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Security Types (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
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	32,447	31,817
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	40,525	45,009
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	186,205	180,871
Available-for-sale Securities, Fair Value, Total	259,177	257,697
Available For Sale Securities, Gross Unrealized Gains	1,026	2,025
Available For Sale Securities, Gross Unrealized Losses	5,948	2,780
Available-for-sale Securities, Amortized Cost Basis	264,099	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	0	0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	29,027	29,253
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	22,654	23,809
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0	0
Available-for-sale Securities, Fair Value, Total	51,681	53,062
Available For Sale Securities, Gross Unrealized Gains	6	79
Available For Sale Securities, Gross Unrealized Losses	1,399	904
Available-for-sale Securities, Amortized Cost Basis	53,074	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	10,356	11,201
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	125,437	121,871
Available-for-sale Securities, Fair Value, Total	135,793	133,072
Available For Sale Securities, Gross Unrealized Gains	137	330
Available For Sale Securities, Gross Unrealized Losses	3,871	1,639
Available-for-sale Securities, Amortized Cost Basis	139,527	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	3,420	2,564
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	7,515	9,999
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	60,768	59,000
Available-for-sale Securities, Fair Value, Total	71,703	71,563
Available For Sale Securities, Gross Unrealized Gains	883	1,616
Available For Sale Securities, Gross Unrealized Losses	678	237
Available-for-sale Securities, Amortized Cost Basis	$ 71,498	$ 70,184

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-Publisher FASB
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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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