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Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost $ 289,854 $ 259,726
Available-for-Sale Securities, Gross Unrealized Gains 1,791 2,886
Available-for-Sale Securities, Gross Unrealized Losses (5,295) (1,962)
Available-for-Sale Securities, Fair Value 286,350 260,650
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 607 648
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 1
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 607 649
Obligations of U.S. government corporations and agencies [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 2,519 518
Available-for-Sale Securities, Gross Unrealized Gains 0 0
Available-for-Sale Securities, Gross Unrealized Losses (31) (10)
Available-for-Sale Securities, Fair Value 2,488 508
Mortgage-backed securities - residential [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 69,610 59,942
Available-for-Sale Securities, Gross Unrealized Gains 31 90
Available-for-Sale Securities, Gross Unrealized Losses (2,063) (763)
Available-for-Sale Securities, Fair Value 67,578 59,269
REMICs [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 2,964 1,072
Available-for-Sale Securities, Gross Unrealized Gains 0 0
Available-for-Sale Securities, Gross Unrealized Losses (12) (7)
Available-for-Sale Securities, Fair Value 2,952 1,065
Collateralized mortgage obligations [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 101,272 94,588
Available-for-Sale Securities, Gross Unrealized Gains 28 180
Available-for-Sale Securities, Gross Unrealized Losses (2,371) (892)
Available-for-Sale Securities, Fair Value 98,929 93,876
Preferred stock [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost   0
Available-for-Sale Securities, Gross Unrealized Gains   1
Available-for-Sale Securities, Gross Unrealized Losses   0
Available-for-Sale Securities, Fair Value   1
Corporate bonds [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 12,912 12,914
Available-for-Sale Securities, Gross Unrealized Gains 162 189
Available-for-Sale Securities, Gross Unrealized Losses 0 0
Available-for-Sale Securities, Fair Value 13,074 13,103
Obligations of state and political subdivisions [Member]    
Available-for-sale Securities    
Available-for-Sale Securities, Amortized Cost 100,577 90,692
Available-for-Sale Securities, Gross Unrealized Gains 1,570 2,426
Available-for-Sale Securities, Gross Unrealized Losses (818) (290)
Available-for-Sale Securities, Fair Value 101,329 92,828
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 549 580
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 0
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 549 580
FHLMC certificates [Member]    
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 9 10
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 0
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 9 10
FNMA certificates [Member]    
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 35 41
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 1
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] 35 42
GNMA certificates [Member]    
Held-to-Maturity Securities    
Held-to-Maturity Securities, Amortized Cost [1] 14 17
Held-to-Maturity Securities, Gross Unrealized Gains [1] 0 0
Held-to-Maturity Securities, Gross Unrealized Losses [1] 0 0
Held-to-Maturity Securities, Fair Value [1] $ 14 $ 17
[1] FHLMC, FNMA, and GNMA certificates are residential mortgage-backed securities.