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Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value    
Less than 12 months $ 21,546 $ 7,591
12 months or longer 11,386 11,962
Total 32,932 19,553
Unrealized Losses    
Less than 12 months 233 78
12 months or longer 306 181
Total 539 259
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 9 9
Total 9 9
Municipal obligations    
Fair Value    
Less than 12 months 14,446 3,723
12 months or longer 258 259
Total 14,704 3,982
Unrealized Losses    
Less than 12 months 120 27
12 months or longer 9 7
Total 129 34
Collateralized mortgage obligations - government issued    
Fair Value    
Less than 12 months 4,225 3,868
12 months or longer 4,388 4,677
Total 8,613 8,545
Unrealized Losses    
Less than 12 months 106 51
12 months or longer 126 79
Total 232 130
Collateralized mortgage obligations - government-sponsored enterprises    
Fair Value    
Less than 12 months 2,875 0
12 months or longer 5,241 5,527
Total 8,116 5,527
Unrealized Losses    
Less than 12 months 7 0
12 months or longer 162 86
Total $ 169 $ 86