 33,106 19,553
Unrealized Losses    
Less than 12 months 314 78
12 months or longer 342 181
Total 656 259
U.S. government agency obligations - government-sponsored enterprises    
Fair Value    
Less than 12 months 0 0
12 months or longer 1,499 1,499
Total 1,499 1,499
Unrealized Losses    
Less than 12 months 0 0
12 months or longer 5 9
Total 5 9
Municipal obligations    
Fair Value    
Less than 12 months 13,308 3,723
12 months or longer 258 259
Total 13,566 3,982
Unrealized Losses    
Less than 12 months 109 27
12 months or longer 8 7
Total 117 34
Collateralized mortgage obligations - government issued    
Fair Value    
Less than 12 months 4,036 3,868
12 months or longer 4,137 4,677
Total 8,173 8,545
Unrealized Losses    
Less than 12 months 131 51
12 months or longer 146 79
Total 277 130
Collateralized mortgage obligations - government-sponsored enterprises    
Fair Value    
Less than 12 months 4,857 0
12 months or longer 5,011 5,527
Total 9,868 5,527
Unrealized Losses    
Less than 12 months 74 0
12 months or longer 183 86
Total $ 257 $ 86