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Security Types (Details) - USD ($) $ in Thousands	Sep. 30, 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	31,593	25,983
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	46,753	46,274
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	186,825	168,268
Available-for-sale Securities, Fair Value, Total	265,171	243,572
Available For Sale Securities, Gross Unrealized Gains	2,416	2,391
Available For Sale Securities, Gross Unrealized Losses	2,191	3,512
Available-for-sale Securities, Amortized Cost Basis	264,946	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	29,496	22,531
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	24,009	19,893
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0	0
Available-for-sale Securities, Fair Value, Total	53,505	45,471
Available For Sale Securities, Gross Unrealized Gains	230	331
Available For Sale Securities, Gross Unrealized Losses	654	973
Available-for-sale Securities, Amortized Cost Basis	53,929	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	12,028	16,171
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	127,778	110,644
Available-for-sale Securities, Fair Value, Total	139,806	127,787
Available For Sale Securities, Gross Unrealized Gains	606	551
Available For Sale Securities, Gross Unrealized Losses	1,174	1,805
Available-for-sale Securities, Amortized Cost Basis	140,374	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	2,097	2,480
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	10,716	10,210
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	59,047	57,624
Available-for-sale Securities, Fair Value, Total	71,860	70,314
Available For Sale Securities, Gross Unrealized Gains	1,580	1,509
Available For Sale Securities, Gross Unrealized Losses	363	734
Available-for-sale Securities, Amortized Cost Basis	$ 70,643	$ 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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