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Securities (Unrealized Losses Held-to-Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value    
Fair Value Less than 12 months $ 20,023 $ 7,591
Fair Value 12 months or longer 14,914 11,962
Total Fair Value 34,937 19,553
Unrealized Loss Less than 12 months 301 78
Unrealized Loss 12 months or longer 539 181
Total Unrealized Loss 840 259
U.S. government agency obligations - government-sponsored enterprises    
Fair Value    
Fair Value Less than 12 months 0 0
Fair Value 12 months or longer 1,497 1,499
Total Fair Value 1,497 1,499
Unrealized Loss Less than 12 months 0 0
Unrealized Loss 12 months or longer 3 9
Total Unrealized Loss 3 9
Municipal obligations    
Fair Value    
Fair Value Less than 12 months 15,300 3,723
Fair Value 12 months or longer 1,433 259
Total Fair Value 16,733 3,982
Unrealized Loss Less than 12 months 181 27
Unrealized Loss 12 months or longer 48 7
Total Unrealized Loss 229 34
Collateralized mortgage obligations - government issued    
Fair Value    
Fair Value Less than 12 months 0 3,868
Fair Value 12 months or longer 7,448 4,677
Total Fair Value 7,448 8,545
Unrealized Loss Less than 12 months 0 51
Unrealized Loss 12 months or longer 301 79
Total Unrealized Loss 301 130
Collateralized mortgage obligations - government-sponsored enterprises    
Fair Value    
Fair Value Less than 12 months 4,723 0
Fair Value 12 months or longer 4,536 5,527
Total Fair Value 9,259 5,527
Unrealized Loss Less than 12 months 120 0
Unrealized Loss 12 months or longer 187 86
Total Unrealized Loss $ 307 $ 86