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Security Types (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value $ 4,474 $ 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 27,888 31,817
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 40,360 45,009
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 178,598 180,871
Available-for-sale Securities, Fair Value, Total 251,320 257,697
Available For Sale Securities, Gross Unrealized Gains 834 2,025
Available For Sale Securities, Gross Unrealized Losses 6,763 2,780
Available-for-sale Securities, Amortized Cost Basis 257,249 258,452
US Government and Government Agencies and Authorities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 4,474 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 24,482 29,253
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 22,405 23,809
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 0 0
Available-for-sale Securities, Fair Value, Total 51,361 53,062
Available For Sale Securities, Gross Unrealized Gains 0 79
Available For Sale Securities, Gross Unrealized Losses 1,672 904
Available-for-sale Securities, Amortized Cost Basis 53,033 53,887
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 0 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 0 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 9,617 11,201
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 119,389 121,871
Available-for-sale Securities, Fair Value, Total 129,006 133,072
Available For Sale Securities, Gross Unrealized Gains 80 330
Available For Sale Securities, Gross Unrealized Losses 4,337 1,639
Available-for-sale Securities, Amortized Cost Basis 133,263 134,381
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 0 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 3,406 2,564
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 8,338 9,999
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 59,209 59,000
Available-for-sale Securities, Fair Value, Total 70,953 71,563
Available For Sale Securities, Gross Unrealized Gains 754 1,616
Available For Sale Securities, Gross Unrealized Losses 754 237
Available-for-sale Securities, Amortized Cost Basis $ 70,953 $ 70,184