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Security Types (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	$ 9,453	$ 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	22,836	31,817
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	38,484	45,009
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	172,563	180,871
Available-for-sale Securities, Fair Value, Total	243,336	257,697
Available For Sale Securities, Gross Unrealized Gains	507	2,025
Available For Sale Securities, Gross Unrealized Losses	8,295	2,780
Available-for-sale Securities, Amortized Cost Basis	251,124	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	9,453	0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	19,445	29,253
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	21,591	23,809
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0	0
Available-for-sale Securities, Fair Value, Total	50,489	53,062
Available For Sale Securities, Gross Unrealized Gains	0	79
Available For Sale Securities, Gross Unrealized Losses	1,899	904
Available-for-sale Securities, Amortized Cost Basis	52,388	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	8,893	11,201
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	113,147	121,871
Available-for-sale Securities, Fair Value, Total	122,040	133,072
Available For Sale Securities, Gross Unrealized Gains	46	330
Available For Sale Securities, Gross Unrealized Losses	5,230	1,639
Available-for-sale Securities, Amortized Cost Basis	127,224	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	3,391	2,564
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	8,000	9,999
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	59,416	59,000
Available-for-sale Securities, Fair Value, Total	70,807	71,563
Available For Sale Securities, Gross Unrealized Gains	461	1,616
Available For Sale Securities, Gross Unrealized Losses	1,166	237
Available-for-sale Securities, Amortized Cost Basis	$ 71,512	$ 70,184

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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