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Security Types (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	$ 0	$ 3,047
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	31,817	25,983
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	45,009	46,274
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	180,871	168,268
Available-for-sale Securities, Fair Value, Total	257,697	243,572
Available For Sale Securities, Gross Unrealized Gains	2,025	2,391
Available For Sale Securities, Gross Unrealized Losses	2,780	3,512
Available-for-sale Securities, Amortized Cost Basis	258,452	244,693
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	3,047
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	29,253	22,531
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	23,809	19,893
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0	0
Available-for-sale Securities, Fair Value, Total	53,062	45,471
Available For Sale Securities, Gross Unrealized Gains	79	331
Available For Sale Securities, Gross Unrealized Losses	904	973
Available-for-sale Securities, Amortized Cost Basis	53,887	46,113
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	972
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	11,201	16,171
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	121,871	110,644
Available-for-sale Securities, Fair Value, Total	133,072	127,787
Available For Sale Securities, Gross Unrealized Gains	330	551
Available For Sale Securities, Gross Unrealized Losses	1,639	1,805
Available-for-sale Securities, Amortized Cost Basis	134,381	129,041
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	2,564	2,480
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	9,999	10,210
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	59,000	57,624
Available-for-sale Securities, Fair Value, Total	71,563	70,314
Available For Sale Securities, Gross Unrealized Gains	1,616	1,509
Available For Sale Securities, Gross Unrealized Losses	237	734
Available-for-sale Securities, Amortized Cost Basis	$ 70,184	$ 69,539

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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 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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